1. A system, comprising:a memory core of a flight recorder;
an inner chamber housing the memory core;
an outer chamber housing the inner chamber with a vacuum between the inner chamber and the outer chamber;
a signal path from avionics equipment to the memory core through the outer chamber and the inner chamber; and
a power path for the memory core through the outer chamber and the inner chamber;
wherein an outer surface of the inner chamber is coated with a silvering material configured to reflect radiant heat.