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Wed, 13 Aug 1997 11:40:49 EDT |
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George,
At 09:26 AM 8/13/97 -0400, you wrote:
>I am also looking for any requirement specs.
>If a Boeing Engineer wanted to place some electronics near the engines,
>vibration should be expected and taken into consideration at design. Is
>there a design/production spec for circuit card assemblies which include
>requirements to meet some vibration/shock criteria? How are these
>requirements invoked now that Mil-C-28809B is gone?
Generally, vibration and shock requirements are applicable to an entire
assembly (e.g. a chassis populated with boards) and not just circuit cards
since the entire assembly is what is actually exposed to the vibration and
shock environment in field usage.
>What shock and vibration requirements are placed on the famous Flight Data
>Recorders searched for and recovered after airline crashes? They have
>boards in them, right?
Flight Data Recorders and Cockpit Voice Recorders consist of a chassis with
circuit cards and a crash housing which has either tape or solid state
memory (on small circuit cards) inside. RTCA DO-160C details the
environmental requirements (including vibration) for the recorders and the
more intense crash survival testing requirements for the crash housings.
Brian Hyde
Reliability Engineer
L-3 Communications Aviation Recorders
E-mail: [log in to unmask]
--------------------------------------------
Brian P. Hyde
Reliability Engineer
L-3 Communications
Aviation Recorders Division
(941)371-0811, ext. 5136
E-Mail: [log in to unmask]
--------------------------------------------
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