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2 Description of Cockpit Voice Recorder        

The Beech 1900C examined in this paper did not have a flight data recorder; however, it did have a B&D Instruments Cockpit Voice Recorder (serial number AO1165).  “This CVR is a direct-record, thirty-minute endless-loop, four-track audio recorder operating at  inches-per-second (IPS) [8].”  Two channels record the voice microphones for the pilot and co-pilot, one channel is mounted into the cockpit itself and used as a cockpit area microphone (CAM), and a final channel is run through the plane but linked only to the public address (PA) system.  The wires for all of these microphones were run in a bundle down the right of the fuselage to the CVR, which was located in the tail of the plane [9].  The CVR tape was originally digitized at 44,100 samples per second.  For a more detailed description of the CVR, see reference 8 listed at the end of this report.

 

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