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Heat shielded memory unit for an aircraft flight data recorder

  • US 4,694,119 A
  • Filed: 12/31/1984
  • Issued: 09/15/1987
  • Est. Priority Date: 09/07/1983
  • Status: Expired due to Term
First Claim
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1. An enclosure for thermally protecting one or more heat sensitive items from a high temperature environment, said enclosure comprising:

  • a metal outer housing including an interior cavity for containing said one or more heat sensitive items;

    a first thermal insulator configured as a thermal liner that extends about the surface of said first interior cavity, said thermal liner defining a second interior cavity with said one or more heat sensitive items being spaced apart from the walls of said second interior cavity said first thermal insulator being a solid material and remaining solid when said enclosure is exposed to a high temperature environment; and

    an amide wax, said wax occupying at least a portion of said interior cavity and encapsulating said one or more heat sensitive items said amide wax exhibiting a phase transition at a predetermined temperature, said predetermined temperature being selected to maintain said amide wax in a solid phase when said enclosure is not exposed to said high temperature environment and being selected to allow conversion of said amide wax to a liquid phase when said enclosure is exposed to said high temperature environment.

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