US Pat. No. 9,373,436

LIQUID COOLED INDUCTORS

Hamilton Sundstrand Corpo...

1. An inductor assembly, comprising:
an inductor core defining a cavity;
windings wrapped about the core with a cavity winding portion disposed in the cavity;
a cooling element with a base portion integrally connected to an insert portion, the insert portion being seated within the
cavity;

a cold plate connected to the base portion of the cooling element; and
a gasket seated between the cold plate and the base portion of the cooling element,
wherein the cooling element defines a coolant conduit disposed within the inductor core cavity and adjacent to the cavity
winding portion,

wherein the coolant conduit extends from a first end of the cavity toward an opposed second end of the cavity and includes
an inlet port and an outlet port in fluid communication with each other through the coolant conduit,

wherein the gasket extends about the inlet port or the outlet port of the coolant conduit.

US Pat. No. 9,279,504

PISTON VALVE WITH BUILT IN FILTRATION

Hamilton Sundstrand Corpo...

1. A bypass valve comprising:
a bore including an inlet and an outlet;
a piston movable within the bore for controlling airflow between the inlet and the outlet, the piston including an communication
passage for communicating air from an annular chamber to a second side of the piston, and an inlet passage through a first
side of the piston to the annular chamber surrounding the communication passage, wherein the communication passage is defined
within a central column terminating within the annular chamber, the central column includes a terminal end and the annular
chamber defines an open space around the terminal end of the central column, the terminal end spaced apart from the inlet
to the annular chamber for trapping particles entrained in the airflow; and

an actuator for moving the piston for controlling the airflow between the inlet and the outlet.

US Pat. No. 9,140,138

TURBOMACHINE CONTAINMENT STRUCTURE

Hamilton Sundstrand Corpo...

1. A containment structure, comprising:
an annular wall configured to receive a rotatable portion of a turbomachine; and
a plurality of apertures extending radially through the annular wall, the apertures each extending axially from a circumferentially
smaller area to a circumferentially wider area, wherein an area of a transverse section through the annular wall at a position
axially aligned with the circumferentially smaller areas is greater than an area of a transverse section through the annular
wall at a position axially aligned with the circumferentially wider areas, wherein the annular wall is configured to shear
at an axial location aligned with the plurality of apertures.

US Pat. No. 9,270,168

ELECTROMAGNETIC INTERFERENCE (EMI) REDUCTION IN MULTI-LEVEL POWER CONVERTER

Hamilton Sundstrand Corpo...

1. A controller for providing pulse-width modulation control of a multi-level power converter that synthesizes at least three
direct current (DC) voltages into an alternating current (AC) output voltage, the controller comprising:
a random value generator that generates random values;
a summer that adds the random values generated by the random value generator to a nominal value to define a period of first
and second carrier signals;

a first carrier signal generator that generates the first carrier signal having the period defined by the output of the summer,
wherein the period of the first carrier signal is varied from a nominal period by the addition of the random value provided
by the random value generator to the nominal value;

a second carrier signal generator that generates the second carrier signal having the period defined by the output of the
summer, wherein the period of the second carrier signal is varied from the nominal period by the addition of the random value
provided by the random value generator to the nominal value;

a first comparator that compares the first carrier signal to a reference signal to generate first pulse-width modulation (PWM)
signals used to control a state of a first set of transistors of the multi-level power converter; and

a second comparator that compares the second carrier signal to the reference signal to generate second PWM signals used to
control a state of a second set of transistors of the multi-level power converter.

US Pat. No. 9,391,630

MULTIPLEXED SIGNAL SAMPLER AND CONDITIONER

Hamilton Sundstrand Corpo...

1. A signal convertor, comprising:
a first sensor configured to generate a first signal and a second signal;
first and second multiplexers configured receive the first and second signals, respectively, and generate outputs;
an analog-to-digital (A/D) convertor configured to convert the outputs; and
a processor configured to multiply the outputs by a sine vector and by a cosine vector and determine a magnitude of the first
and second signals based upon the product of the outputs and the sine vector and the product of the outputs and the cosine
vector.

US Pat. No. 9,273,795

REVERSE FLOW RELIEF VALVE

Hamilton Sundstrand Corpo...

1. A reverse flow relief valve comprising:
a housing defined by first, second, third, and fourth fluid inlets, and a first chamber and a second chamber;
a first stationary member located within the second chamber that fits within the second chamber to provide a seal between
the first chamber and the second chamber;

a second stationary member located within the second chamber adjacent to the first stationary member, the second stationary
member having an interior chamber and a passage that places the fourth fluid inlet in fluid communication with the interior
chamber;

a poppet mechanism that includes a ball, stem and poppet member, wherein the ball is located in the first chamber such that
the first inlet is in fluid communication with a first side of the ball and the second inlet is in fluid communication with
a second side of the ball, wherein the ball is actuated axially between a first position and a second position based on the
relative pressures provided at the first inlet and the second inlet, wherein the stem extends through the first stationary
member and the second stationary member and the poppet member forms a seal with the second stationary member when the ball
is in a first position and provides a fluid communication path between the third inlet and the fourth inlet via the interior
chamber of the second stationary member when the ball is in a second position.

US Pat. No. 9,222,415

GAS TURBINE ENGINE FUEL HEATING SYSTEM

Hamilton Sundstrand Corpo...

9. A method of heating fuel in a gas turbine engine, the method comprising:
providing fuel to the gas turbine engine with a fuel pump to sustain a combustion process;
heating a flow of air with exhaust gas from the combustion process by passing the flow of air through a coil disposed in the
exhaust gas;

selectively heating fuel from the fuel pump en route to the gas turbine engine with the flow of air based on a sensed temperature
of the fuel before the fuel enters the fuel pump, wherein the fuel is heated by passing the air flow through a heat exchanger
in thermal communication with the fuel; and

modulating flow of fuel to the heat exchanger using a bypass valve responsive to the sensed temperature of the fuel, the bypass
valve being configured to route the fuel flow from the fuel pump to the heat exchanger when the sensed temperature drops below
a threshold temperature level.

US Pat. No. 9,140,191

SYSTEM FOR CONTROLLING TWO POSITIVE DISPLACEMENT PUMPS

Hamilton Sundstrand Corpo...

1. A fuel system for an aircraft, the fuel system comprising:
a main pump that receives fuel from a source;
a servo pump that receives fuel from the source;
a metering valve that receives main flow from the main pump, wherein the metering valve includes:
a shut-off port;
a shut-off valve that receives fuel flow from the metering valve and is actuated by the shut-off port, wherein the shut-off
port provides:

a low signal pressure to the shut-off valve in a run mode so that the shut-off valve is biased open; and
a high signal pressure to the shut-off valve in a shut-down mode so that the shut-off valve is forced closed;
an actuator that receives fuel flow from the servo pump; and
a pump sharing valve that receives circulating flow from the servo pump and that alternatively directs shared flow to the
main flow or an inlet of the servo pump.

US Pat. No. 9,128,119

ELECTRICAL CIRCUIT TESTING

Hamilton Sundstrand Corpo...

1. An electronics system module, comprising:
a primary electrical circuit including input connectors and output connectors;
a filter circuit connected between the primary electrical circuit and ground; and
a switch element connected between the primary electrical circuit and the ground,
wherein the switch element is configured to be engaged by a test connector to open the switch to disconnect the primary electrical
circuit from the ground,

wherein the test connector includes electrical connectors configured to connect to the input connectors and the output connectors
of the primary electrical circuit,

wherein the test connector is configured to connect a gate of a component of the switch element to the ground to disconnect
the primary electrical circuit from the ground and enable a dielectric test on the primary electrical circuit while the primary
electrical circuit is disconnected from the ground, and

wherein the switch element is configured to automatically close based on the test connector being disengaged from the switch
element.

US Pat. No. 9,414,520

IMMERSION COOLED MOTOR CONTROLLER

Hamilton Sundstrand Corpo...

1. An immersion cooled motor controller assembly comprising:
a) a sealed housing with finned heat sinks are provided on exterior surfaces of the housing;
b) a non-conductive cooling liquid including a fluorocarbon contained in the housing; and
c) a motor controller disposed in the housing and submerged in the non-conductive cooling liquid, the motor controller including:
a power board module configured to operate at power levels that are greater than 30 kW, the power board module including:
a printed wire board;
a bank of closely packed, power semiconductor switches coupled to the printed wire board;
a bank of DC link capacitors mounted to the printed wire board; and
active rectifier gate drive circuitry mounted to the printed wire board and operatively connected to the power semiconductor
switches;

a bank of differential mode inductors adjacent to the printed wire board; and
a bank of common mode inductors adjacent to the printed wire board,
wherein the differential mode inductors and common mode inductors are constructed from 14 AWG wire.

US Pat. No. 9,383,023

HIGH OPENING VELOCITY CHECK VALVE

HAMILTON SUNDSTRAND CORPO...

1. A check valve housing coupled to opposite ends of a hinge bifurcating an aperture defined by a seat, the check valve housing
comprising:
a base displaced from the seat and disposed to extend between the opposite ends of the hinge, the base having opposite sides
which are configured to form linear contact surfaces with check valve flappers pivotably disposed on either side of the base,
respectively, to pivot about the hinge; and

an additional structural member having a continuous body and comprising an arcuate segment extending with a convex arc defined
along a longitudinal axis of the base between the opposite ends of the hinge,

the arcuate segment comprising opposite sides which are configured to form additional contact surfaces with each of the check
valve flappers, respectively, and the check valve flappers being configured to form a lip extending beyond the arcuate segment
of the additional structural member.

US Pat. No. 9,377,052

AIR CYCLE MACHINE WITH BEARING FAILURE DETECTION

HAMILTON SUNDSTRAND CORPO...

1. A bearing monitoring system comprising:
thin foil hydrodynamic bearings;
a flow passage configured to permit a working fluid to pass over at least one surface of the thin foil hydrodynamic bearings;
a first thermocouple located in the flow passage at a first position upstream relative to a segment of the thin foil hydrodynamic
bearings and configured to measure a first temperature of the working fluid;

a second thermocouple located in the flow passage at a second position downstream relative to the segment of the thin foil
hydrodynamic bearings and configured to measure a second temperature of the working fluid; and

a control device in communication with the first thermocouple and the second thermocouple, the control device configured to
(i) compute a temperature gradient across the thin foil hydrodynamic bearings from the first temperature and the second temperature,
(ii) compare the temperature gradient against a known value, and (iii) if the temperature gradient exceeds the known value
the control device is configured to provide an alert.

US Pat. No. 9,365,295

ELECTROMECHANICAL ACTUATOR AND LATCH ASSEMBLY FOR RAM AIR TURBINE

HAMILTON SUNDSTRAND CORPO...

1. A latch assembly for a RAT actuator comprising:
a lock bolt that includes a terminal end with a face;
a lever block having spaced apart first and second lateral walls interconnected to one another by a bridge wall, the first
and second lateral walls providing a pivot axis at one end, the lever block configured to rotate about the pivot axis between
retracted and deployed positions;

a latch pin at another end opposite the one end, the latch pin extending between the first and second lateral walls; and
a latch bearing arranged in each of the first and second lateral walls, each bearing receiving an end of the latch pin and
configured to permit the latch pin to rotate relative to the lever block, the face engaging the latch pin at a lateral location
between the latch bearings, the face configured to slide across the latch pin and roll the latch pin along the face of the
terminal end when the lever block rotates about the pivot axis between the retracted and deployed positions.

US Pat. No. 9,276,401

SOLID STATE CIRCUIT-BREAKER SWITCH DEVICES

Hamilton Sundstrand Corpo...

1. A circuit-breaker switch, comprising:
a first solid state switch configured and adapted to connect to a positive terminal of a high voltage direct current (HVDC)
power source;

a second solid state switch in series with the first solid state switch and configured and adapted to connect to a return
terminal of the HVDC power source; and

a free-wheeling diode connected between the first and second solid state switches and in parallel with a load, wherein the
free-wheeling diode is configured and adapted to limit voltage transients across a load at turn-off conditions,

wherein the free-wheeling diode provides the only pathway between the first and second solid state switches,
wherein the second solid-state switch includes a MOSFET in parallel with an IGBT to reduce overvoltage stress during device
turnoff.

US Pat. No. 9,464,724

CHECK VALVE FLAPPER

HAMILTON SUNDSTRAND CORPO...

1. A check valve flapper for a check valve, comprising:
a flapper body comprising an upper edge, a lower edge, and an arcuate edge between the upper edge and the lower edge, wherein
curvature of the arcuate edge substantially aligns with curvature of a stop of the check valve; and

a hinge portion extending from the flapper body, the hinge portion comprising a lower ear, a middle ear, and an upper ear,
wherein the lower ear, the middle ear, and the upper ear each comprise a hinge pin hole having a hinge pin hole diameter and
an ear outer radius, and a ratio of the hinge pin hole diameter to the ear outer radius is between 0.83 and 0.91, wherein
the lower ear aligns with the lower edge of the flapper body, the upper ear is offset from the upper edge of the flapper body,
a check valve flapper length is defined between the lower edge of the flapper body and the upper edge of the flapper body,
a middle ear offset is defined as a distance from the lower edge of the flapper body to an uppermost edge of the middle ear,
a ratio of the check valve flapper length to the middle ear offset is between 2.08 and 2.11, the lower ear has a lower ear
width, and a ratio of the check valve flapper length to the lower ear width is between 6.72 and 6.90.

US Pat. No. 9,214,276

CAPACITOR

Hamilton Sundstrand Corpo...

1. A capacitor comprising:
an outer shell, having an end surface;
a film capacitor member disposed within the outer shell;
an epoxy layer disposed between the capacitor film member and the outer shell, the epoxy layer having an end portion offset
from the end surface by a predetermined distance;

a conductor member disposed within the outer shell in thermal contact with the film capacitor member;
a collet member slidingly coupled to the conductor member, wherein the collet includes a first opening sized to receive the
conductor member, the collet further having an outer surface with a conical surface;

a washer member disposed between the collet and the film capacitor member, the washer member having a third opening sized
to receive the conductor member, the washer member having a thickness that is smaller than the predetermined distance; and

a sleeve having a second opening sized to receive an end of the conical surface, wherein a portion of the conical surface
opposite the end is larger than the second opening,

wherein the collet member is disposed between the sleeve and the washer member.

US Pat. No. 9,193,474

SIGNAL TRANSMISSION VIA CURRENT MODULATION OF POWER INPUT

HAMILTON SUNDSTRAND CORPO...

1. A system to communicate with a remote component located in an aircraft environment, the system comprising:
the remote component disposed in the aircraft environment configured to control a single phase alternating or direct current
input drawn from a constant voltage power source to generate a current pattern; and

a controller disposed in the aircraft environment configured to monitor the current input to the remote component and determine
a message from the remote component based on the current pattern in the current input and on a stored correspondence between
the current pattern and the message, wherein the remote component controls a current demand to turn on and off in a specified
pattern to generate the current pattern.

US Pat. No. 9,572,219

HUE AND DIMMING CONTROL CIRCUITS FOR LAMPS OR LED ARRAYS

Hamilton Sundstrand Corpo...

1. A lighting system for emitting light of a controlled hue and of a controlled intensity, the lighting system comprising:
a light-emitting diode (LED) that emits light having a hue that varies in response to variations in a voltage applied to the
LED, the emitted light having an intensity that varies in response to variations in a duty-cycle of the voltage applied to
the LED; and

a controller configured to receive a command signal having both AC and DC components that result in the command signal having
a periodic peak voltage and a periodic valley voltage, the peak voltage being indicative of the controlled hue, and a ratio
of the valley voltage to the peak voltage indicative of the controlled intensity, the controller comprising:

a peak detector that detects the peak voltage;
a valley detector that detects the valley voltage; and
a pulse generator that generates a pulse stream having a pulse-voltage magnitude substantially equal to the detected peak
voltage and a pulse-voltage duty cycle substantially equal to the ratio of the detected valley voltage to the detected peak
voltage,

wherein the generated pulse stream is applied to the LED resulting in light emission of the controlled hue and of the controlled
intensity.

US Pat. No. 9,457,908

SELF-COOLED MOTOR DRIVEN COMPRESSOR

HAMILTON SUNDSTRAND CORPO...

1. A nitrogen generation system for an aircraft, comprising:
a RAM air circuit;
a motor driven compressor (MDC) having a rotor, a stator to drive rotor rotation and a compressor rotatably coupled to the
rotor; and

a cooling system to direct cooling air from the RAM air circuit to an inlet of the compressor and an alternative low pressure
environment at an aircraft exterior such that the cooling air removes heat from the stator, the cooling system comprising
a first duct extending from the RAM air circuit to the stator, a second duct extending from the stator to the aircraft exterior,
a third duct extending from the second duct to the inlet and a valve arrangement configured to direct the cooling air from
the second duct to the third duct,

wherein the valve arrangement comprises:
a first valve disposed along the third duct; and
a second valve disposed along the second duct, wherein
the first valve is opened and the second valve is closed when cabin air pressure and a RAM air circuit pressure are equal,
and

the first valve is closed and the second valve is opened when cabin air pressure exceeds a RAM air circuit pressure.

US Pat. No. 9,385,637

BRAKE CONTROLLER

HAMILTON SUNDSTRAND CORPO...

1. A system for controlling a brake coil in a brake, comprising:
a control processor;
a controller in communication with the control processor, the controller comprising a processor and memory with instruction
stored thereon when executed by the processor cause the controller to:

receive signals indicative of threshold current values for the brake coil;
provide enable signals to each of a high-side and low-side driver circuit;
receive signals indicative of a sensed current in the brake coil;
compare the sensed current with the threshold current values; and
provide an adjustment signal if the sensed current is outside a known range for the threshold current values;
wherein the control processor is configured to enable the low side driver circuit with an initial fixed voltage signal followed
by a pulse width modulated signal after a predetermined time period of the initial fixed voltage signal.

US Pat. No. 9,228,593

RAM AIR FAN OUTER HOUSING

Hamilton Sundstrand Corpo...

1. A ram air fan outer housing for directing air from a ram air fan rotor and air from a ram air bypass into a ram air fan
outlet, the outer housing comprising:
an outer cylinder having a ram air fan rotor end and a ram air fan outlet end, the ram air fan rotor end and the ram air fan
outlet end at opposite ends of an axis of the outer cylinder; the outer cylinder including walls having a laminate stacking
sequence of at least four adjacent layers of plain-weave carbon-fiber fabric, each layer of the four adjacent outer cylinder
layers having a weave orientation such that a first outer cylinder layer and a fourth outer cylinder layer are oriented forty-five
degrees from each of a second outer cylinder layer and a third outer cylinder layer, the second outer cylinder layer and the
third outer cylinder layer sandwiched between the first outer cylinder layer and the fourth outer cylinder layer; and

a plenum for directing air from the ram air bypass into the outer cylinder, the plenum including walls having a laminate stacking
sequence of at least eight adjacent plenum layers of plain-weave carbon-fiber fabric, each layer of the eight adjacent layers
having a weave orientation such that a first plenum layer, a fourth plenum layer, a fifth plenum layer, and an eighth plenum
layer are oriented forty-five degrees from each of a second plenum layer, a third plenum layer, a sixth plenum layer, and
a seventh plenum layer; the second plenum layer and the third plenum layer are sandwiched between the first plenum layer and
the fourth plenum layer; the sixth plenum layer and the seventh plenum layer are sandwiched between the fifth plenum layer
and the eighth plenum layer; and the fourth plenum layer and the fifth plenum layer are sandwiched between the third plenum
layer and the sixth plenum layer;

wherein the plenum is joined to the outer cylinder at a joint region, the joint region including a transition section transitioning
the laminate stacking sequence from the eight adjacent layers of the plenum walls to the four adjacent layers of the outer
cylinder walls.

US Pat. No. 9,207,688

AIRCRAFT BLEED SYSTEM AND METHOD OF CONTROLLING AN AIRCRAFT BLEED SYSTEM

Hamilton Sundstrand Corpo...

1. An aircraft bleed system comprising:
a low pressure supply port for delivering a first fluid at a first pressure;
a high pressure supply port for delivering a second fluid at a second pressure, the second pressure greater than the first
pressure; and

a feedback circuit in operable communication with the high pressure supply port for receiving the second fluid, the feedback
circuit comprising:

a first branch configured to route the second fluid to a high pressure control piston for manipulating the high pressure control
piston between a high pressure closed position and a high pressure open position; and

a second branch configured to route the second fluid to a low pressure control piston moveably disposed within the high pressure
control piston for manipulating the low pressure control piston between a low pressure closed position and a low pressure
open position.

US Pat. No. 9,178,400

COOLING ARRANGEMENT FOR A MOTOR ASSEMBLY AND METHOD OF COOLING A MOTOR ASSEMBLY

Hamilton Sundstrand Corpo...

1. A cooling arrangement for a motor assembly comprising:
a motor operably connected to a load;
a motor controller disposed adjacent to, and fluidly coupled to, the motor, the motor controller disposed within a housing
enclosing a cooling fluid for immersion of a plurality of motor controller components;

a duct liner located radially outwardly of an outer surface of the housing and defining an annulus therebetween;
a condenser disposed within the annulus and comprising a plurality of condenser fins extending from the outer surface of the
housing;

a duct arrangement configured to route a cooling flow to a cooling flow inlet disposed at an upstream end of the annulus for
receiving the cooling flow for cooling of the motor controller; and

a cooling flow outlet disposed at a downstream end of the annulus for routing the cooling flow along the motor, the cooling
flow comprises vapor ingested into the duct arrangement.

US Pat. No. 9,169,023

CABIN SUPPLY BRACKET

Hamilton Sundstrand Corpo...

1. A cabin supply bracket for a cabin supply duct assembly, the cabin supply bracket comprising:
a base plate comprising a first, second, and third mounting hole distributed in a substantially triangular arrangement, the
first mounting hole having a centerline defined therethrough; and

a coupling socket extending from the base plate, the coupling socket comprising a first and second tie rod coupling support
having a tie rod coupling hole formed therethrough and a first and second outer edge, the tie rod coupling hold having a centerline
defined therethrough, the first outer edge proximate the second mounting hole, the second outer edge proximate the third mounting
hole, the coupling socket having a socket width defined between a first socket edge proximate the first outer edge and a second
socket edge proximate the second outer edge, wherein a ratio of the socket width to a thickness of the base plate is between
6.31 and 7.84, and a ratio of the socket width to a length defined between the centerline of the first mounting hole and the
centerline of the tie rod coupling hole is between 55.6 and 94.

US Pat. No. 9,488,056

PROPELLER BLADE WITH MODIFIED SPAR LAYUP

RATIER-FIGEAC SAS, Figea...

1. A propeller blade comprising:
a foam core; and
a structural layer formed of multiple layers that surrounds at least a portion of the foam core, the structural layer including
a mid-thickness location defined between the foam core and an outer edge of the structural layer;

wherein the multiple layers include at least one unidirectional layer and at least one biased braid layer disposed asymmetrically
about the mid-thickness location, wherein there are more layers of biased braids layer on one side of the mid-thickness location
than on an other side of the mid-thickness location.

US Pat. No. 9,484,661

ELECTRICAL CONNECTOR PROTECTION

Hamilton Sundstrand Corpo...

1. A fixed electrical connector assembly comprising:
a shell comprising:
a base including at least one opening; and
a plurality of walls extending in a first direction from the base, the base and the plurality of walls defining a shell outer
surface and a shell inner surface, the shell inner surface bounding an inner volume of the shell and having a shell inner
profile;

a plurality of fixed conductors projecting through the opening into the inner volume of the shell; and
a potting container including an outer surface complementing the shell inner profile, a cavity receiving the fixed conductors
through a slot in a base of the potting container, and a potting compound filling the cavity such that the potting compound
completely surrounds the fixed conductors;

wherein the potting compound is substantially removed from all of the plurality of fixed conductors upon removal of the potting
container from the electrical connector assembly.

US Pat. No. 9,455,642

DIGITAL FREQUENCY SELECTIVE TRANSFORMER-RECTIFIER UNIT RIPPLE FAULT DETECTION

Hamilton Sundstrand Corpo...

13. A power system comprising:
an AC variable frequency generator;
a transformer-rectifier unit to convert a generated AC electric power to DC electric power;
a DC bus powering loads;
a tap for sensing the converted DC electric power on said DC bus downstream of said transformer-rectifier unit with a filter,
and said filter passing a filtered signal to a control for detecting a fault on said transformer-rectifier unit by passing
a higher-order harmonic of AC electric power reaching said transformer-rectifier unit as the filtered signal;

a tap for sensing an AC frequency of the generated AC electric power reaching said transformer-rectifier unit, and said sensed
AC frequency being utilized to tune said filter, such that said filter will pass said higher order harmonic, as said higher
order harmonic varies with variation in said AC frequency; and

said filter passes said filtered signal to a control to identify a fault on said transformer-rectifier unit.

US Pat. No. 9,422,053

PASSIVE FAIL SAFE COUPLING MECHANISM

Hamilton Sundstrand Corpo...

1. A ground propulsion assembly for an aircraft, the assembly comprising:
an axle;
a wheel rotatably connected to the axle;
a transmission comprising:
a housing mounted proximate the axle; and
a drive element disposed at least partially outside of the housing;
a power input connected to the housing of the transmission and operatively connected to the drive element;
a mounting bar extending between the axle and the transmission, wherein a first end of the mounting bar is rigidly connected
in an immobile manner to the axle and the transmission is pivotally connected to a second end of the mounting bar;

a disengagement spring disposed between the transmission and the axle, wherein the disengagement spring is configured to urge
the drive element out of engagement with the wheel; and

an actuator operatively connected between the transmission and the axle, wherein the actuator is configured to selectively
generate a force in opposition to the disengagement spring such that the drive element moves relative the wheel and operatively
engages a surface of the wheel to transfer torque to the wheel.

US Pat. No. 9,398,721

COOLING FLUID FLOW PASSAGE MATRIX FOR ELECTRONICS COOLING

Hamilton Sundstrand Corpo...

1. A cooling package for an electronic component comprising:
a supply port communicating with a plurality of outer supply channels, and a return port communicating with a plurality of
outer return channels, said outer supply channels and said outer return channels communicating with distinct ones of openings
in a slot layer and into return and supply slots, respectively;

an orifice layer for supplying fluid to an electronic component to be cooled from said supply slots and for receiving return
fluid after having cooled the electronic component and returning the received fluid into said return slots, and there being
a plurality of supply and return orifices in the orifice layer, with the supply orifices receiving a cooling fluid to be directed
to the electronic component, and the return orifices receiving the return fluid after having cooled the electronic component,
with said supply orifices not receiving the return fluid, and said return orifices not receiving the supply fluid; and

said orifice layer is spaced from the electronic component to be cooled by an impingement channel layer, with the impingement
channel layer having impingement channels communicating with said orifices in said orifice layer, such that fluid flows into
the impingement channels from an orifice associated with a supply slot, flows along the impingement channels to cool the electronic
component and then returns through others of said orifices in the orifice layer associated with said return slots; and

wherein there is a first zone of higher density in said orifice layer, and a second zone of lesser density of said orifices
in said orifice layer.

US Pat. No. 9,381,787

GENERALLY WYE SHAPED ELBOW FOR CABIN AIR FLOW SYSTEM

Hamilton Sundstrand Corpo...

1. An elbow for use in a cabin air supply system for an aircraft comprising:
an inlet duct diverging into two outlet ducts with an interface area between said outlet ducts; said inlet duct having a first
diameter, and said two outlet ducts each having a second diameter;

a nominal wall thickness between said interface area and said outlet ducts, with a central portion of said interface area
having a first thickness at a point of maximum thickness, and said nominal wall thickness being of a second thickness, and
wherein said interface area curving to said central portion of said interface area, and a ratio of said first thickness to
said second thickness being between 3 and 8;

wherein said outlet duct having a second diameter, and a ratio of said second diameter to said first thickness being between
4 and 7;

wherein an outer face of said central portion of said interface area is formed at a first radius of curvature, and a ratio
of said first thickness to said first radius of curvature is between 0.5 and 0.9 ; and

wherein a ratio of said first radius of curvature to radius of curvature on an inner face of said inner face area face is
between 2.4 and 3.4.

US Pat. No. 9,297,266

METHOD OF SEALING COMBUSTOR LINER AND TURBINE NOZZLE INTERFACE

Hamilton Sundstrand Corpo...

1. A method of sealing an interface within a gas turbine engine, comprising:
a) holding a sealing ring arrangement relative to a turbine nozzle using a flange extending from a combustor liner; and
b) urging the sealing ring arrangement toward a sealed relationship with the turbine nozzle, wherein a portion of the turbine
nozzle is axially overlapped at a common axial position with a portion of the flange relative to a rotational axis of the
gas turbine engine, wherein the flange extends from a position axially forward the sealing ring arrangement to a position
axially rearward of the sealing ring arrangement.

US Pat. No. 9,275,970

WIRE BONDS FOR ELECTRONICS

Hamilton Sundstrand Corpo...

1. A circuit element, comprising:
a semiconductor chip;
a wire for connecting between the semiconductor chip and an additional circuit element; and
a plurality of wire bond connections electrically connecting the wire and the semiconductor chip,
wherein the wire is a helical shaped wire that electrically connects to the semiconductor chip through the plurality of wire
bond connections.

US Pat. No. 9,271,423

POWER DISTRIBUTION UNIT AND METHOD OF DISTRIBUTING HIGH DENSITY POWER

HAMILTON SUNDSTRAND CORPO...

1. A power distribution unit comprising:
a first solid state power module comprising a first plurality of solid state power controllers, wherein the first solid state
power module comprises a first set of power characteristics;

a second solid state power module comprising a second plurality of solid state power controllers, wherein the second solid
state power module comprises a second set of power characteristics, wherein the first solid state power module and the second
solid state power module are interchangeably coupled to a first location of a common chassis;

a first side and a second side of the each of the solid state power modules, the first side having at least one first side
mounting component, the second side having at least one second side mounting component, wherein the first and second plurality
of solid state power controllers are configured to mount to the first side and the second side of the solid state power modules;

a plurality of common chassis locations, wherein a plurality of interchangeable solid state power modules are interchangeably
coupled to the plurality of common chassis locations; and

a plurality of remote data concentration modules and a plurality of remote power control modules, wherein the control interface
is configured to control the plurality of remote data concentration modules and the plurality of remote power control modules.

US Pat. No. 9,255,745

HEAT EXCHANGER

Hamilton Sundstrand Corpo...

1. A heat exchanger comprising at least one stackable panel including at least one ligament portion, at least one pin having
an airfoil profile, the at least one ligament portion having a smaller thickness along an axis perpendicular to an airfoil
profile of said pin than a thickness of said at least one pin along an axis perpendicular to said airfoil profile of said
pin.

US Pat. No. 9,168,999

PROPELLER BLADE WITH INTERNAL STIFFENER

Hamilton Sundstrand Corpo...

1. A method of forming a propeller blade comprising:
providing a mold;
forming a foam core in the mold that includes a face side and a camber side;
forming a slot through the foam core that connects the face side and the camber side;
placing an internal stiffener through the slot;
folding the internal stiffener such that it includes a face flange that contacts the face side of the foam core and a camber
flange that contacts the camber side of the foam core; and

forming a structural layer that surrounds the foam core and contacts face and camber flanges;
wherein the internal stiffener is folded after being placed through the slot.

US Pat. No. 9,362,844

METHOD OF DERIVING SWITCH CURRENT SIGNALS IN A RECTIFIER

Hamilton Sundstrand Corpo...

14. A method of deriving synchronous switch current signals for a three-phase Vienna-type active rectifier comprising the
step of:for each phase leg of a three-phase VIENNA-type rectifier:
sensing a line current signal from current applied to the phase leg;
applying the line current signal to a first analog switch, a second analog switch, and a third analog switch;
generating a top gate driver signal, a clamp gate driver signal, and a bottom gate driver signal by pulse width modulation;
deriving a top switch current signal by driving the first analog switch using the top gate driver signal;
deriving a clamp switch current signal by driving the second analog switch using the clamp gate driver signal; and
deriving a bottom switch current signal by driving the third analog switch using the bottom gate driver signal.

US Pat. No. 9,355,782

VERTICALLY MOUNTED CAPACITOR ASSEMBLY

Hamilton Sundstrand Corpo...

1. A capacitor clamping assembly comprising:
a mounting base;
a central strut projecting perpendicularly from the mounting base; and
a plurality of peripheral struts projecting perpendicularly from the base and arranged circumferentially around the central
strut, with a combination of the central portion and the plurality of vertical struts defining a plurality of recesses therebetween
for retaining a corresponding plurality of capacitor elements circumferentially around the central strut in a vertical orientation
and perpendicular to a mounting surface;

wherein the clamping assembly includes a conductive path through the central strut.

US Pat. No. 9,278,759

CABIN AIR COMPRESSOR CROSS-SUPPORT BRACKET

HAMILTON SUNDSTRAND CORPO...

1. A cross-support bracket for a cabin air compressor assembly, the cross-support bracket comprising:
a mating portion comprising a first group of apertures at a first end and a second group of apertures at a second end, wherein
a reference line is defined between a lowermost primary aperture of the first group of apertures and a lowermost primary aperture
of the second group of apertures;

a stiffener portion formed along a lower edge of the mating portion; and
a curved region formed in the mating portion between a first and second upper edge of the mating portion, the curved region
comprising a first curved portion, a substantially straight portion, and a second curved portion, wherein a ratio of a radius
of the first and second curved portions of the curved region to a length from the substantially straight portion to the reference
line is between 9.06 and 10.19, wherein the first group of apertures comprises a first primary aperture being the lowermost
primary aperture of the first group, a second primary aperture proximate a first outer edge and the first upper edge of the
first end, and a third primary aperture proximate the first curved portion of the curved region and the first upper edge of
the first end, and further wherein a ratio of a first length from the first primary aperture to the second primary aperture
relative to a second length from the first primary aperture to the first outer edge is between 0.51 and 0.62, and a ratio
of a third length from first primary aperture to the third primary aperture relative to the second length is between 0.51
and 0.62.

US Pat. No. 9,267,514

BEARING COOLING CONTROL IN AN AIR CYCLE MACHINE

Hamilton Sundstrand Corpo...

1. A cooling tube for an air cycle machine, the cooling tube comprising:
a tube which has a length along a curving central axis and a width along said curving central axis, wherein said central axis
is curved at a radius of 1.3±0.1 cm along an upper portion thereof, and wherein a ratio of the length to width of the tube
is from 1.456-1.657:1.

US Pat. No. 9,261,101

FAN HOUSING FOR RAM AIR FAN

Hamilton Sundstrand Corpo...

1. A fan housing comprising:
a radially outer surface and a pair of radially intermediate features spaced radially inwardly from said radially outer surface,
one of said pair of radially intermediate features including a first inner surface spaced towards a first axial end of said
fan housing, said first inner surface having an inner bore positioned radially outward of an inner bore of a second inner
surface defined by the other of said pair of radially intermediate features, a plurality of vanes extending between said radially
outer surface and an outer periphery of each of said pair of radially intermediate features;

a bearing bore extending radially inwardly of said first surface;
a mounting lug nub formed on an outer periphery of said radially outer surface, a first distance defined between said first
axial end of said housing and an opposed axial end, and a second distance defined between said first axial end and an axial
center of said mounting lug nub, and a ratio of said first distance to said second distance being between 2.13 and 2.11; and

a center of gravity existing for said fan housing, and there being a third distance from said first axial end of said fan
housing to an axial position of said center of gravity, and a ratio of said second distance to said third distance being between
1.07 and 1.00.

US Pat. No. 9,254,924

PRESSURE INFLUENCING ASSEMBLY FOR AN AIRCRAFT AUXILIARY SYSTEM

Hamilton Sundstrand Corpo...

1. A pressure influencing assembly for an aircraft auxiliary system, comprising:
a compressor that provides compressed air for expansion across a turbine;
an inlet opening to the aircraft auxiliary system; and
an exhaust opening from the aircraft auxiliary system, wherein both the inlet opening and the exhaust opening face at least
partially radially away from a rotational axis of the aircraft auxiliary system, both the inlet opening and the exhaust opening
circumferentially spaced from an axially extending crown of a tail cone, wherein the aircraft auxiliary system is positioned
within the tail cone, and the exhaust opening is positioned within a flowpath from the inlet opening, wherein the axially
extending crown extends from a vertical stabilizer to an aftmost end of the tail cone, wherein the inlet opening and the exhaust
opening are circumferentially misaligned about the rotational axis, and wherein at least some of the inlet opening is circumferentially
overlapping with at least some of the exhaust opening relative to the rotational axis.

US Pat. No. 9,249,800

BYPASS DIRECTIONAL CONTROL VALVE

Hamilton Sundstrand Corpo...

1. A bypass directional control valve comprising:
a valve sleeve received in a housing, said housing having an input opening to receive a source of fluid, and said input opening
communicating with two sets of inlet ports formed through said valve sleeve, and into an interior bore of said valve sleeve,
two sets of outlet ports, with one on each of two axial sides of said sets of inlet ports, and extending through said valve
sleeve, with said outlet and said inlet ports all being cylindrical holes, and a diameter of said sets of inlet ports being
greater than a diameter of said sets of outlet ports, said outlet ports communicating to outlet openings in said housing;

a valve spool movable along an axis within said bore of said valve sleeve, said valve spool having a land associated with
each of said sets of said inlet ports, and a spring biasing said valve spool in a first direction such that a first land blocks
a first of said sets of outlet ports, and a second land is spaced from a second of said sets of outlet ports, with a pressure
tap to receive a pressure control signal to cause said valve spool to selectively move against the force of said spring such
that said second land may block said second set of outlet ports and said first land opens said first set of outlet ports;

said valve sleeve extends for a first axial distance between opposed ends, and a first of said sets of said inlet ports is
spaced from said end by a second distance, and a ratio of said first distance to said second distance is between 3.600 and
3.615;

said outlet ports in said two sets of outlet ports are circumferentially aligned, and said inlet ports in said two sets of
inlet ports are circumferentially staggered between the two sets; and

said valve spool extends for a first length, and a second length defined between an end of said valve spool which receives
said spring, and an end of said first land which is closest to said spring, with a ratio of said first length to said second
length being between 3.818 and 3.864;

said first and second lands have edge breaks at an edge, and said lands have a nominal outer diameter, with an edge break
outer diameter defined to a beginning of the edge break on said lands, and a ratio of said edge break outer diameter to said
nominal outer diameter being between 0.995 and 1.000.

US Pat. No. 9,200,593

ENERGY ABSORBING FAN BLADE SPACER

HAMILTON SUNDSTRAND CORPO...

2. A gas turbine engine fan section comprising:
a hub having a flange with an aperture;
circumferentially spaced fan blades supported on the hub; anda spacer arranged between adjacent fan blades and operatively supported by the hub, the spacer configured to be collapsible
in response to a fan blade load exerted on the spacer in excess of a threshold load, the spacer generally rigid at fan blade
loads below the threshold load, wherein the spacer includes a base with an opening, and a fastener extends through the aperture
and the opening to secure the spacer to the hub, wherein the spacer includes a wall providing a frangible connection, the
frangible connection configured to fracture in response to the fan blade load.

US Pat. No. 9,193,472

ELECTROMECHANICAL ACTUATOR LUBRICATION SYSTEM FOR RAM AIR TURBINE

HAMILTON SUNDSTRAND CORPO...

1. An actuator for a ram air turbine comprising:
a housing supporting a piston rod arranged in a cylinder, the piston rod and the cylinder slideably moveable relative to one
another between retracted and deployed positions; and

a can surrounds the cylinder and is loosely and non-rigidly supported relative to the housing, the can permitted to pivot
relative to the housing and relative to the cylinder in a radial direction during operation.

US Pat. No. 9,187,180

THERMAL PNEUMATIC DEICING SYSTEM FOR AN AIRCRAFT RAM AIR HEAT EXCHANGER

Hamilton Sundstrand Corpo...

1. A thermal pneumatic deicing system for deicing a RAM air heat exchanger comprising:
an environmental control system (ECS) including a RAM air heat exchanger and an outlet;
an electronics housing including a plurality of electronic components;
a deicing duct fluidically connecting the RAM air heat exchanger and the electronics housing, the duct deicing including a
valve; and

a controller operatively connected to the valve, the controller being configured and disposed to selectively fluidically connect
the RAM air heat exchanger and the electronics housing to facilitate deicing of the heat exchanger.

US Pat. No. 9,188,136

FAN ROTOR WITH COOLING HOLES

Hamilton Sundstrand Corpo...

1. A cooling flow system for a motor and bearings of a ram air fan, the system comprising:
an inner cooling area housing the motor, bearings and tie rod to intake air; and
a rotor connected to the tie rod and comprising:
a pilot to connect to the tie rod for rotating the rotor;
a circular flat monolithic disc portion extending around the pilot, the disc with a plurality of large circular holes located
around an outer edge of the circular disc portion to control the flow of air cooling the motor and a plurality of small circular
holes located around the pilot to control the flow of air cooling the bearings, wherein the plurality of large circular holes
comprises 18 cooling holes equally spaced around the center of the disc, and wherein the plurality of small circular holes
comprises 11 cooling holes equally spaced around the center of the disc;

a hub connecting to the outer edge of the circular disc portion; and
a plurality of blades attached around the hub.

US Pat. No. 9,092,029

VEHICLE MONITORING SYSTEM

Hamilton Sundstrand Corpo...

1. A reconfigurable vehicle monitoring arrangement comprising:
an aircraft structure;
a housing securable relative to the aircraft structure;
a communication base at least partially disposed within the housing; andat least one universal connector assembly configured to selectively operatively connect the communication base with a plurality
of different modules, at least one of the modules configured to communicate data gathered from a plurality of aircraft data
sources through the at least one universal connector assembly to the communication base, wherein the plurality of different
modules comprises a first module operatively connected to a first sensor group that monitors temperatures of a gas turbine
engine and a second module operatively connected to a second sensor group that monitors vibrations of a gas turbine engine.

US Pat. No. 9,395,701

ACTIVE DEAD BAND FOR NOISE REDUCTION IN HIGH RESPONSE HIGH BANDWIDTH CONTROL SYSTEMS

HAMILTON SUNDSTRAND CORPO...

1. A control system, comprising:
an active dead band, coupled to a feedback path of the control system, configured to:
receive a first signal derived from a motor position signal of the feedback path of the control system; and
utilize, in accordance with the signal, a set of thresholds to prevent feedback noise within a driveline of the control system,
wherein the active dead band is coupled to an error loop of the feedback path, and
wherein the first signal is a speed error signal based on a computation between a speed feedback signal and a speed command
signal.

US Pat. No. 9,297,446

ELECTRO-MECHANICAL ACTUATORS WITH INTEGRATED HIGH RESOLUTION WIDE OPERATING LOAD RANGE

Hamilton Sundstrand Corpo...

1. An electro-mechanical actuator with wide operating range load, comprising:
a screw shaft;
a speed summed differential coupled to rotate the screw shaft;
a prime mover coupled to the speed summed differential and configured to drive an output torque of the screw shaft;
a torsional spring coupled to the speed summed differential by way of a rotary position sensor for detecting the rotation
of the screw shaft thereby measuring the output torque of the screw shaft for control of the prime mover; and

a controller connected to the rotary position sensor to detect the rotation of the torsional spring to determine the actuator's
output load.

US Pat. No. 9,274,149

FREQUENCY PHASE DETECTION THREE PHASE SYSTEM

HAMILTON SUNDSTRAND CORPO...

1. An apparatus comprising:
a device configured to monitor operation of a three phase system, the device including:
a circuit that maximizes a signal-to-noise ratio of a measurement associated with the monitoring, the circuit including a
filter configured to retain a fundamental frequency of the three phase system and remove other frequencies; and

a monitor to generate a message that provides a status of the three phase system based on an output of the circuit, wherein
the circuit is configured to generate three vectors, each vector corresponding to a difference of two of the three phases
of the three phase system or the magnitude of each phase relative to a common reference, and a first gain associated with
two of the three vectors is the same, and a second gain associated with a third of the three vectors is different from the
first gain or a combination of gains which results in a rotating vector.

US Pat. No. 9,267,439

HIGH ALTITUDE START OF A GAS TURBINE ENGINE USING FUEL PULSING AND STARTER TOGGLING

Hamilton Sundstrand Corpo...

1. A system for starting a gas turbine engine, the system comprising:
an engine controller for controlling speed of the engine, wherein the engine controller is configured to vary the speed of
the engine between a minimum speed value and a maximum speed value for at least two cycles during lighting of the engine,
and wherein each of the at least two cycles of varying the speed of the engine includes toggling a starter motor on such that
the speed of the engine accelerates to the maximum speed value, and toggling the starter motor off such that the speed of
the engine decelerates to the minimum speed value, until light-off of the gas turbine engine has occurred;

a fuel controller for controlling delivery of fuel to a combustor of the engine, wherein the fuel controller is configured
to vary the delivery of fuel to the combustor of the engine between a minimum fuel value and a maximum fuel value during the
lighting of the engine, and wherein varying the delivery of fuel occurs concurrently with the at least two cycles of varying
the speed of the gas turbine engine; and

temperature sensors for monitoring a temperature of an exhaust of the gas turbine engine to determine when the light-off of
the gas turbine engine has occurred;

wherein the engine controller is further configured to accelerate the engine to a self-sustaining speed upon determining the
light-off of the gas turbine engine has occurred.

US Pat. No. 9,257,886

ROTATING RECTIFIER ASSEMBLY BUS BAR

HAMILTON SUNDSTRAND CORPO...

1. A rectifier assembly comprising:
a diode pack;
a bus bar including a first layer electrically connected to the diode pack, the first layer having a first yield strength
and a first coefficient of thermal expansion, and a second layer of copper joined to and in engagement with the first layer
along a length and including second yield strength less than the first yield strength, wherein the first layer is beryllium
copper, wherein the second layer is either brazed or adhered to the first layer, wherein the second layer is secured to one
side of the first layer, wherein the second layer surrounds a perimeter of the first layer.

US Pat. No. 9,238,972

RAM AIR TURBINE PUMP LEAKAGE CONTROL

Hamilton Sundstrand Corpo...

1. A ram air turbine drivetrain assembly comprising:
a strut movable between a deployed position and a stowed position,
a turbine supported by the strut and connected to a turbine shaft;
a housing containing a hydraulic pump and a generator; and
a drive shaft that rotates about a drive shaft axis to directly drive the hydraulic pump and the generator when the drive
shaft is in the deployed position, the drive shaft axis transverse to a rotational axis of the turbine shaft, the drive shaft
having an interruption that redirects a fluid flowing from the hydraulic pump to the generator when the drive shaft is rotated
about the drive shaft axis into an annular cavity provided by the housing, the drive shaft supported in the strut, wherein
the drive shaft, the hydraulic pump, and the generator are axially aligned.

US Pat. No. 9,209,222

SURVEILLANCE DEVICE

Hamilton Sundstrand Corpo...

1. A surveillance device comprising:
a circuit card assembly disposed in a housing;
a lens/imager disposed in a center portion of the circuit card assembly;
a plurality of light emitting diodes circumferentially disposed around the lens/imager on the circuit card assembly, each
of the plurality of light emitting diodes configured to emit a narrow beam of light;

a diffuser disposed in a second housing, the diffuser configured to spread the narrow beams of light; and
a Fresnel lens disposed in the second housing, the Fresnel lens configured to spread and redirect the light emitted from the
diffuser, the Fresnel lens comprises a center window having a diameter at least as wide as the lens/imager and a perimeter
portion comprising a plurality of concentric annular sections,

wherein the Fresnel lens is constructed of a material opaque to visible light and transparent to infrared light to conceal
an interior of the surveillance device.

US Pat. No. 9,723,753

PLANAR HEAT CUP WITH CONFINED RESERVOIR FOR ELECTRONIC POWER COMPONENT

Hamilton Sundstrand Corpo...

1. An electric system comprising:
an electronic component received within a cup shaped heat pipe, a wall of said heat pipe in contact with a cold plate;
the heat pipe defined by an inner wall and an outer wall with an intermediate fluid chamber, said heat pipe extending away
from said cold plate to define a cup shape, with a fluid movement member positioned within the chamber to move the fluid from
an end of said chamber adjacent to the cold plate to a spaced end of said cup shape; and

wherein said component is a toroidal inductor.

US Pat. No. 9,391,059

SOLID-STATE POWER CONTROLLER CHANNEL PROTECTION SYSTEMS AND METHODS

HAMILTON SUNDSTRAND CORPO...

1. A scalable solid-state power controller system comprising:
a power source comprising a channel bank comprising a plurality of output channels comprising a first output channel and a
second output channel;

a first solid-state power controller comprising:
a first channel current switching circuit;
an output feedback circuit; and
a control circuit comprising an overvoltage protector and a control circuit/feedback circuit balancer, wherein the control
circuit/feedback circuit balancer comprises a feedback resistor connected in parallel with a control resistor, the feedback
resistor and the control resistor being connected in series with the overvoltage protector:

a second solid-state power controller comprising a second channel current switching circuit;
a controller in electrical communication with the first solid-state power controller via the control resistor and the second
solid-state power controller; and

a combined channel output,
wherein the first channel current switching circuit is disposed in series between the combined channel output and the first
output channel,

wherein the second channel current switching circuit is disposed in series between the combined channel output and the second
output channel,

wherein the first channel current switching circuit controls a first current supplied by e first output channel in response
to the controller, and

wherein the second channel current switching circuit controls a second current supplied by the second output channel in response
to the controller.

US Pat. No. 9,386,712

HIGH-TEMPERATURE ENVIRONMENT ELECTRONIC CHASSIS

HAMILTON SUNDSTRAND CORPO...

1. An electrical system for use in a high-temperature environment, comprising:
a housing;
a substrate disposed in the housing formed of a substrate material, the substrate material having a low thermal conductivity,
the substrate material being one or: a polyaryletherketone; and a material containing aluminum oxide and fused silica;

a plurality of electrical components disposed on the substrate; and
a reflective layer disposed on at least a portion of an outer surface of the housing.

US Pat. No. 9,267,512

RAM AIR FAN DIFFUSER WITH PERFORATED SIDE WALLS

Hamilton Sundstrand Corpo...

1. A ram air fan diffuser for a ram air fan assembly, the diffuser comprising:
a perforated cone having a frustoconical shape symmetrical about an axis of the diffuser with a plurality of perforations
between a first end and a second end of the perforated cone;

an inlet ring seal attached to and axially disposed about the first end of the perforated cone; and
an outlet ring seal attached to and axially disposed about the second end of the perforated cone, wherein the outlet ring
seal comprises a cylindrical exterior surface symmetrical about the axis of the diffuser, an o-ring channel within the cylindrical
exterior surface, and a diffuser rim extending radially beyond the second end of the perforated cone and radially outward
in a plane perpendicular from the axis of the diffuser;

wherein an average external diameter of the second end of the perforated cone is greater than an average external diameter
of the first end of the perforated cone such that the perforated cone extends away from the inlet ring seal and radially outward
from the axis of the diffuser.

US Pat. No. 9,194,291

TURBOMACHINE WINDMILL BYPASS VALVE

Hamilton Sundstrand Corpo...

1. A turbomachine comprising:
a combustor;
a bypass valve having a sleeve and a spool,
the sleeve providing a bore that extends along an axis, the sleeve having at least one window, and
the spool received within the bore, the spool configured to move back and forth within the bore between a first position that
restricts flow through at least one window and a second position that permits flow through the at least one window of the
sleeve, wherein an outer diameter of the spool is from 99.90 to 99.95 percent of a diameter of the bore,

wherein the flow moves to the combustor of the turbomachine when the spool is in the first position within the bore.

US Pat. No. 9,086,035

INTEGRATED THRUST REVERSER ACTUATOR AND VARIABLE AREA FAN NOZZLE ACTUATOR

Hamilton Sundstrand Corpo...

1. An actuator system comprising:
a ballscrew shaft;
a first ballnut engaged with the ballscrew shaft;
a second ballnut engaged with the ballscrew shaft and attached to a first translatable object, the second ballnut being separated
from the first ballnut by a distance;

a bearing fixed to the ballscrew shaft between the first ballnut and the second ballnut and coupled to a second translatable
object;

a drive mechanism operably coupled to the first ballnut that rotates the first ballnut; and
a locking mechanism configured to selectively couple the ballscrew shaft to the first ball nut, wherein operation of the locking
mechanism adjusts a position of the first translatable object and the second translatable object independently.

US Pat. No. 9,394,984

THREE POINT HARMONIC DRIVE

HAMILTON SUNDSTRAND CORPO...

1. A harmonic drive, comprising:
a toothed harmonic ring gear;
a harmonic wave generator comprising a rotor element, including an outer wave profile having at least three lobes, and a stator
element configured to drive rotation of the rotor element, wherein the rotor element comprises: an annular base member including
the wave profile; and an annular array of permanent magnetic materials coupled to an inner diameter of the annular base member;
and

a harmonic flex spine radially interposed between the harmonic ring gear and the rotor element and comprising a toothed portion
and a bearing element rotatably supportive of the rotor element within the toothed portion,

the toothed portion being disposed to register with the toothed harmonic ring gear at contact points corresponding to said
lobes defined by the wave profile in accordance with the rotation of the rotor element.

US Pat. No. 9,328,764

FASTENING SYSTEM INCLUDING REMOVABLE STUD AND RETAINING PLATE

Hamilton Sundstrand Corpo...

1. A fastening system comprising:
a first housing of a line replaceable component, the first housing of the line replaceable component comprising a bore having
a depth;

a removable stud comprising:
a threaded portion configured to be removably threaded into a threaded bore of a second housing;
a shank portion arranged coaxially with the threaded portion and configured to be inserted through the bore of the first housing
of the line replaceable component; and

an anti-rotation portion disposed between the threaded portion and the shank portion and abutting threads of the threaded
portion, the anti-rotation portion having a first thickness,

wherein the shank portion further comprises an unthreaded portion coaxially arranged with the anti-rotation portion and a
threaded portion coaxially arranged with the unthreaded portion; and

a retaining plate configured to be mounted between the second housing and the first housing of the line replaceable component,
the retaining plate having a second thickness that is greater than the first thickness of the anti-rotation portion and comprising
a mating hole configured to mate with the anti-rotation portion of the removable stud,

wherein the unthreaded portion of the shank portion of the removable stud has a length that is greater than or equal to a
sum of the second thickness and the depth of the bore of the first housing of the line replaceable component less the first
thickness.

US Pat. No. 9,299,473

COMPOSITE ELECTRICALLY CONDUCTIVE STRUCTURES

HAMILTON SUNDSTRAND CORPO...

1. An electrically conductive structure, comprising:
a substrate arranged in a plurality of strands and formed from a substrate material and at least one graphene layer coated
circumferentially on one or more of the strands of the plurality of strands, the graphene layer being a single atom-thick
layer of carbon atoms arranged in a hexagonal pattern, the substrate and the at least one graphene layer having an axial direction;

wherein a first cross-section taken along the axial direction of the substrate and the at least one graphene layer includes:
a plurality of layers of the substrate material; and
at least one internal layer of the graphene alternatingly disposed between the plurality of layers of the substrate material.

US Pat. No. 9,194,433

CAGE BEARING WITH OIL RETAINING SHIELD

Hamilton Sundstrand Corpo...

1. A bearing system comprising:
an inner race comprising at least one bearing oil channel coupled to an outer race comprising no bearing oil channel, wherein
the inner race and outer race define a lubrication volume; and

a shield comprising a first shield component coupled to the outer race by a retaining ring, and extending from the outer race
toward the inner race, wherein the first shield component at least partially defines an aperture of the lubrication volume;
and

a seal extending from the outer race toward the inner race and disposed over a surface of the shield component and over the
aperture.

US Pat. No. 9,394,831

TURBOMACHINE DRIVE ARRANGEMENT

Hamilton Sundstrand Corpo...

1. A hydraulic log valve assembly, comprising:
a valve that controls a flow of fluid within a hydraulic log to provide a rotational output from the hydraulic log that is
different than a rotational input to the hydraulic log, the hydraulic log including a first wobbler plate to adjust a stroke
of a first plurality of pistons, and a second wobbler plate to adjust a stroke of a second plurality of pistons, at least
one of the first wobbler plate and the second wobbler plate adjustable from a first position where a portion of the first
wobbler plate or second wobbler plate is tilted to a first side of a radial axis and a second position where the portion is
tilted to an opposite second side of the radial axis, wherein the valve adjusts to control the flow of fluid between a higher
pressure area of the hydraulic log and a lower pressure area of the hydraulic log, the first wobbler plate and the second
wobbler plate adjusted independently from the valve; and

a port plate, the first wobbler plate disposed on a first side of the port plate, the second wobbler plate disposed on an
opposing second side of the port plate, the port plate having a first opening to permit flow from the first side to the second
side, and a second opening to permit flow from the second side to the first side,

wherein the first opening is in a higher pressure area of the hydraulic log and the second opening is in a lower pressure
area of the hydraulic log,

wherein the valve selectively permits flow from the higher pressure area to the lower pressure area.

US Pat. No. 9,355,791

DISCRETE INPUT CIRCUIT

HAMILTON SUNDSTRAND CORPO...

1. A discrete input circuit comprising:
a switch;
a capacitor coupled to the switch;
a first resistor connected in series with the capacitor and coupled to a power supply; and
a second resistor coupled to the power supply and the switch, the second resistor is connected in parallel with the first
resistor and the capacitor,

wherein a value of the capacitor and a value of the first resistor are selected to provide a wetting current from the power
supply to the switch when the switch is closed in order to clean contacts associated with the switch, the switch is coupled
to a ground.

US Pat. No. 9,207,271

TEST METHOD FOR SENSE CIRCUIT

Hamilton Sundstrand Corpo...

1. A method comprising:
coupling a first transformer to a first load;
coupling a second transformer to a second load;
applying a single phase power source to the first transformer;
applying an inverted version of the power source to the second transformer;
coupling a sensing circuit to the first and second transformers; and
monitoring, by the sensing circuit, signal contributions associated with the first and second transformers.

US Pat. No. 9,110,475

INTEGRAL FILTER AND REGULATOR FOR VALVE

Hamilton Sundstrand Corpo...

1. A valve assembly comprising:
a closure element disposed in a flow control duct;
a fluid-driven actuator assembly including a first piston disposed between a first pressure chamber and a second pressure
chamber, and a shaft linked to the first piston, the shaft operable to translate linear movement of the first piston into
rotation of the closure element;

an actuator fluid supply passage extending between the flow control duct and the first pressure chamber; and
an integral filter and pressure regulator unit disposed in line with the actuator fluid supply passage, the integral filter
and pressure regulator unit including a regulator housing having at least one cylindrical wall surrounding a vent cavity and
a regulator cavity, and filter media secured to the regulator housing and disposed across a regulator orifice in communication
with the regulator cavity;

wherein the regulator orifice is formed through an axial wall of the regulator housing adjacent the regulator cavity.

US Pat. No. 9,088,230

DUAL GENERATOR SYSTEM

Hamilton Sundstrand Corpo...

1. A dual generator system comprising:
a main generator that generates at least a first phase main output and a second phase main output;
a flux regulated permanent magnet generator (FRPMG) that generates at least a first phase auxiliary output and a second phase
auxiliary output, wherein the first phase main output is combined with the first phase auxiliary output to generate a first
phase combined output and the second phase main output is combined with the second phase auxiliary output to generate a second
phase combined output, and wherein the FRPMG includes at least a first control winding and a second control winding and provides
a first flux diverter control signal to the first control winding to regulate the first phase auxiliary output and provides
a second flux diverter control signal to the second control winding to regulate the second phase auxiliary output; and

an auxiliary generator control unit (AGCU) comprising:
a first control loop that includes an outer control loop that compares the first phase combined output with a first phase
reference value to generate a first flux diverter command signal and an inner loop that compares the first flux diverter command
signal with the first flux diverter control signal and generates in response control signals to regulate the first flux diverter
control signal to increase or decrease the first phase combined output; and

a second control loop that monitors the second phase combined output and in response regulates the second flux diverter control
signal to increase or decrease the second phase combined output.

US Pat. No. 9,068,861

RESOLVER INTERFACE

Hamilton Sundstrand Corpo...

1. A resolver comprising:
an excitation coil that receives an excitation signal;
a first secondary coil that generates a first signal in response to the excitation signal in the excitation coil;
a second secondary coil perpendicular to the first secondary coil, wherein the second secondary coil generates a second signal
in response to the excitation signal in the excitation coil;

a sampling circuit comprising:
a multiplexer that samples at least one period of the excitation signal, the first signal, and the second signal, individually,
each of the first and second signals sampled subsequent to the sampling of the excitation signal, and outputs a multiplexed
analog signal based on the excitation signal, the first signal, and the second signal;

a filter that filters the multiplexed analog signal provided by the multiplexer and outputs a filtered multiplexed analog
signal; and

an analog-to-digital converter that converts the filtered multiplexed analog signal to a digital signal; and
a controller configured to receive the digital signal from the analog-to-digital converter and to calculate a sign of the
first signal and the second signal relative to the excitation signal, wherein the controller determines the sign of the first
signal by comparing a determined peak of the sampled first signal to a sample of the first signal 180° out of phase with the
determined peak of the sampled first signal, wherein if the determined peak is greater than the out of phase sample the sign
is positive, wherein if the determined peak is less than the out of phase sample the sign is negative, and wherein based on
the calculated sign of the first signal and the second signal the controller determines a quadrant of the excitation coil
and based on the determined quadrant and magnitudes of the sampled first signal and second signal calculates a position of
the excitation coil.

US Pat. No. 9,067,163

PARTICLE SEPARATOR

Hamilton Sundstrand Corpo...

1. A particle separator, comprising:
a vessel, which is receptive of a fluid flow and configured to output the fluid flow at first and second outlets, the vessel
including a curved, inwardly facing surface that has a major longitudinal axis and defines an interior extending with a substantially
uniform interior width along the major longitudinal axis; and

a scupper disposed within the vessel to extend along an entire axial length of the vessel to define:
a first flowpath along which the received fluid flow is directed to flow toward the first outlet between the curved, inwardly
facing surface and a first side of the scupper, and

a second flowpath along which the received fluid flow is directed to flow toward the second outlet along a second side of
the scupper, which is opposite the first side.

US Pat. No. 9,382,841

AIRCRAFT ENVIRONMENTAL CONTROL SYSTEM SELECTIVELY POWERED BY THREE BLEED PORTS

HAMILTON SUNDSTRAND CORPO...

1. A bleed air supply system configured to supply bleed air from an engine to an environmental control system (ECS) pack,
comprising:
a high pressure port configured to bleed air from a high spool of the engine;
an intermediate pressure port configured to bleed air from the high spool of the engine, the bleed air at the intermediate
pressure port having a pressure less than the bleed air at the high pressure port;

a precooler, coupled to the ECS pack and fluidly coupled to the high pressure port and the intermediate pressure port, such
that bleed air from the high pressure port and the intermediate pressure port is conditioned in the precooler before being
provided to the ECS pack; and

a low pressure port configured to bleed air from either a low spool of the engine or from between the low spool and the high
spool, wherein bleed air from the low pressure port bypasses the precooler and is supplied directly to the ECS pack;

a first valve at the high pressure port, a second valve at the intermediate pressure port, and a third valve at the low pressure
port of the bleed air supply system; and

a controller operably coupled to the first valve, the second valve, and the third valve, the controller being configured to
move each of the first valve, the second valve and the third valve between an open position and a closed position to control
a respective flow of bleed air at each of the high pressure port, the intermediate pressure port, and the low pressure port,
respectively, wherein the controller is configured to operate both the second valve and the third valve when a temperature
of the bleed air from the low pressure port exceeds a predefined threshold.

US Pat. No. 9,353,848

SPLINE LUBRICATION SYSTEM

Hamilton Sundstrand Corpo...

9. A method comprising:
rotating first and second shafts interconnected by splines and mounted to a gearbox;
collecting lubricating liquid in a scupper positioned on an inner surface of the gearbox;
flowing lubricating liquid from the scupper through the first shaft to the splines when the first and second shafts stop rotating,
wherein the lubricating liquid flows from the scupper through entry holes positioned circumferentially around the first shaft;
and

flowing lubricating liquid from the entry holes across an annular dam to the splines via an oil catch pan.

US Pat. No. 9,306,432

STATOR COOLING CHANNEL TOLERANT TO LOCALIZED BLOCKAGE

HAMILTON SUNDSTRAND CORPO...

1. A flow mixer ring for use in a motor comprising:
a generally circular body constructed from a thermally conductive material;
a plurality of fins arranged about a circumference of and projecting inwardly from an inner surface of the body, the plurality
of fins being arranged adjacent only a first end of the circular body;

a plurality of cooling channels defined between the plurality of fins; wherein an inner diameter defined by the plurality
of fins is substantially equal to a diameter of an adjacent component of the motor, the plurality of fins are stationary and
are configured to block an airflow through at least one cooling channel of an adjacent stator core when installed in the motor.

US Pat. No. 9,270,113

POWER DISTRIBUTION CABINET

Hamilton Sundstrand Corpo...

1. A power supply module included in a power distribution cabinet of a vehicle that distributes power from a plurality of
power sources to a plurality of internal cabinet modules, the power supply module comprising:
a plurality of input terminals, each input terminal connected to a different one of the plurality of power sources, wherein
availability of each of the plurality of power sources varies during operation of the vehicle; and

a plurality of output terminals each connected to one or more of the plurality of input terminals to provide an output that
represents a unique combination of selected power sources.

US Pat. No. 9,220,184

ADVANCED COOLING FOR POWER MODULE SWITCHES

Hamilton Sundstrand Corpo...

1. A system comprising:
an electronic device;
a heat spreader with a vapor chamber attached to a bottom end of the electronic device, so that heat flows from the electronic
device to the heat spreader, wherein the heat spreader comprises:

a conductivity layer held at a top end of the heat spreader;
a frame attached to a bottom side of the conductivity layer; and
a vapor chamber in the frame that contains a working fluid that is capable of phase-change heat transfer; and
a heat sink with microchannels running through it attached to a bottom end of the heat spreader, so that heat from the heat
spreader flows to the heat sink, wherein the microchannels contain a working fluid that is capable of phase-change heat transfer.

US Pat. No. 9,473,028

SYSTEMS AND METHODS FOR CONTROLLING POWER CONVERTERS

Hamilton Sundstrand Corpo...

9. A power converter, comprising:
an inductor connected to an input lead and an output lead, wherein the inductor is configured to receive a first direct current
(DC) voltage level through input lead and apply a lower output DC voltage to the output lead;

an internal overvoltage detection module electrically communicative with the output lead and operatively associated with a
top magnetizing MOSFET, wherein top magnetizing MOSFET is connected to the input lead; and

an external overvoltage detection module electrically communicative with the output lead and operatively associated with a
power disconnect MOSFET, wherein the power disconnect MOSFET is connected in series with the top magnetizing MOSFET,

wherein the external over-voltage detection module has a first overvoltage protection threshold that is less than a second
overvoltage protection threshold of the internal over-voltage detection module to disconnect the top magnetizing MOSFET from
a voltage source prior to a DC voltage in excess of the second voltage threshold being applied to the output lead.

US Pat. No. 9,416,880

ROTARY METERING VALVE ASSEMBLY AND METHOD OF MODIFYING CONTACT SURFACE FOR REDUCING GAUGE WRINGING

HAMILTON SUNDSTRAND CORPO...

1. A rotary metering valve assembly comprising:
a stationary body plate having a first contact surface and a metering orifice; and
a valve plate having a second contact surface disposed in contact with the first contact surface of the stationary body plate,
wherein the valve plate is configured to rotate relative to the stationary body plate to obscure the metering orifice in a
direction of a fluid velocity profile;

wherein at least one of the first contact surface and the second contact surface comprises a surface flatness of less than
2.4 ?m and greater than 1 ?m, a smoothened original surface roughness of less than 0.2 ?m, and an enhanced surface roughness
of at least 0.2 ?m.

US Pat. No. 9,413,208

ENHANCED COOLING OF ENCLOSED AIR COOLED HIGH POWER MOTORS

Hamilton Sundstrand Corpo...

1. A fan motor assembly comprising:
a motor housing,
a stator located radially inward from the motor housing;
a rotor located radially inward from the stator, the stator and the rotor defining a rotor stator gap there between, wherein
air is drawn through the rotor stator gap;

a shaft located radially inward from and connected to the rotor;
a heat exchanger mounted on, connected directly to, and extending radially outward from the shaft, the heat exchanger is configured
to transfer heat from the heat exchanger to the air drawn through the rotor stator gap; and

a plurality of cooling channels disposed between a radially outer surface of the motor housing and a radially inner surface
of the motor housing, the cooling channels extending in an axial direction parallel to the shaft, wherein the cooling channels
are fluidly connected to the rotor stator gap.

US Pat. No. 9,370,083

GROUNDED DIODE PACK

Hamilton Sundstrand Corpo...

1. A method of preventing damaging static discharge of a diode pack comprising:
coupling an electrically conductive oil transfer tube bushing of the diode pack to a grounding connection;
conveying an oil through the electrically conductive oil transfer tube; and
dissipating an electrical charge from the oil to the grounding connection via the electrically conductive oil transfer tube
bushing.

US Pat. No. 9,350,225

INTEGRATED ELECTROMAGNETIC CLUTCH AND EDDY-CURRENT COUPLING

Hamilton Sundstrand Corpo...

1. A system for transmission of power from a driving member to a driven member comprising:
an electromagnetic clutch including a driving clutch member configured and adapted to rotate in common with an input shaft,
and a driven clutch member configured and adapted to rotate in common with an output shaft, wherein the driving clutch member
is operatively connected to an electromagnetic actuator for movement between a first position in which the driving clutch
member and the driven clutch member are engaged for common rotation and a second position in which the driving clutch member
and the driven clutch member are disengaged from one another for relative rotation; and

an eddy-current coupling operatively connected to drive the driven clutch member at a rate different from that of the driving
clutch member with the driving clutch member in the second position, wherein the electromagnetic actuator includes a synchronous
generator operatively connected to selectively generate an electromagnetic field to move the driving clutch member into the
second position, disengaged from the driven clutch member.

US Pat. No. 9,327,840

RAM AIR TURBINE WITH A SPEED ENGAGED CLUTCH

Hamilton Sundstrand Corpo...

4. A ram air turbine with a turbine assembly and a power train, the turbine assembly only coupling to the entire power train
upon reaching a desired rotational speed of the turbine assembly, comprising:
a clutch mechanism comprising an input shaft driven by the turbine assembly and an output shaft coupled to the power train
that have rotational freedom of movement about an axis of the clutch mechanism; and

a speed control mechanism comprising a helical spring with an axis of the helical spring in coincidence with the axis of the
clutch mechanism, with one of the ends of the helical spring wrapped about the input shaft and the other end of the helical
spring wrapped about the output shaft and the fit of the helical spring on the input shaft and the output shaft in combination
with a spring rate of the helical spring causing the helical spring to engage both the input shaft and the output shaft when
the turbine assembly attains at least the desired rotational speed.

US Pat. No. 9,325,170

MATRIX-BASED POWER DISTRIBUTION ARCHITECTURE

HAMILTON SUNDSTRAND CORPO...

1. A power management and distribution (PMAD) system, comprising:
first and second power supplies;
first and second loads;
a matrix of solid state power controllers (SSPCs) connected between the first and second power supplies and the first and
second loads, the matrix configured to selectively supply each of the first and second loads with a plurality of different
power levels based on on/off states of the SSPCs of the matrix; and

a PMAD controller configured to control each of the SSPCs of the matrix to selectively output a predetermined voltage to each
of the first and second loads, wherein each of the SSPCs of the matrix includes a current sensor configured to output a sensed
current to the PMAD controller, the PMAD controller is configured to adjust a power output from the first and second power
supplies based on the sensed current received from the SSPCs of the matrix, wherein the PMAD controller is configured to sum
the sensed current from all of the SSPCs of the matrix to generate a summed sensed current, divide the summed sensed current
by a number of power sources predetermined to deliver power to generate a reference voltage modification signal, and to adjust
a reference voltage supplied to the first and second power supplies based on the reference voltage modification signal.

US Pat. No. 9,316,157

FUEL SYSTEM FOR STARTING AN APU USING A HYBRID PUMP ARRANGEMENT

Hamilton Sundstrand Corpo...

1. A fuel system for an auxiliary power unit, the fuel system comprising:
a mechanical fuel pump for providing fuel flow to the auxiliary power unit, the mechanical fuel pump having an output dependent
upon an operational speed of the auxiliary power unit;

an electric fuel pump for providing fuel flow to the auxiliary power unit, the electric fuel pump located upstream of the
mechanical fuel pump on a common fuel supply conduit; and

a controller for causing the electric fuel pump to provide fuel flow during starting of the auxiliary power unit;
a bypass conduit having a first end and a second end, the first end of the bypass conduit fluidly connected to the fuel supply
conduit upstream of the electric fuel pump and the second end of the bypass conduit fluidly connected to the fuel supply conduit
downstream of the electric fuel pump, wherein the first and second ends of the bypass conduit are upstream from the mechanical
fuel pump;

a bypass check valve located on the bypass conduit, the check valve having an open configuration that allows fuel to flow
from the first end of the bypass conduit to the second end of the bypass conduit and a closed configuration that prevents
fuel from flowing from the second end of the bypass conduit to the first end of the bypass conduit;

a relief conduit having a first end and a second end, the first end of the relief conduit fluidly connected to the fuel supply
conduit downstream of the electric fuel pump and the second end of the relief conduit fluidly connected to the fuel supply
conduit upstream of the electric fuel pump; and

a relief check valve located on the relief conduit, the check valve having an open configuration that allows fuel to flow
from the first end of the relief conduit to the second end of the relief conduit and a closed configuration that prevents
fuel from flowing from the second end of the relief conduit to the first end of the relief conduit.

US Pat. No. 9,300,194

ELECTROMAGNETIC DEVICE

HAMILTON SUNDSTRAND CORPO...

1. An electromagnetic device, comprising:
a stator defining a bore;
a rotor rotatable within the stator bore and having permanent magnetic elements disposed about an outer surface thereof to
define a series of magnetic poles;

power coils configured to generate a power current as a first portion of the magnetic poles pass each of the power coils due
to rotor rotation; and

sense coils configured to generate a sense current as a second portion of the magnetic poles pass each of the sense coils
due to the rotor rotation,

the power and sense coils being disposed in a circumferentially displaced, non-overlapping and co-radial condition and separated
at complementarily opposite respective ends thereof.

US Pat. No. 9,229,459

SATURATION CONTROL OF MAGNETIC CORES OF BIDIRECTIONAL DEVICES

Hamilton Sundstrand Corpo...

1. A method of controlling saturation of a magnetic core of a transformer, the method comprising:
providing cycles of bidirectional excitation to a transformer at a first frequency and a first duty cycle;
sensing, using a Hall sensor, a first field value of the magnetic core;
adjusting, using a processor, the first duty cycle in response to the magnitude of the first field value exceeding a first
threshold magnitude;

sensing, using the Hall sensor, a second field value of the magnetic core in response to the magnitude of the first field
value exceeding the first threshold magnitude; and

adjusting, using the processor, the first frequency in response to a magnitude of the second field value exceeding a second
threshold magnitude.

US Pat. No. 9,198,328

THERMAL SEPARATION OF ELECTRONIC CONTROL CHASSIS HEATSINK FINS

Hamilton Sundstrand Corpo...

1. An electronics chassis for containing and supporting electronic components having different operating temperatures, the
electronics chassis comprising:
a plurality of thermally conductive walls forming an enclosure;
a first heat dissipator in at least one of the walls having an external heat dissipation surface;
a second heat dissipator in at least one of the walls having an external heat dissipation surface; and
a thermal isolator positioned in at least one of the walls and substantially surrounding the first heat dissipator to provide
thermal isolation between the first and second heat dissipators, the thermal isolator comprising a thermally insulating material.

US Pat. No. 9,181,959

MOTOR HOUSING

Hamilton Sundstrand Corpo...

1. A housing of a compressor assembly comprising:
a main body portion;
a motor outlet duct extending radially from the main body portion; and
a flange extending radially from the main body portion to the motor outlet duct, wherein the motor outlet duct interfaces
with the main body portion at an interface area, wherein a ratio of a radius of the interface area to an inner diameter of
the motor outlet duct is from 0.113 to 0.162.

US Pat. No. 9,115,799

COMPACT GEARBOX FOR RAM AIR TURBINE OIL MANAGEMENT

Hamilton Sundstrand Corpo...

1. A ram air turbine gearbox housing comprising:
a housing body including a first flange defining a first plane and a second flange defining a second plane that is transverse
to the first plane, the housing body extending around an axis and having a first axial end and an opposite, second axial end
that are each open to an internal cavity of the housing body, the housing body including a radially-enlarged section at least
partially defining an oil sump within the internal cavity of the housing body, and a cover mounted at the second axial end,
the cover including an annular body extending around a central opening and between a first axial side and a second axial side,
the annular body including a lip extending from the first axial side to a free tip end to define an axial lip dimension, the
axial lip dimension varying with respect to circumferential position around the central axis.

US Pat. No. 9,103,376

CHAMBERED SHAFT FOR IMPROVED BEARING LUBRICATION

Hamilton Sundstrand Corpo...

1. A shaft for a bearing lubrication assembly, the shaft comprising:
an outer surface;
a reservoir disposed within the shaft;
a first seal groove formed on the outer surface and extending a full circumference of the outer surface;
a second seal groove formed on the outer surface and extending a full circumference of the outer surface;
a radial port extending from the reservoir to the outer surface, the radial port intersecting the outer surface between the
first seal groove and the second seal groove; and

a plurality of chambers formed in the shaft and positioned axially on the shaft between the first seal groove and the second
seal groove, the plurality of chambers being open to the outer surface, each chamber having a closed bottom disposed radially
inward from the outer surface, and each chamber of the plurality of chambers being spaced apart from one another along the
circumference of the outer surface of the shaft.

US Pat. No. 9,502,794

FIELD-REPLACEABLE TERMINAL BLOCK DIVIDER

HAMILTON SUNDSTRAND CORPO...

1. A terminal block assembly, comprising:
two or more blocks each formed from an electrically insulating material and having one or more terminal connectors disposed
thereon and extending from a surface of the respective block, each block having at least one groove formed along an edge of
the surface, each groove being configured to form a socket of a sliding dovetail joint when two or more blocks are joined
together and when a groove of a first block is aligned with a groove of a second block; and

one or more electrically insulating dividers each having a tenon formed thereon, the tenon being configured to be inserted
into the socket such that the divider extends from the surface of the blocks.

US Pat. No. 9,466,983

AUXILIARY WINDING FOR EXTENDED CURRENT MEASUREMENT

Hamilton Sundstrand Corpo...

7. A method comprising: providing a first output voltage from a primary current sensor that includes a primary conductor that
carries a primary current to a load, and an auxiliary conductor that carries zero current, wherein the first output voltage
is directly proportional to the primary current;
determining if the primary current is greater than a first threshold value based upon the first output voltage; controlling
a current source to provide an auxiliary current to the auxiliary conductor of the primary current sensor if the primary current
is greater than the first threshold value, wherein the auxiliary current is in the opposite direction of the primary current
to provide partial flux cancellation for the current sensor; providing a second output voltage from the primary current sensor
based upon the primary current and the auxiliary current; determining the primary current to the load based upon the second
output voltage and the auxiliary current; determining a total power over a time period to the load based upon the primary
current to the load; and commanding a power switch off to disable the power to the load if the total power over the time period
is greater than a second threshold.

US Pat. No. 9,458,730

PROPELLER BLADE WITH RELATIVELY MOVABLE COUNTERWEIGHT

Hamilton Sundstrand Corpo...

1. A propeller rotor comprising:
a rotor mounting a plurality of blades, said blades having a root mounted in a hub of said rotor and a counterweight movably
mounted on said blades wherein said counterweight is movable relative to said blade;

a pitch change mechanism for changing an angle of incidence of an airfoil associated with said blades, and said counterweight
for biasing said blades toward an increased pitch direction should said pitch change mechanism fail;

a stop member for stopping rotation of said counterweight as said blade moves to a feathered position; and
wherein said counterweight moves for a portion of the movement of the blade to the feathered position, but is stopped at some
point before the blade reaches the feathered position.

US Pat. No. 9,394,685

NOISE ABATEMENT FOR AIRCRAFT COMPONENTS AND SYSTEMS IN AIRCRAFT BAYS

HAMILTON SUNDSTRAND CORPO...

1. An acoustic absorption material, comprising:
an outer layer comprising a silicone-coated glass cloth;
a first layer of batting material proximate to and contacting the outer layer; and
a first layer of room temperature vulcanized silicone (RTV) proximate to and contacting the first layer of batting material,
wherein the outer layer, the first layer of batting material, and the first layer of RTV form an acoustic blanket having a
circular shape and configured for attachment to a pump.

US Pat. No. 9,385,647

REDUCTION TECHNIQUE FOR PERMANENT MAGNET MOTOR HIGH FREQUENCY LOSS

HAMILTON SUNDSTRAND CORPO...

1. A system comprising:
a motor loss controller structure configured for motor loss reduction, comprising an input bandshifting stage, an integral
controller stage, and an output inverse bandshifting stage;

wherein inputs to the system are a feedback signal, a motor frequency signal and a control value,
wherein the sine of an angular component of a multiple of the motor frequency signal is multiplied by the feedback signal
in the input bandshifting stage to form a first band-shifted feedback signal,

wherein the cosine of the angular component of a multiple of the motor frequency signal is multiplied by the feedback signal
in the input bandshifting stage to form a second band-shifted feedback signal,

wherein errors in the first band-shifted feedback signal and the second band-shifted feedback signal are cancelled via integral
control in the integral controller stage,

wherein an inverse frequency-shift transformation is applied to an output of the integral controller stage in the output inverse
bandshifting stage, and

wherein a phase lead compensation is introduced at the multiple of the motor frequency signal.

US Pat. No. 9,353,804

HARMONIC DRIVE ASSEMBLY WITH SELECTIVE DISCONNECT AND METHOD

HAMILTON SUNDSTRAND CORPO...

1. A harmonic drive assembly with selective disconnect comprising:
a motor with a motor drive shaft;
a harmonic drive operatively coupled to one end of the motor drive shaft;
a wave generator of the harmonic drive operatively coupled to the motor drive shaft and a flex gear of the harmonic drive;
a ring gear of the harmonic drive operatively coupled to the flex gear with a plurality of ring gear teeth configured to mesh
with a plurality of flex gear teeth;

an output shaft operatively coupled to the harmonic drive; and
a retracting mechanism configured to selectively retract the motor drive shaft and the wave generator axially to decouple
the motor drive shaft from the harmonic drive and to decouple the wave generator from the flex gear, wherein a clearance between
the ring gear teeth and the flex gear teeth is established upon retraction of the motor drive shaft and the wave generator.

US Pat. No. 9,347,455

EJECTOR ASSEMBLY

Hamilton Sundstrand Corpo...

1. A recirculation flow collector for a fan, the collector comprising:
an arcuate housing;
a first face with a first circular opening to receive flow from the fan;
a second face with a second circular opening to allow flow in a normal operating condition of the fan; and
an outlet in a bottom of the arcuate housing in fluid communication with a recirculation path extending between the outlet
and the first circular opening to allow recirculation flow therethrough in a blocked operating condition of the fan, wherein
the arcuate housing is configured such that recirculation flow is directed circumferentially around the arcuate housing towards
the outlet in the blocked operating condition.

US Pat. No. 9,325,229

GENERATOR ARCHITECTURE WITH PMG EXCITER AND MAIN FIELD ROTATING POWER CONVERTER

Hamilton Sundstrand Corpo...

1. A generator comprising:
a stationary portion that includes a permanent magnet and a main armature winding;
a rotating portion that includes a main field winding and a main field rotating power converter that regulates current through
the main field winding

a stationary communication module located on the stationary portion; and
a rotating communication module located on the rotating portion that is coupled to receive input from the stationary communication
module, wherein the rotating communication module communicates instructions received from the stationary communication module
to the main field rotating power converter to regulate the current through the main field winding.

US Pat. No. 9,316,622

MICROWAVE VIBRATION SENSORS

Hamilton Sundstrand Corpo...

4. A vibration sensor comprising:
a probe body with a vibration isolator operatively connected to the probe body for isolation of the probe body from vibrations
of a structure to be monitored for vibration;

a waveguide operatively connected to the probe body to convey microwaves to and from a surface for sensing vibration of the
structure to be monitored for vibration;

a reflector operatively connected to the probe body spaced apart from the waveguide for reflecting microwaves into the waveguide;
a cap operatively connected to the vibration isolator, wherein the cap is configured and adapted to be mounted to a surface
for sensing vibration thereof, and wherein the reflector is operatively connected to the cap within a space bounded by the
probe body and cap; and

a pedestal connecting between the reflector and the cap, wherein the reflector has a mass, and wherein the mass of the reflector
and at least one of a spring coefficient and a damper coefficient of the pedestal are tuned to amplify vibration of the reflector
in response to vibrations of a predetermined frequency in the structure to be monitored for vibrations.

US Pat. No. 9,222,187

ARTICLE HAVING COBALT-PHOSPHOROUS COATING AND METHOD FOR HEAT TREATING

Hamilton Sundstrand Corpo...

1. A method of processing an article, comprising:
heat treating an article having a substrate and a cobalt-phosphorous coating disposed on the substrate;
selecting a heat treating temperature that alters a bonding strength and maintains an initial hardness of the cobalt-phosphorous
coating prior to the heat treating; and

altering at least one physical characteristic of the cobalt-phosphorous coating using the heat treating to thereby change
a performance characteristic of the article, wherein altering the at least one physical characteristic of the cobalt-phosphorous
coating includes altering a bonding strength between the cobalt-phosphorous coating and the substrate.

US Pat. No. 9,212,608

LOW FRICTION FUEL METERING VALVE

Hamilton Sundstrand Corpo...

1. A fuel metering valve comprising:
a sleeve having an upstream end and a downstream end, the sleeve comprising:
a gear pump inlet port;
a fuel inlet port arranged downstream of the gear pump inlet port;
a fuel outlet port arranged downstream of the fuel inlet port;
a low pressure port arranged downstream of the fuel outlet port and fluidically connected to the gear pump inlet; and
a fuel shutoff port arranged downstream of the fuel outlet port;
a valve spool having a stroke length along the upstream-downstream axis, the valve spool comprising:
a first land arranged to contact the sleeve downstream of the gear pump inlet port and the shutoff port;
a second land arranged such that the fuel outlet port extends farther upstream than the second land, and when the fuel metering
valve is in a shutdown state the second seal land extends farther in both the upstream and downstream directions than the
fuel outlet port to minimize the fuel flow from upstream of the second seal land to downstream of the second seal land via
the gear pump inlet port and the shutoff port;

a third land arranged upstream of the fuel inlet port and downstream of the gear pump inlet; and
a fourth land arranged upstream of the gear pump inlet.

US Pat. No. 9,211,878

IN SITU FLAP AND SLAT WING TIP BRAKE RESPONSE TESTER

Hamilton Sundstrand Corpo...

1. A method of determining a validity of an estimate of a response time of a brake, comprising:
performing an action that initiates engagement of the brake;
obtaining a waveform of a parameter related to the engagement of the brake;
determining inflection points in the waveform within a selected time period to estimate the response time of the brake; and
providing an indicator when a number of determined inflections points is greater than a selected count value to indicate the
validity of the of the estimate.

US Pat. No. 9,188,105

STRUT DRIVESHAFT FOR RAM AIR TURBINE

Hamilton Sundstrand Corpo...

1. A driveshaft for an aircraft ram air turbine, the driveshaft comprising:
an elongate portion, wherein the elongate portion is substantially cylindrical;
a first end extending from the elongate portion; and
a second end extending from the elongate portion opposite the first end, wherein the first and second ends each include a
substantially frusto-conical section having a curved generatrix such that distal portions of each of the first and second
ends have smaller outer diameters than an outer diameter of the elongate portion;

wherein the first and second ends are mechanically connected to a driveline that extends between a power conversion device
and a turbine;

wherein at least one of the first and second ends further comprises:
a cylindrical portion located radially outward from the substantially frusto-conical section, wherein at least part of the
cylindrical portion axially overhangs the substantially frusto-conical portion such that the cylindrical portion is separated
from the distal portion of the corresponding first or second end by a radial gap,

wherein the elongate portion provides higher lateral stiffness than the first and second ends, and wherein the first and second
ends provide lower torsional stiffness than the elongate portion, such that the driveshaft has an overall lateral natural
frequency higher than an operating range of the driveshaft and has an overall torsional natural frequency below the operating
range of the driveshaft.

US Pat. No. 9,166,465

CURRENT DIVIDER FOR EXTENDED CURRENT MEASUREMENT

Hamilton Sundstrand Corpo...

9. A system comprising:
a power switch controlled to provide power to a load;
a primary conductor that carries a primary current from the power switch to the load;
a primary current sensor that provides a first output directly proportional to the primary current;
a current divider that includes a first conductor and a second conductor, wherein an impedance of the second conductor is
greater than an impedance of the first conductor;

a secondary current sensor that provides a second output directly proportional to a secondary current in the second conductor
of the current divider; and

a controller that controls the power switch based upon the primary current, wherein the controller determines the primary
current based upon the first output if the primary current is less than a threshold value, and based upon the second output
if the primary current is greater than the threshold value.

US Pat. No. 9,146,294

BUILT-IN TEST INJECTION FOR CURRENT SENSING CIRCUIT

Hamilton Sundstrand Corpo...

1. A current sense system comprising:
a current transformer having a primary coil and a secondary coil, wherein the secondary coil has a first and second terminal;
a burden resistor connected between the first terminal of the secondary coil and ground;
a monitor circuit that measures current in the primary coil by monitoring voltage across the burden resistor; and
a built-in test (BIT) circuit connected to the second terminal of the secondary coil, wherein the BIT circuit comprises:
an operational amplifier circuit having an output connected to the second terminal of the secondary coil; and
a first controller configured to control a state of the operational amplifier circuit, wherein the first controller provides
a first output and a second output to control the state of the operational amplifier circuit; and

wherein the first and second outputs are logic low values to operate in a first state in which the output of the operational
amplifier is a virtual ground, wherein the first output is a logic high value and the second voltage is a logic low value
to operate in a second state in which the output of the operational amplifier is a positive voltage, and wherein the first
output is a logic low value and the second output is a logic high value to operate in a third state in which the output of
the operational amplifier is a negative voltage.

US Pat. No. 9,137,925

HEAT SINK FOR CONTACTOR IN POWER DISTRIBUTION ASSEMBLY

Hamilton Sundstrand Corpo...

1. An electrical contactor assembly comprising:
an electrical contactor;
an electrical bus bar;
a panel formed from an electrically insulating material;
one or more posts protruding through the panel and in contact with the electrical bus bar, the one or more posts being constructed
from an electrically and thermally conductive material, wherein a first end of each of the one or more posts is configured
to electrically and thermally connect to the electrical contactor; and

a heat sink removably coupled directly to a second end of one of the one or more posts, the heat sink including a body having
a plurality of fins stacked axially along the body, wherein in a first portion of the plurality of fins, each fin of the first
portion extends around an entire circumference of the body and in a second portion of the plurality of fins, each fin of the
second portion extends around only a portion of the circumference of the body.

US Pat. No. 9,124,158

PHASE SEPARATOR INSULATOR FOR ELECTRIC MACHINE STATOR

Hamilton Sundstrand Corpo...

5. A stator assembly for an electric machine, the stator assembly comprising:
a stator core having a plurality of stator teeth extending radially inward from the stator core, the plurality of stator teeth
defining a plurality of stator slots for receiving phase windings;

a first phase winding having windings located in a first plurality of the stator slots and having endturn portions extending
beyond the stator core;

a first phase separator located adjacent the first phase winding, the first phase separator having first and second endturn
portions and first and second leg portions integrally formed with and connecting the first endturn portion with the second
endturn portion, wherein the first and second leg portions fit within the stator slots and the first and second endturn portions
each have inner and outer surfaces that are curved to match a geometry of the endturn portions of the first phase winding,
each of the first and second endturn portions including a tabbed portion located opposite the curved outer surface; and

a second phase winding having windings located in a second plurality of stator slots and having endturn portions extending
beyond the stator core, wherein the first phase separator electrically insulates the first phase winding form the second phase
winding.

US Pat. No. 9,068,511

PRESSURE REGULATING VALVE

Hamilton Sundstrand Corpo...

1. A method of installing a pressure regulating valve assembly in a fuel control, the method comprising:
inserting a pressure regulating valve sleeve into a pressure regulating valve section of a fuel control housing, the pressure
regulating valve sleeve comprising a first window set, a second window set, and a limiting lip;

arranging a pressure regulating valve spool within the pressure regulating valve sleeve, the pressure regulating valve spool
comprising a limiting lip, a first cylindrical portion, a second cylindrical portion, a third cylindrical portion formed between
the first and second cylindrical portions, wherein the first cylindrical portion and the second cylindrical portion have a
substantially equal first diameter, the third cylindrical portion has a second diameter, and a ratio of the first diameter
to the second diameter is between 1.60 and 1.65, and the pressure regulating valve spool is arranged to establish a diametral
clearance of 0.0003 and 0.0005 inches (0.000762-0.00127 cm) between an inner diameter of the pressure regulating valve sleeve
and the first diameter; and

coupling a resilient member to the pressure regulating valve spool in the pressure regulating valve section of the fuel control
housing, the resilient member forcing the limiting lip of the pressure regulating valve spool into contact with the limiting
lip of the pressure regulating valve sleeve.

US Pat. No. 9,057,372

GEAR ROOT GEOMETRY FOR INCREASED CARRYOVER VOLUME

Hamilton Sundstrand Corpo...

1. A gear comprising:
a plurality of involute gear teeth including first and second neighboring gear teeth each having a respective tooth profile
curve that extends diametrically inwards of a true involute form diameter, said first and second neighboring gear teeth defining
a tooth space centerline there between;

a gear root geometry between said first and second neighboring gear teeth, said gear root geometry defining a gear root diameter
and including a gear root flat that is tangent to said gear root diameter at said tooth space centerline, first and second
radiused fillets flanking, respectively, said gear root flat, said first and second radiused fillets joining said gear root
flat to, respectively, first and second upper flats, said first and second upper flats blending into said tooth profile curves
at locations diametrically inside of said true involute form diameter.

US Pat. No. 9,461,527

MULTIPLE CONDUCTOR WINDING IN STATOR

Hamilton Sundstrand Corpo...

1. A method for reducing eddy current within a stator, the method comprising:
inserting at least two windings with rectangular cross sections at least partially into each of a plurality of slots of a
stator disposed about an axis such that the windings are stacked down the longitudinal side of the slot, each winding including
a first portion disposed radially inwardly of a second portion;

orienting at least two windings such that the at least two windings extend across a depth of the slot;
arranging the at least two windings at least partially in each slot such that all first portions of each winding in the same
slot are in contact with each other at an end and all second portions of each winding in the same slot are in contact with
each other at another end;

aligning the first portions of said windings in each said slot with the second portions of said windings in another one of
said slots which is not immediately circumferentially adjacent, such that the aligned first portions and second portions are
electrically connected; and

arranging each of the at least two windings such that a knuckle of each winding is disposed in one of the plurality of slots,
said knuckle including a twisted portion of the winding.

US Pat. No. 9,381,452

COKE TOLERANT FUEL FILTER

Hamilton Sundstrand Corpo...

1. A filter for use with a fuel system having contaminants therein, said filter comprising:
a plurality of apices;
a plurality of ridges, each ridge attaching an apex to an adjacent apex wherein a plurality of ridges and adjoining apices
define a first opening;

a second opening in register with said first opening wherein said second opening has less surface area than said first opening;
a first side attaching said first opening and said second opening wherein said first side tapers inwardly from said first
opening to said second opening;

a third opening in register with said second opening;
a fourth opening defined by a second plurality of apices and ridges and in register with said third opening wherein said third
opening has less surface area than said fourth opening;

a second side attaching said third opening and said fourth opening wherein said second side tapers outwardly from said third
opening to said fourth opening; and

a flow passage from said first opening to said second opening decreasing in cross-sectional area, then moves through said
third opening, and increases in cross-sectional area until reaching said fourth opening.

US Pat. No. 9,374,828

CHANNEL ALLOCATION FOR A MULTI-DEVICE COMMUNICATION SYSTEM

Hamilton Sundstrand Corpo...

1. A wireless communication method for a non spaced-based network, comprising:
selecting at least one frequency band for transmitting data within a non spaced-based network;
allocating a plurality of definite purpose channels in a first portion of the at least one frequency band, wherein the plurality
of definite purpose channels corresponds with at least one definite purpose function and wherein each definite purpose channel
carries data associated with at least one definite purpose system device to be connected to the network and that carries out
one definite purpose function;

allocating separately a second plurality of definite purpose channels in a second portion of the at least one frequency band;
and

allocating at least one public channel for carrying data corresponding to at least one user device.

US Pat. No. 9,369,021

WINDING ASSEMBLY FOR AN ELECTRIC GENERATOR AND MOTOR ROTOR AND METHOD OF MAINTAINING POSITION OF A WINDING ASSEMBLY

HAMILTON SUNDSTRAND CORPO...

1. A winding assembly for an electric generator comprising:
a stator core having a relatively cylindrical inner shape;
a rotor core coaxially rotatable within the stator core, wherein the rotor core includes an input shaft;
a rotor winding support structure on the rotor core and comprising a radially inner surface, a radially outer surface and
a surface extending between the radially inner surface and the radially outer surface, the surface extending radially outward
from the input shaft toward the stator core, the entire length of the surface disposed at an angle that is non-perpendicular
and non-parallel to an axis of rotation of the rotor core; and

a rotor winding bundle disposed along, and supported by, the surface of the rotor winding support structure, wherein the angle
relative to the input shaft is less than 90 degrees as the surface extends radially outwardly to form an incline of resistance
for the rotor winding bundle, the incline of resistance extending along an entire length of the surface extending between
the radially inner surface and the radially outer surface.

US Pat. No. 9,303,529

LUBE SPACER BEARING WITH PRESSURE LOADING CHANNEL

Hamilton Sundstrand Corpo...

21. A method of installing a lube spacer bearing into a lube and scavenge gear pump comprising the steps of:
providing a first lube spacer bearing and a second lube spacer bearing each having a first axial side, a second axial side,
an outer radial side, and an inner radial side defining a bore extending parallel to a central axis, wherein the outer radial
side includes an arcuate portion and a planar portion extending between each end of the arcuate portion, wherein a channel
is defined in the arcuate portion of the outer radial side between the first axial side and the second axial side and extending
a circumferential length around the outer radial side, wherein a channel width (CW) is defined between a first channel wall
and a second channel wall and a bearing length (BL) is defined between the first axial side and the second axial side, wherein
a ratio of CW/BL is between 0.45 and 0.70;

sliding the first lube spacer bearing onto a first shaft and the second lube spacer bearing onto a second shaft to create
a stack including the first lube spacer bearing, second lube spacer bearing, first shaft and second shaft; and
inserting the stack into a housing such that the stack is positioned in a lube section of the housing with each channel facing
an outlet side opposite a fluid inlet to the housing; wherein the circumferential length is a circumferential arc angle beginning
at a position 180° from the planar portion of the bearing body and extending 90° to 120° about the arcuate portion.

US Pat. No. 9,297,685

ROBUST OIL LEVEL SENSOR

Hamilton Sundstrand Corpo...

1. An oil level sensor comprising:
a sensor having a body and a probe extending away from a top surface of said body, said probe receiving a resistance thermal
device, said probe extending for a height away from said top surface, and said probe having an outer dimension, a ratio of
the outer dimension to the height being between 0.1 and 0.2;

said resistance thermal device having fine wires connected to lead wires through splices, and said lead wires leaving said
body;

a fastener tab extending away from said body;
said lead wires being anchored within a chamber defined by said body, said chamber being filled with a potting material; and
said probe body having an exit opening for said lead wires to extend outwardly thereof, and said lead wires not being secured
directly to said body at said exit opening, but instead held by said potting material, with an anchor being positioned between
said opening and said resistance thermal device.

US Pat. No. 9,227,731

ELECTRICAL POWER TRANSFER SYSTEM FOR PROPELLER SYSTEM

HAMILTON SUNDSTRAND CORPO...

1. A propeller system for an aircraft comprising:
a propeller assembly rotatable about a central axis;
a reduction gearbox operably connected to the propeller assembly via a propeller shaft; and
an electrical power transfer system positioned such that the gearbox is located axially between the electrical power transfer
system and the propeller assembly and including:

a slip ring assembly operably connected to an oil transfer tube extending to the propeller assembly, the slip ring assembly
comprises:

a slip ring tube operably connected to the oil transfer tube via a slip ring drive tab;
a slip ring bearing supportive of the slip ring tube; and
a plurality of slip rings affixed to the slip ring tube; and
a brush block interactive with the slip ring assembly to transfer electrical power to a plurality of lead wires extending
from the slip ring assembly to the propeller assembly, the brush block positioned such that brush block tips of the brush
block extend toward the slip ring assembly in a substantially radial direction relative to the central axis.

US Pat. No. 9,175,991

METHOD OF FORMING A PITOT TUBE VALVE ASSEMBLY WITH AN ANTI-ROTATION MECHANISM

Hamilton Sundstrand Corpo...

1. A method of forming a valve assembly having a housing, the method comprising:
machining a first through-hole into the housing;
machining a slot partially along the first through-hole;
coupling an anti-rotation mechanism with a pitot tube to form a pitot tube assembly; and
installing the pitot tube assembly within the first through-hole such that the anti-rotation mechanism sits within the slot,
wherein the machining of the slot comprises machining the slot to extend from an upper surface of the housing and along a
partial length of the first through-hole.

US Pat. No. 9,172,301

SYNCHRONOUS RECTIFICATION IN THE THREE-LEVEL INVERTER-CONVERTER TOPOLOGIES

Hamilton Sundstrand Corpo...

1. A power module comprising:
a) a first module block defining a first synchronous rectifier and including a first synchronous rectifier switch having a
first power FET and connected in parallel with a first diode;

b) a second module block including a second power FET connected in parallel with a second diode;
c) a third module block including a third power FET connected in parallel with a third diode, wherein the second and third
module blocks are positioned between first and second terminal interfaces of the power module, and wherein two serially connected
diodes are utilized on the first terminal interface side of the power module in parallel with the serially connected second
and third module blocks; and

d) a fourth module block defining a second synchronous rectifier and including a second synchronous rectifier switch having
a fourth power FET and connected in parallel with a fourth diode;

wherein each synchronous rectifier comprises a silicon carbide (SiC) power MOSFET connected in parallel with a power diode,
the power diode being a silicon carbide (SiC) Shottky diode.

US Pat. No. 9,115,938

TWO-PHASE DISTRIBUTOR

Hamilton Sundstrand Corpo...

1. A heat exchanger comprising:
a distributor comprising:
an outer housing and including a plurality of substantially parallel plates disposed within the housing and configured to
partition an input two-phase flow into a series of primarily single-phase layers, the plates are arranged such that a normal
extending from a surface of the plates is substantially perpendicular to a direction of the flow; and

a plurality of holes through the outer housing, each hole defining a fluid path that extends from within the housing to an
exterior surface of the outer housing to discharge flow from the distributor,

wherein the fluid path extends perpendicular to the normal of the surface of the plates, and wherein the normal and the fluid
paths are each substantially perpendicular to a direction of the flow.

US Pat. No. 9,108,742

RAM AIR TURBINE STOW ABORT ASSEMBLY

Hamilton Sundstrand Corpo...

1. A ram air turbine stow abort assembly comprising:
a release pin movable between an engaged position that prevents rotation of a turbine drive shaft and a released position
that allows rotation of the turbine drive shaft;

a release lever rotatable about an axis in response to the release pin being in the engaged position or the released position;
and

a pawl having a link to the release lever, wherein the link causes the pawl to move toward the axis from a locking position
to a clearance position, the pawl positioned to engage a lock when in the locking position to prevent movement of the ram
air turbine assembly to a stowed position.

US Pat. No. 9,092,024

MOTOR SPEED ENHANCEMENT

Hamilton Sundstrand Corpo...

1. A method to discharge a coil, comprising:
receiving a step command from a controller by a circuit in connection with a stepper motor;
discharging a first current in the coil of the circuit to a capacitor coupled to the coil responsive to the step command;
and

driving a second current in the coil via a charge stored on the capacitor during the discharging of the first current in the
coil,

wherein the coil is a polarity changing coil driven in a direction opposite a direction associated with the discharging of
the first current,

wherein the discharging of the first current and the driving of the second current via the capacitor is a recirculation of
energy.

US Pat. No. 9,072,921

THERMODYNAMICALLY-OPTIMIZED ADVANCED FIRE SUPPRESSION SYSTEM

Hamilton Sundstrand Corpo...

1. A fire suppression system for an aircraft comprising:
an air separation module configured to receive exhaust air and intake air and configured to provide nitrogen-enriched air
and inert gas;

a nitrogen-enriched air distribution network into which the nitrogen-enriched air flows for fuel tank inerting; and
an inert gas distribution network into which the inert gas flows for fire suppression in areas of the aircraft other than
fuel tanks.

US Pat. No. 9,555,893

BLENDED FLOW AIR CYCLE SYSTEM FOR ENVIRONMENTAL CONTROL

HAMILTON SUNDSTRAND CORPO...

1. An aircraft air provision system comprising:
a power turbine that receives bleed air, the power turbine providing rotational energy to a shaft and outputs output air at
an intermediate pressure, the bleed air received from a first source consisting of a compressor section of an engine;

a compressor coupled to the shaft that receives input air from the compressor section of the engine, the compressor outputting
compressed air having a pressure equal to the intermediate pressure;

a mix chamber coupled to outputs of both the power turbine and the compressor where the output air and the compressed air
are mixed;

a second heat exchanger in fluid communication with an output of the mix chamber, the second heat exchanger receiving ram
air from a ram air scoop for mixing with the output of the mix chamber;

a second fan coupled to the shaft, wherein the second fan draws air through the second heat exchanger;
a cooling turbine coupled to the shaft and that is in fluid communication with an output of the second heat exchanger; and
a precooling heat exchanger in fluid communication with an input of the power turbine and configured to cool air exiting the
compressor section, wherein the precooling heat exchanger utilizes air from a first fan of the engine to cool air exiting
the compressor section, wherein the bleed air is received from an output of the precooling heat exchanger.

US Pat. No. 9,527,594

CONDENSER WITH RECIRCULATION AIR MIXER

Hamilton Sundstrand Corpo...

10. An air conditioning machine comprising:
a primary heat exchanger to cool the air received into the air conditioning system;
a compressor connected to the primary heat exchanger to compress the air;
a secondary heat exchanger to receive the compressed air and further cool the compressed air;
a condenser to receive the cooled air from the secondary heat exchanger and remove condensed water vapor;
a turbine connected to the condenser to receive condensed air from the condenser and expand the condensed air;
a recirculation air mixer to mix recirculation air with expanded air from the turbine, the mixer including a cold inlet aligned
in the axial direction, an annulus disposed radially around a plenum, a recirculation air inlet connected to the annulus,
and a plurality of injectors adapted to inject the recirculation air in at least a radial direction from the annulus into
the plenum; and

an outlet to provide the mixed air for use in as conditioned air for an aircraft cabin;
wherein:
the plenum comprises four walls, each wall including a surface tapered outwardly from the cold inlet, the tapered surfaces
defining a fluid mixing space in the plenum having a rectangular shaped opening connected to the chamber of the condenser;

the plurality of injectors comprises at least four injectors, with at least one injector formed through each tapered surface
of the plenum; and

at least one of the plurality of injectors is teardrop shaped.

US Pat. No. 9,502,942

ELECTRIC GENERATOR OIL PUMP DRIVE GEAR

Hamilton Sundstrand Corpo...

1. A drive gear for use with an electrical generator comprising:
a gear hub having a ledge portion with a plurality of gear teeth at an outer periphery and centered about a central axis,
and said gear hub having a mount structure extending axially away from said ledge, a first distance being defined between
axial ends of said gear teeth, a second distance defined between ends of said gear hub;

a ratio of said first distance to said second distance being between 0.520 and 0.544; and
wherein said gear teeth have a flat radially outer end and curved sides, with there being four roll angles on each of said
sides, with a first roll angle extending for 6.70° to 8.70°, a second roll angle extending for 11.10° to 13.1°, a third roll
angle extending for 24.4° to 26.4°, and a fourth roll angle extending for 28.9° to 30.9°.

US Pat. No. 9,500,171

PRESSURE REGULATING VALVE

HAMILTON SUNDSTRAND CORPO...

1. A pressure regulating valve comprising:
a housing having a valve inlet and a valve outlet; and
a movable piston disposed in the housing, a position of the piston determined by a selected difference between an inlet pressure
and an outlet pressure, the movable piston at least partially defining one or more flow channels between the valve inlet and
the valve outlet;

wherein when the movable piston is in a fully open position, an axial inlet opening at an inlet end of the one or more flow
channels is smaller than an radial depth of the one or more flow channels at the inlet end of the one or more flow channels;

wherein the movable piston at least partially defines a single axially-tapered flow annulus extending around a circumference
of the movable piston, the axially-tapered flow annulus having a first depth at the inlet end greater than a second depth
at an outlet end of the flow channel wherein the movable piston at least partially defines a single axially-tapered flow annulus
extending around a circumference of the movable piston, the axially-tapered flow annulus having a first depth at the inlet
end greater than a second depth at an outlet end of the flow channel.

US Pat. No. 9,493,230

DRIVE ASSEMBLY WITH SELECTIVE DISCONNECT

Hamilton Sundstrand Corpo...

1. A drive assembly with selective disconnect comprising:
a motor with a motor drive shaft, the motor drive shaft having a first end and a second end;
a harmonic drive coupled to the first end of the motor drive shaft;
an output shaft coupled to the harmonic drive; and
a retracting mechanism that selectively retracts the motor drive shaft axially to decouple the motor drive shaft from the
harmonic drive, the retracting mechanism comprising:

a locking mechanism located at the second end of the motor drive shaft, the locking mechanism having a first end and a second
end, the first end of the locking mechanism located radially outside the motor drive shaft;

a solenoid connected to the second end of the locking mechanism, the solenoid being configured to selectively retract the
locking mechanism axially to move the locking mechanism from a locked position to an unlocked position; and

a spring attached to the motor drive shaft, the spring being configured to retract the motor drive shaft when the solenoid
moves the locking mechanism into an unlocked position.

US Pat. No. 9,470,328

VALVE INCLUDING MULTILAYER WEAR PLATE

HAMILTON SUNDSTRAND CORPO...

1. A valve, comprising:
a component including a surface; and
a wear plate including a surface disposed in sliding engagement with the surface of the component, the surface of the wear
plate comprising:

a corrosion resistant substrate;
a secondary layer disposed on a surface of the corrosion resistant substrate;
a noble metal layer disposed on a surface of the secondary layer; and
a tertiary layer disposed on a surface of the noble metal layer, wherein the tertiary layer comprises silver.

US Pat. No. 9,461,526

GROUNDED RADIAL DIODE PACK

HAMILTON SUNDSTRAND CORPO...

1. A method of preventing static discharge of a radial diode pack comprising:
coupling an electrically conductive oil transfer tube of the radial diode pack to a grounding connection; and
electrically coupling the electrically conductive oil transfer tube to a second electrically conductive oil transfer tube.

US Pat. No. 9,458,844

PROPELLER ROTOR AND ENGINE OVERSPEED CONTROL

Hamilton Sundstrand Corpo...

1. An electromagnetic device for overspeed control of a propeller driven by an engine shaft, the electromagnetic device comprising:
an electromechanical clutch disposed to mechanically decouple the propeller from the engine shaft;
an eddy-current coupler disposed to electromagnetically couple the propeller to the engine shaft when the clutch mechanically
decouples the propeller from the engine shaft; and

an electromagnetic brake disposed to impose an artificial load on the engine shaft when a propeller load on the engine shaft
is reduced by mechanically decoupling the propeller from the engine shaft;

wherein the electromechanical clutch and the eddy-current coupler are integrated in a rotating electromagnetic assembly comprising:
a field coil configured to receive a first energizing current;
a pole shoe energized by the first energizing current to electromagnetically decouple a ferromagnetic friction clutch cone
attached to the engine shaft from a friction clutch cup attached to the propeller; and

a rotating drum attached to the friction clutch cup and coupled via eddy currents to the pole shoe with a coupling strength
determined by a magnitude of the first energizing current.

US Pat. No. 9,458,881

AIR CYCLE MACHINE WITH BEARING FAILURE DETECTION

HAMILTON SUNDSTRAND CORPO...

1. A method of monitoring bearings comprising:
passing a working fluid through a flow passage over a surface of thin foil hydrodynamic bearings;
measuring a first temperature of the working fluid at a first position that is upstream relative to a segment of the thin
foil hydrodynamic bearings;

measuring a second temperature of the working fluid at a second position that is downstream relative to the segment of the
thin foil hydrodynamic bearings;

wherein the measuring of the first temperature and the second temperature are measure by thermocouples;
computing a temperature gradient from the first temperature and the second temperature;
comparing the temperature gradient to a known value; and
providing an alert if the temperature gradient exceeds the known value.

US Pat. No. 9,422,979

STANDPIPE ASSEMBLY

Hamilton Sundstrand Corpo...

1. A standpipe assembly to connect to a starter/generator housing with a standpipe base integral to the housing, the standpipe
assembly comprising:
a standpipe aligned within the housing so that the standpipe is oriented to drain oil through the standpipe when oil in the
housing reaches a threshold level, the standpipe having a first portion with a first end that sits within the housing and
a second portion with a second end that connects to the standpipe base, wherein the first portion extends along a first direction,
and wherein the second portion extends along a second direction that is different than the first direction; and

one or more brackets to secure the standpipe to the housing, wherein the one or more brackets comprise:
a first bracket comprising:
a first aperture configured to receive the second end of the standpipe and secure around the second end of the standpipe to
fit at least partially within the standpipe base in the housing; and

a second aperture configured to receive a fastener for securing the first bracket to the housing; and
a second bracket securing the standpipe to the housing.

US Pat. No. 9,407,121

ELECTROMECHANICAL ROTARY ACTUATOR AND METHOD

HAMILTON SUNDSTRAND CORPO...

1. An electromechanical rotary actuator comprising:
a housing including a first end that extends to a second end through an intermediate portion that defines a longitudinal axis,
the housing defining an internal cavity;

an electric motor arranged within the internal cavity, the electric motor including a stator and a rotor, the rotor surrounding
a shaft having a first shaft end and a second shaft end;

a drive member arranged within the housing along the longitudinal axis, the drive member including an input shaft operatively
coupled to the first shaft end and an output shaft;

an output shaft member coupled to the output shaft of the drive member, the output shaft member extending out from the first
end of the housing and being configured and disposed to rotate about the longitudinal axis;

at least one bearing assembly supporting one of the output shaft and the first shaft end; and
a preload member arranged within the housing and configured to apply a compressive axial force to the at least one bearing,
the drive member and the electric motor, the preload member accommodating thermal expansion of the electromechanical rotary
actuator along the longitudinal axis; and

a resolver operatively coupled to the one of the input shaft and the output shaft of the drive member;
wherein the at least one bearing assembly includes a first bearing assembly supporting the first shaft end and a second bearing
assembly supporting the output shaft member, and an end bearing assembly arranged to support the second shaft end, the first
and second bearing assemblies being subjected to the compressive axial force.

US Pat. No. 9,337,700

TERMINAL ASSEMBLY WITH REDUCED CREEPAGE

Hamilton Sundstrand Corpo...

1. A terminal assembly comprising:
a terminal board with an interrupted aperture and an interface defined at least partially around said interrupted aperture;
a passthrough with a first radially extending flange and a second radially extending flange, said passthrough extends through
said interrupted aperture and said first radially extending flange engaged with said interface; and

a terminal post mounted to said terminal board along a first axis, said passthrough being defined along a second axis offset
from said first axis.

US Pat. No. 9,303,563

MODULATING ELECTRIC LIQUID METERING VALVE WITH FLOW SENSING

HAMILTON SUNDSTRAND CORPO...

1. A fluid flow valve comprising:
a movable valve piston reciprocally disposed in a valve housing, the valve piston including a passage configured to flow a
fluid therethrough;

a metering window interactive with the movable valve piston to meter flow through the valve piston;
a flow meter disposed in the passage to measure a flow rate of the fluid through the valve piston; and
a valve controller operably connected to the flow meter and the movable valve piston to control a position of the valve piston
based on the measured flow rate.

US Pat. No. 9,299,488

MAGNETIC DEVICES WITH INTEGRAL COOLING CHANNELS

Hamilton Sundstrand Corpo...

1. A magnetic device, comprising:
an electrically insulating body defining:
an internal cavity for a magnetic device core, and
a coolant channel routed about the internal cavity;
a conductor coil extending through the insulating body; and
a cold plate coupled to the electrically insulating body and having a fluid conduit defined therein,
wherein the fluid conduit is fluidly connected to the coolant channel by a coolant inlet extending through the cold plate
and the insulating body,

wherein the fluid conduit is fluidly connected to the coolant channel by a coolant outlet extending through the cold plate
and the insulating body,

wherein the insulating body electrically insulates the internal cavity from the coolant channel and electrically insulates
the coolant channel from the conductor coil.

US Pat. No. 9,284,063

TAIL CONE DRIVEN EMERGENCY POWER GENERATING SYSTEM

Hamilton Sundstrand Corpo...

1. A tail cone integrated ram air turbine (RAT) comprising:
a rotatable segment of an aircraft tail cone configured to deploy a set of ram air turbine blades;
a power transfer shaft connected to the rotatable segment and configured to transfer power from the rotatable segment to an
auxiliary power unit (APU);

a controller connected to the APU and configured to control an auxiliary power output from the APU;
a first brake assembly connected to the tail cone integrated RAT and configured to stop and hold the tail cone integrated
RAT;

a second brake assembly connected to the APU and configured to stop and hold the APU; and
a speed summing differential connected to the first and second brake assemblies and configured to direct power to the aircraft.

US Pat. No. 9,272,293

PARTICLE SEPARATOR

Hamilton Sundstrand Corpo...

1. A particle separator comprising:
a substantially cylindrical vessel including a vessel sidewall extending between a vessel top side and a vessel bottom side,
the top side and the bottom side defined relative to the vessel sidewall in a vertical orientation;

a fluid inlet disposed on the vessel top side;
an fluid swirl passage including a first passage end in communication with the fluid inlet, and a second passage end in communication
with a vessel swirl cavity defined at least in part by an inner surface of the vessel sidewall;

a scupper cavity including a scupper entrance disposed along the inner surface of the vessel sidewall and spaced circumferentially
apart from the second passage end;

a first fluid outlet in communication with the scupper cavity and disposed on the vessel bottom side; and
a second fluid outlet in communication with the vessel swirl cavity, the second fluid outlet disposed on the vessel sidewall
above the first fluid outlet.

US Pat. No. 9,212,756

HIGH PRESSURE CHECK VALVE FLANGE JOINT

Hamilton Sundstrand Corpo...

1. A valve flange joint oriented about a centerline, the valve flange joint comprising:
an annular valve flange that includes a tab portion, and a body portion having a first valve flange face and a second valve
flange face;

an annular first duct flange that includes a first seal portion and a first mating portion, wherein the first seal portion
comprises a first groove configured to receive a seal between the first duct flange and the first valve flange face, and wherein
the first mating portion includes a rim, a first duct face in contact with the first valve flange face, and a first slot that
extends through the rim and the first mating portion; and

an annular second duct flange that includes a second seal portion and a second duct mating portion, wherein the second seal
portion comprises a second groove configured to receive a seal between the second duct flange and the second valve flange
face, and wherein the second duct mating portion includes a second duct face in contact with the second valve flange face,
and a second rim;

wherein the annular valve flange body portion extends radially outward from the centerline along the first and second seal
portions and the first and second duct faces;

wherein a first thickness is defined as a minimum distance between the first valve flange face and the second valve flange
face, and wherein the first thickness is maintained throughout an entire radial length of the annular valve flange body portion;
and

wherein the tab portion extends in an axial direction through the first slot, and wherein an inner surface of the tab portion
is radially inward of an outermost portion of the second mating portion.

US Pat. No. 9,194,254

REDUCED VELOCITY VALVE

Hamilton Sundstrand Corpo...

1. A lube system, comprising:
an air-oil tank including a deaerator configured to remove a first quantity of oil from a first air-oil supply to generate
a second air-oil supply having a second quantity of oil, which is smaller than the first quantity of oil, the air oil tank
being configured to output the second air-oil supply to an air vent line;

a de-oiler disposed along the air vent line and configured to remove from the second air-oil supply oil mist including oil
droplets of a minimum size; and

a pressure regulating valve (PRV) disposed along the air vent line between the air-oil tank and the de-oiler to regulate fluid
pressures within the air-oil tank,

the PRV being configured to encourage formation of the oil droplets of at least the minimum size by flowing the second air-oil
supply through a valve seat area defined by a movable poppet and a valve seat,

the valve seat defining serially discrete, axially arranged recesses all of which have randomly variable cross-sectional shapes
and randomly variable sizes and each recess having radial surfaces and an axial surface extending between angular corners
respectively formed by the axial surface with the radial surfaces.

US Pat. No. 9,192,043

PWB COOLING SYSTEM WITH HEAT DISSIPATION THROUGH POSTS

Hamilton Sundstrand Corpo...

1. An apparatus comprising:
a printed wiring board;
a post that supports the printed wiring board; and
a heat pipe on the printed wiring board with a first end positioned near an electronic component attached to the printed wiring
board and a second end positioned near the post.

US Pat. No. 9,140,502

ACTIVE STRUCTURES FOR HEAT EXCHANGER

Hamilton Sundstrand Corpo...

1. A heat exchanger comprising:
a plurality of channels each defining a length; and
a plurality of frame assemblies disposed along the length wherein each frame assembly includes:
a frame extending across the plurality of channels transverse to a primary direction of an incoming flow; and
one or more active flow disruption members configured to actuate in the presence of the incoming flow and affixed to the frame
and extending along the length of the plurality of channels, the one or more active flow disruption members extending along
the primary direction of the incoming flow and the one or more active flow disruption members configured to induce unsteadiness
in the flow through the plurality of channels to increase transfer of thermal energy therein.

US Pat. No. 9,143,070

SYSTEMS AND METHODS FOR CONTROLLING TORSIONAL OSCILLATION IN WOUND FIELD SYNCHRONOUS GENERATOR MACHINES

Hamilton Sundstrand Corpo...

1. A damping controller comprising:
a damping module for damping torsional oscillation in a wound field synchronous generator machine,
wherein the damping module has a synchronous selective compensator for generating a synchronous torsional oscillation compensation
signal, a synchronous notch filter for selecting an asynchronous torsional oscillation compensation signal, and an adder module
operatively coupled to the synchronous selective compensator and the synchronous notch filter for combining the synchronous
torsional oscillation compensation signal and the asynchronous torsional compensation signal, wherein the synchronous notch
filter comprises:

a constant multiplier module coupled to a position sensor;
a speed estimator module coupled to the position sensor;
a high-pass filter module coupled to the speed estimator module;
a first low-pass filter module coupled to the high-pass filter module;
a second low-pass filter module coupled to the high-pass filter module; and
an adder module coupled to the first and second low-pass filter modules for generating an output signal for compensating asynchronous
torsional oscillations in the wound field synchronous generator machine.

US Pat. No. 9,091,212

FUEL AND ACTUATION SYSTEM FOR GAS TURBINE ENGINE

Hamilton Sundstrand Corpo...

1. A method for delivering fuel in an aircraft, the method comprising:
pumping fuel from a storage unit to a boost pump;
pumping fuel from the boost pump to a distribution system using a main pump, wherein a first boost pump line fluidly connects
an outlet of the boost pump to an inlet of the main pump;

pumping fuel from the boost pump to an actuator using a motive pump, thereby providing pumped fuel to the actuator, wherein
actuation power for the actuator is provided by the pumped fuel, wherein a second boost pump line fluidly connects the outlet
of the boost pump to an inlet of the motive pump;

routing fuel from the actuator to the main pump; and
routing fuel from the motive pump to an ejector within the storage unit to circulate fuel within the storage unit.

US Pat. No. 9,093,866

CONFIGURABLE POWER SWITCHING CONTROLLER

Hamilton Sundstrand Corpo...

1. A programmable power switching controller comprising:
a plurality of power channels, each of said power channels including at least a controller, a switching element and a load
output; and

a programming connecter operable to connect the load output of each power channel in a subset of power channels to the output
of each other power channels in said subset, thereby creating a merged power switching controller channel.

US Pat. No. 9,079,261

DETECTING A RELATIVE SHAFT POSITION ON GEARED SHAFTS

Hamilton Sundstrand Corpo...

1. A system, comprising:
a gear assembly including a phonic wheel fixed to a primary gear and a secondary gear rotatably engaged to the primary gear;
a sensor configured to output a signal upon detecting a tooth of the phonic wheel; and
a digital logic circuit configured to detect the signal, to generate a primary gear tooth pulse at intervals corresponding
to intervals of teeth of the primary gear based on the detected signal, and to generate a secondary gear revolution signal
at an interval corresponding to a revolution of the secondary gear based on the primary gear tooth pulse;

wherein the digital logic circuit includes a phonic wheel tooth time counter to count the N teeth of the phonic wheel detected
by the sensor and to calculate a first time period for detecting the N teeth;

wherein the N teeth is a number of total teeth located around a circumference of the phonic wheel; and
wherein the digital logic circuit includes a divider configured to receive from the phonic wheel tooth time counter the first
time period for detecting the N number of teeth and to divide the first time period by Y to generate a second time period,
where Y corresponds to a total number of teeth located around an outer circumference of the primary gear.

US Pat. No. 9,059,647

HIGH VOLTAGE DC POWER GENERATION

Hamilton Sundstrand Corpo...

1. A DC power system, comprising:
a permanent magnet generator (PMG);
an active rectifier in electrical communication with the PMG; and
a controller in electrical communication with the active rectifier, wherein the controller is configured to regulate d-q components
of a stator current of the PMG in a synchronous reference frame,

wherein the controller includes a synchronous current regulator in electrical communication with the active rectifier, and
wherein the synchronous current regulator is configured to provide a pulse width modulation (PWM) scheme to the active rectifier
based on d-q components of reference voltages of the active rectifier, and

wherein the controller further includes a nonlinear voltage regulator in communication with the synchronous current regulator,
and

wherein the nonlinear voltage regulator is configured to provide d-q components of a reference current to the synchronous
current regulator, and

wherein the controller further includes an electrical angle estimator in communication with the PMG and the synchronous current
regulator, and wherein the electrical angle estimator is configured to estimate a speed of the PMG and an angle of power generated
at the PMG, and

wherein the nonlinear voltage regulator is in communication with the electrical angle estimator, and wherein the voltage regulator
is configured to provide d-q components of a feedback voltage output at the active rectifier to the synchronous current regulator,
the d-q components of the feedback voltage output being based on the estimated speed of the PMG and the feedback voltage.

US Pat. No. 9,051,878

ENGINE BEARING COMPARTMENT

Hamilton Sundstrand Corpo...

1. An engine bearing compartment, comprising:
an engine casing defining a discharge pathway for a fluid to drain from the engine bearing compartment,
the discharge pathway having an elevation length extending between upper and lower edges thereof along a longitudinal axis
of the engine casing;

a shaft rotatably disposed within the engine casing to define an annulus;
a housing disposed within the annulus at least partially below the elevation length of the discharge pathway;
an impeller rotatable with the shaft and including a centrifugal element, the impeller being disposed radially inwardly from
the discharge pathway within the annulus such that upper and lower edges of the impeller positionally correspond to the upper
and lower edges of the discharge pathway, respectively, whereby, due to impeller rotation, the centrifugal element expels
the fluid through the discharge pathway from the annulus above the lower edge of the discharge pathway; and

a circuit by which fluid expelled through the discharge pathway is communicated to an interior of the housing.

US Pat. No. 9,502,870

WIRE SUPPORT MEMBER FOR AN ENVIRONMENTAL CONTROL SYSTEM

Hamilton Sundstrand Corpo...

1. A wire support member for an environmental control system, the wire support member comprising:
a first side and a second side;
a first edge, a second edge, and a base edge, the first edge and the second edge forming a V-shaped apex opposite the base
edge;

a first fastener opening having a center C and a diameter D1, a second fastener opening, and a third fastener opening, the first second and third fastener openings extending from the
first side to the second side;

a length L1 from the center C to the first edge and a length L2 from the center C to the second edge; and

wherein a ratio of length L1 to diameter D1 is between 2.0 and 2.3.

US Pat. No. 9,496,085

METHOD OF MANUFACTURING AN INDUCTOR COIL

Hamilton Sundstrand Corpo...

1. A method of forming an inductor coil, the method comprising:
forming a substrate comprising a plurality of recesses in a pottant material;
forming a plurality of core segments;
forming a plurality of windings around each of the plurality of core segments;
arranging the core segments along the substrate such that the windings are arranged within the recesses in the pottant material;
arranging segments along the core segments opposite of the substrate, wherein the segments comprise a second plurality of
recesses in the pottant material;

placing a gap filler between each of the plurality of core segments; and
rolling the plurality of core segments and the substrate into the inductor coil.

US Pat. No. 9,488,174

GEAR PUMP DRIVEN GEAR STATIONARY BEARING

Hamilton Sundstrand Corpo...

1. A gear pump comprising:
a driven gear;
a gear shaft passing through the driven gear;
a stationary journal bearing configured to support the gear shaft during rotation thereof, the gear shaft supported on a fluid
film formed during rotation of the gear shaft, between a surface of the stationary journal bearing and a surface of the gear
shaft;

a hybrid pad recess on the surface of the stationary journal bearing with a minimum leading edge angular location on the stationary
journal bearing of 41.5° in a direction of driven gear rotation relative to a bearing flat, and a maximum trailing edge angular
location on the stationary journal bearing of 54.5° in the direction of driven gear rotation relative to the bearing flat;
and

a porting path for supplying high pressure fluid from a discharge of the gear pump to the hybrid pad recess, the high pressure
fluid supplementing the fluid film during rotation of the gear shaft;

wherein the porting path comprises:
a discharge face cut on the stationary journal bearing for receiving the high pressure fluid from the discharge of the gear
pump;

a radial spool cut on the stationary journal bearing;
an axial hole through the stationary journal bearing for communicating the high pressure fluid from the discharge face cut
to the radial spool cut; and

a capillary port extending through the stationary bearing from the radial spool cut to the hybrid pad recess for delivering
the high pressure fluid from the radial spool cut to the hybrid pad recess.

US Pat. No. 9,473,040

SYSTEMS AND METHODS FOR CONTROLLING ACTIVE RECTIFIERS

Hamilton Sundstrand Corpo...

1. A method of controlling a rectifier, comprising:
receiving a gain factor;
receiving a ramp interval;
over-modulating a rectifier switch control voltage generated by a pulse width modulator using the gain factor;decreasing over-modulation of the rectifier switch control voltage during the ramp interval by reducing the gain factor;
detecting an end of regulation;
disabling the pulse width modulator; and
passively rectifying received AC voltage.

US Pat. No. 9,415,880

ACTUATOR FOR RAT DEPLOYMENT

Hamilton Sundstrand Corpo...

12. A method for operating an actuator assembly having a piston and a housing, the method comprising:
delivering actuation force between the piston and the housing with a first coil spring over a first portion of an overall
piston actuation stroke;

disengaging the first coil spring from the housing over a remaining portion of the overall piston actuation stroke, following
the first portion of the overall piston actuation stroke, wherein the step of moving the first coil spring out of engagement
with the housing over a remaining portion of the overall piston actuation stroke comprises:

sliding a spring guide such that the spring guide travels with the piston; and
delivering actuation force between the piston and the housing with a second coil spring over the entire overall piston actuation
stroke.

US Pat. No. 9,393,652

TURBINE HOUSING

HAMILTON SUNDSTRAND CORPO...

1. A turbine housing, comprising:
a turbine inlet plenum;
a turbine housing body comprising a turbine outlet mounting face, a seal plate mounting face, and a center bore formed between
the turbine outlet mounting face and the seal plate mounting face;

a first support formed about the turbine inlet plenum and in contact with the turbine housing body; and
a relief pocket formed in the first support proximate the seal plate mounting face, the relief pocket formed at a first distance
from a turbine housing center axis of the center bore and at a first depth relative to the seal plate mounting face, wherein
a ratio of the first distance to the first depth is between 2.66 and 2.90.

US Pat. No. 9,325,212

MOTOR INCLUDING FLEXIBLE PRINTED CIRCUIT BOARD STATOR

HAMILTON SUNDSTRAND CORPO...

1. An electric motor, comprising:
a motor stator comprising a flexible printed circuit, wherein the flexible printed circuit comprises a plurality of coils,
the flexible printed circuit forming a truncated cone shape;

a housing that supports a motor rotor comprising a plurality of permanent magnets, wherein the motor rotor is spaced apart
from the flexible printed circuit; and

a power signal connected to the plurality of coils and configured to power the plurality of coils, wherein the electric motor
is configured to rotate the motor rotor around the motor stator during application of power to the plurality of coils;

a printed circuit board attached to a shaft and electrically coupled to the flexible printed circuit, wherein the printed
circuit board is in electrical commutation with the flexible printed circuit board so as to deliver the power signal to the
plurality of coils,

wherein the plurality of permanent magnets are interposed between the housing and the flexible printed circuit, and having
a shape that matches the shape of the flexible printed circuit to form a truncated cone shape such that a surface area of
the coils on the stator and the permanent magnets is maximized to improve at least one of motor torque and motor speed.

US Pat. No. 9,279,509

VALVE WITH PRECISION MOUNTED HINGE PIN POSTS

Hamilton Sundstrand Corpo...

1. A valve comprising:
a housing with a flow passage and a hole extending into the housing;
a post non-integral with the housing, the post having a base, a hinge pin opening, and a hole extending into the base from
the hinge pin opening, the post connected to the housing;

a hinge pin at least partially within the hinge pin opening; and
a dowel pin which sits in the hole of the housing and extends through the hole in the post into the hinge pin opening,
wherein the hinge pin has a completely circumferential groove to receive the dowel pin.

US Pat. No. 9,222,596

FAULT TOLERANT AIRFLOW CONTROL SYSTEM

Hamilton Sundstrand Corpo...

1. An airflow control system for controlling pressure and flow through a flow passage with an upstream portion and a downstream
portion, the system comprising:
a valve which can open to different positions for controlling pressure at the downstream portion of the flow passage;
a valve actuator which receives electrical signals to control the opening and closing of the valve, the valve actuator including:
a first cylinder;
a first piston with a first side and a second side for moving through the first cylinder;
a second cylinder connected to the first cylinder;
a second piston with a first side and a second side for moving through the second cylinder, and connected to the first piston
to move with the first piston;

a first pressure chamber defined by the first cylinder and the first side of first piston;
a second pressure chamber defined by the second side of the first piston and the first side of the second piston;
a third pressure chamber defined by the second cylinder and the second side of the second piston;
a torque motor to control pressure in the first pressure chamber to move the first piston by modulating a restrictor to allow
pressure to flow out of the first pressure chamber into an area of ambient pressure, the torque motor configured to prevent
flow from the first pressure chamber into the area of ambient air in the event that the torque motor is not receiving power;

an actuator flow passage connecting the upstream portion of the flow passage to the torque motor and to the third pressure
chamber to supply pressure to the torque motor and to the third pressure chamber; and

an actuator shaft connecting the valve to the first piston and the second piston to translate movement of the first piston
and the second piston into a change of the valve position; and

a pneumatic feedback system to stabilize the valve actuator.

US Pat. No. 9,196,416

BOBBINS FOR GAPPED TOROID INDUCTORS

Hamilton Sundstrand Corpo...

1. An inductor assembly, comprising:
a bobbin with an interior spacer, defining:
an exterior surface for coupling the interior spacer with an inductor core; and
an opposed interior facing surface for receiving inductor windings, wherein the interior spacer has a convex surface defined
between the exterior and interior surfaces thereof;

the inductor core being disposed radially outward of the bobbin and interrupted with a circumferential gap, the interior spacer
being coupled to an interior surface of the inductor core and disposed radially inward of the gap; and

first and second winding portions being disposed over the convex surface defined by the interior spacer and offset radially
by the thickness profile of the interior spacer, the thickness profile offsetting the first winding portion radially inward
by a distance greater than a radial offset of the second winding portion.

US Pat. No. 9,175,694

AIR COOLED MOTOR CONTROLLERS

Hamilton Sundstrand Corpo...

1. An air cooled motor controller, comprising:
a substrate;
at least one inductor assembly arranged on the substrate, wherein the at least one inductor assembly includes an outer cylindrical
housing, a wound inductor core arranged within the outer cylindrical housing, and an inner cylindrical housing arranged within
the wound inductor core, wherein the inner cylindrical housing defines an inner cylindrical cavity that transmits air, and
wherein the outer cylindrical housing and the inner cylindrical housing define at least one cylindrical gap in fluid communication
with the inner cylindrical cavity and that transmits air;

at least one air source in fluid communication with the at least one cylindrical gap;
wherein the air plenum comprises:
a first airflow chamber in fluid communication between the at least one air source and the at least one cylindrical gap; and
a second airflow chamber in fluid communication with the inner cylindrical cavity and that transmits exhaust air from the
inner cylindrical cavity.

US Pat. No. 9,151,429

FLOW RESTRICTOR

Hamilton Sundstrand Corpo...

3. A flow assembly comprising:
a flow passage extending between a first end and a second end;
an inlet formed in the flow passage between the first end and the second end of the flow passage;
a flow restrictor seat disposed along the flow passage between the inlet and the second end of the flow passage;
a flow restrictor disposed in the flow passage between the first end of the flow passage and the flow restrictor seat, the
flow restrictor comprising:

a first disc disposed between the inlet and the flow restrictor seat and against the flow restrictor seat;
a second disc disposed between the first end of the flow passage and the inlet;
a rod extending between the first disc and the second disc, the rod spacing the first disc from the second disc;
a first hole formed in the first disc; and
a second hole formed in the second disc.

US Pat. No. 9,136,742

ROTOR GEAR MOUNTING ASSEMBLY FOR A GENERATOR AND METHOD

Hamilton Sundstrand Corpo...

1. A rotor gear mounting assembly for a generator comprising:
a rotor shaft comprising a first end and a second end;
a magnetic member arrangement operatively coupled to the rotor shaft proximate at least one of the first end and the second
end;

a hub portion of the magnetic member arrangement, wherein the rotor shaft comprises a shaft outer surface having a first diameter,
and wherein the hub portion comprises a hub outer surface having a second diameter that is less than the first diameter; and

a rotor gear operatively coupled to the hub portion.

US Pat. No. 9,136,639

ELECTRICAL CONNECTOR RECEPTACLE FOR MOUNTING WITHIN AN EXPLOSION PROOF ENCLOSURE AND METHOD OF MOUNTING

Hamilton Sundstrand Corpo...

1. An explosion proof enclosure comprising:
an electrical connector comprising:
a flange portion having a first side, a second side and a centrally disposed aperture extending therethrough from the first
side to the second side;

a cylindrical member integrally formed with the flange portion and extending away from the first side of the flange portion;
a plurality of apertures extending through the flange portion from the first side to the second side, wherein the plurality
of apertures are configured to receive a mechanical fastener for mounting the electrical connector receptacle to a printed
wiring board;

an o-ring groove disposed within the first side of the flange portion and spaced radially outwardly from an outer surface
of the cylindrical member, the o-ring groove forming a recessed region relative to the first side of the flange portion; and

a plurality of mounting feet integrally formed with the flange portion and extending away from the second side of the flange
portion to form an electrical bonding path to the printed wiring board.

US Pat. No. 9,057,386

RAM AIR FAN INNER HOUSING

Hamilton Sundstrand Corpo...

1. A ram air fan inner housing for a ram air fan assembly, the inner housing comprising:
a center body housing comprising:
a bearing housing connection at one end of the center body housing, the bearing housing connection having a cylindrical shape
and disposed symmetrically about an axis of the inner housing;

a cooling air inlet having a cylindrical shape at an end of the center body opposite the bearing housing connection; and
a cooling duct between the bearing housing connection and the cooling air inlet, the cooling duct comprising:
a first cone attachment surface adjacent to the bearing housing connection, the first cone attachment surface having a frustoconical
shape and disposed symmetrically about the axis of the inner housing;

an end cup attached to the center body housing, the end cup comprising:
a cooling air connector for connecting the end cup to the cooling air inlet;
a second cone attachment surface having a frustoconical shape and disposed symmetrically about the axis of the inner housing;
and

a cooling tube recess between the cooling air connector and the second cone attachment surface, the cooling tube recess for
connecting a motor bearing cooling tube;

a perforated cone having a frustoconical shape and disposed axially about the center body housing;
wherein the perforated cone is attached to the center body housing at the first cone attachment surface and attached to the
end cup at the second cone attachment surface such that the perforated cone extends away from the first cone attachment surface
and radially inward toward the axis of the inner housing.

US Pat. No. 9,057,407

DISCONNECT ASSEMBLY

Hamilton Sundstrand Corpo...

1. A disconnect assembly, comprising:
a housing;
a rotatably drivable input shaft including a first portion, a second portion extending from the first portion into the housing
and a first clutch portion disposed along the second portion;

a rotating element housed within the housing and including a second clutch portion, which is movable between a first position,
at which the first and second clutch portions drivably register with each other, and a second position, at which the first
and second clutch portions are displaced from each other; and

a disconnect bearing disposed at an inner diameter of the first clutch portion and configured to radially and axially secure
the input shaft relative to the rotating element with the second clutch portion disposed in the first or second position,

the disconnect bearing comprising a sleeve bearing, forward and aft thrust bearings respectively disposed at forward and aft
ends of the sleeve bearing and a journal disconnect bearing disposed in a region partially bounded by the forward and aft
thrust bearings, the sleeve bearing and the inner diameter of the first clutch portion.

US Pat. No. 9,601,975

HIGH ALTITUDE, HIGH VOLTAGE REAR TERMINAL BLOCK ASSEMBLY

Hamilton Sundstrand Corpo...

1. A method of assembling a generator terminal block assembly comprising first and second terminal block assemblies on a generator
housing, the method comprising:
providing a cable having first and second ends, with the first end secured to the first terminal block assembly;
securing a bus bar between first and second terminal studs of the second terminal block;
arranging a lug on the second end of the cable onto a terminal stud of the second terminal block assembly where the second
terminal block assembly includes a terminal surface corresponding to the first lug with a length greater than a length of
the first lug;

arranging a second lug of a second cable onto the second terminal stud of the second terminal block; and
clamping the first and second lugs to corresponding ones of the first and second terminal studs.

US Pat. No. 9,502,723

METHOD OF OPERATING A FUEL CELL IN CONFINED SPACE

Hamilton Sundstrand Corpo...

1. A method of operating a fuel cell in a vehicle comprising the steps of:
initially charging a waste tank with a gas other than air, and that is absorbable and inert in water;
passing a supply of fuel across one electrode in the fuel cell, and a supply of oxygen containing gas across another electrode
generating water from operation of the fuel cell; and

then delivering the water into the waste tank.

US Pat. No. 9,494,225

ELECTRIC GENERATOR OIL PUMP DRIVEN GEAR

Hamilton Sundstrand Corpo...

1. A driven gear to drive an oil pump for a generator comprising:
a driven gear including a radially outwardly extending flange, said radially outwardly extending flange extending along an
axial distance defined along a center axis of said flange, said flange merging into a generally conical portion which, in
turn, extends radially inwardly to a hub, said hub extending to a remote end, and a first distance defined between said remote
end of said hub and an end of said flange facing said remote end, and a second distance defined between ends of said flange,
with gear teeth formed at an outer periphery of said flange;

a ratio of said first distance to said second distance being between 2.54 and 2.82; and
wherein said gear teeth have a flat outer end and curved sides, with there being four roll angles on each of said sides, with
a first roll angle extending for 13.4° to 15.4°, a second roll angle extending for 15.7° to 17.7°, a third roll angle extending
for 22.5° to 24.5°, and a fourth roll angle extending for 24.8° to 26.8°.

US Pat. No. 9,472,996

TERMINAL ASSEMBLY

Hamilton Sundstrand Corpo...

1. A terminal board comprising:
a base portion with a length;
a plurality of terminals extending from the base portion; and
a plurality of barriers extending from the base portion between terminals and having a barrier spacing distance between each
barrier; wherein the ratio of length to barrier spacing distance is at least 5.124:1.

US Pat. No. 9,435,263

THERMAL STRESS REDUCTION IN AIRCRAFT MOTOR CONTROLLERS

HAMILTON SUNDSTRAND CORPO...

4. An engine start system, comprising:
an electric power generator having a three-level inverter switch arra3˜;

an aircraft engine coupled to the electric power generator;
an aircraft motor controller coupled to the electric power generator,
wherein the motor controller configured for:
ramp the electric power generator to start the aircraft engine; and
during a time period associated with the aircraft engine start sequence, applying a current profile to the current from the
electric power generator to the aircraft engine, the current profile controlling the current to reduce the thermal dissipation
in the three-level inverter switch; toggling the three-level inverter switch array to a three-level pulse width modulation
(PWM) mode; determining if a first time interval in the three-level PWM mode exceeds a predetermined three-level PWM mode
interval; toggling the three-level inverter switch array to a two-level PWM mode, in response to the first time interval exceeding
the three-level PWM mode interval; determining if a second time interval in the two-level PWM mode exceeds a predetermined
two-level PWM mode interval; and toggling the three-level inverter switch array to the three-level PWM mode, in response to
the second time interval exceeding the two-level PWM mode interval;

wherein the three-level inverter switch array includes a first switch, a second switch, a third switch and a fourth switch
wherein the first switch, the second switch, the third switch and the fourth switch are configured in a serial arrangement

the array including: a three-level PWM mode includes alternating between switching on the first switch and the third switch
while applying a PWM signal to the second switch and the fourth switch, and switching on the second switch and the fourth
switch while applying a PWM signal to the first switch and the third switch,

a two-level PWM mode includes turning on the first switch and the fourth switch while applying a PWM signal to the second
switch and the third switch, and

a carrier frequency in the two-level PWM mode is greater than a carrier frequency in the three-level PWM mode.

US Pat. No. 9,347,573

CHECK VALVE WITH REDUCED OPENING SPEED

Hamilton Sundstrand Corpo...

1. A check valve with adjacent first and second apertures separated by a septum, the check valve comprising:
a hinge pin located downstream of the septum;
a first flapper anchored via the hinge pin, and rotatable about the hinge pin to block the first aperture when in a closed
position;

a second flapper anchored via the hinge pin, the second flapper comprising:
a primary flapper section rotatable about the hinge pin to block the second aperture when in a closed position; and
a counterbalance section extending upstream from and substantially parallel to the primary flapper section, towards the first
aperture; and

a stop pin situated downstream of the hinge pin, and disposed to halt opening of the first flapper and the second flapper,
such that the first and second flappers contact the stop pin in a fully open position.

US Pat. No. 9,322,732

STRAIN GAUGE PRESSURE SENSOR CIRCUIT WITH SENSOR DISCONNECT DETECTION

Hamilton Sundstrand Corpo...

1. A circuit comprising:
a strain gauge pressure sensor having signal terminals that provide an analog differential sensor signal as a function of
sensed pressure;

a filter circuit connected to the strain gauge pressure sensor signal terminals for low-pass filtering the analog differential
sensor signal;

a conversion circuit for converting the low-pass filtered analog differential sensor signal to a digital pressure value representative
of the sensed pressure; and

a disconnect detection circuit for providing a detection signal that indicates when the strain gauge pressure sensor is disconnected
based on a low-frequency common mode voltage associated with one of the signal terminals of the strain gauge pressure sensor,

wherein the disconnect detection signal is a differential disconnect detection signal based on the low-frequency common mode
voltage and a reference voltage.

US Pat. No. 9,279,386

JET NOISE REDUCTION USING EDUCTION EFFECT

Hamilton Sundstrand Corpo...

1. An exhaust duct through which an exhaust gas jet from a gas turbine engine flows, the exhaust duct comprising:
a duct wall, the duct wall comprising:
an inlet at an upstream end of the duct wall through which the exhaust gas jet enters the exhaust duct; and
an outlet at a downstream end of the duct wall through which the exhaust gas jet exits the exhaust duct;
an outer wall circumscribing the duct wall;
a barrier wall extending radially from the duct wall to the outer wall to isolate an engine compartment from an ingestion
chamber, wherein a portion of the outer wall bounding the ingestion chamber has a plurality of apertures that place the ingestion
chamber in communication with an ambient environment; and

an eductor positioned proximate the downstream end, the eductor comprising:
a perforated wall segment through which ambient air from the ingestion chamber is permitted to enter the exhaust duct.

US Pat. No. 9,197,138

VOLTAGE STEP-UP SIX-PHASE AUTOTRANSFORMER PASSIVE RECTIFICATION AC-DC CONVERTER

HAMILTON SUNDSTRAND CORPO...

1. A rectifier system comprising:
a twelve pulse step-up autotransformer configured to receive a three phase AC input and produce a six phase, 12 pulse AC output;
a first rectifier configured to receive three phases of the six phase AC output and generate a first DC output;
a second rectifier configured to receive the remaining three phases of the six phase AC output and generate a second DC output;
and

an interphase transformer configured to receive the first DC output and the second DC output and to generate a combined DC
output,

wherein the step-up autotransformer is a
ratio autotransformer.

US Pat. No. 9,188,022

ELECTRICAL POWER TRANSFER SYSTEM FOR PROPELLER SYSTEM

Hamilton Sundstrand Corpo...

1. A propeller system for an aircraft comprising:
a propeller assembly rotatable about a central axis;
a reduction gearbox operably connected to the propeller assembly via a propeller shaft; and
an electrical power transfer system positioned such that the gearbox is located axially between the electrical power transfer
system and the propeller assembly and including:

a slip ring assembly operably connected to an oil transfer tube extending to the propeller assembly;
a brush block interactive with the slip ring assembly to transfer electrical power to a plurality of lead wires extending
from the slip ring assembly to the propeller assembly, the brush block positioned such that brush block tips of the brush
block extend toward the slip ring assembly in a substantially axial direction relative to the central axis;

a slip ring plate affixed to a slip ring tube operably connected to the oil transfer tube via a slip ring drive tab;
a slip ring bearing supportive of the slip ring tube; and
a plurality of slip rings affixed to a plate face of the slip ring plate.

US Pat. No. 9,493,243

AMBIENT CONDITION BASED ADJUSTING OF CABIN PRESSURE TO ACHIEVE TARGET AIRCRAFT INFLOW

HAMILTON SUNDSTRAND CORPO...

1. A method, comprising:
receiving a number of occupants on an aircraft at a processing device;
monitoring, by the processing device, ambient conditions on the aircraft;
determining with the processing device an occupant threshold limit for the aircraft based on the ambient conditions;
signaling a cabin pressure controller to reduce cabin pressure in the aircraft when the number of occupants exceeds the occupant
threshold limit; and

resetting the cabin pressure in the aircraft in response to the occupant threshold limit increasing due to changing ambient
conditions;

wherein the occupant threshold limit is a number of occupants that can be supported by a flow source without exceeding a maximum
cabin temperature, the occupant threshold limit a function of ambient temperature, altitude and aircraft speed.