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Aa77 Fdr Was Solid State, Cvr Was Magnetic Tape. Why The Two Versions?

TheSurgeon
post Feb 2 2012, 10:43 AM
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Group: Student Forum Pilot
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AA77 FDR was Solid State, CVR was Magnetic Tape. Why the two versions?


I'm researching AA77's black boxes and am very curious why the Flight Data Recorder (FDR) was a L-3 Communications, Fairchild Aviation Recorders model FA2100, which is solid state;

and,

the Cockpit Voice Recorder (CVR) was a L-3 Communications, Fairchild Aviation Recorders model A-100A, which has magnetic tape.

QUOTE
Officials at both American Airlines and United Airlines said the black boxes aboard their doomed planes were modern solid state versions. Such devices are more resistant to damage than older magnetic tape recorders.


If AA77 was upgraded (or originally manufactured) with a Solid State Flight Data Recorder (SSFDR), wouldn't the CVR also be a solid state version? Specifically the model FA2100 Cockpit Voice Recorder.

And, why not use the FA2100 Cockpit Voice and Data Recorder (CVDR) which is a combined unit?

FA2100 CVDR
L-3 Aviation Recorders
L-3 Communications: History of Flight Recorders

Did the government show us an old version of the CVR (model A-100A)? One that was no longer actually used in the 737-223

Any info would be appreciated.
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