Heat shielded memory unit for an aircraft flight data recorder

Details Heat shielded memory unit for an aircraft flight data recorder Heat shielded memory unit for an aircraft flight data recorder

1984-12-31

1987-09-15

Grimley, Arthur T.

Electricity: conductors and insulators

Boxes and housings

Hermetic sealed envelope type

169 48, 220 88R, H05K 504

Patent

active

046941193

ABSTRACT:
Solid state memory devices employed in crash survivable flight data recorders must be thermally insulated to prevent loss of stored data if the aircraft burns. To provide adequate thermal isolation at minimal size, the solid state electronic memory devices (26) are encapsulated in a synthetic organic wax or pentaerythritol (28) that exhibits a phase transition at a temperature: (a) above the normal operating temperature of the memory unit (10); and below the maximum acceptable peak temperature for the memory devices (26). The synthetic organic wax of pentaerythritol (28) is surrounded by a thermal liner (18) constructed of solid thermal insulating material. A metal enclosure (12) houses and protects the thermal liner (18), the synthetic organic was or pentaerythritol (28) and the memory devices (26).

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