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* ARINC - aeronautical radio incorporated
* BITE - built in test equipment
* capt - captain
* CSMU - crash survivable memory unit
* D/A - digital-to-analog
* F/O - first officer
* F/OBS - first observer
* Hz - hertz
* mic - microphone
* REU - remote electronics unit
* ULB - underwater locator beacon
* V AC - volts alternating current
* V DC - volts direct current
* VR - voice recorder
* xfr - transfer
VOICE RECORDER SYSTEM - INTRODUCTION
EFFECTIVITY
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VOICE RECORDER SYSTEM - INTRODUCTION
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General
The voice recorder unit makes a continuous record of flight
crew communication and flight compartment sounds. It erases
the communication data automatically so that the memory
stores only recent audio.
The voice recorder unit keeps the last 120 minutes of
communication data in memory.
The voice recorder unit receives audio from the remote
electronics unit (REU) and the area microphone. The area
microphone is in the cockpit voice recorder panel.
The voice recorder unit receives time from the clock system for
reference.
Components
The voice recorder system has these components:
* Cockpit voice recorder panel
* Voice recorder unit.
Functional Description
The voice recorder unit collects these audio at the same time:
* Captain microphone and headphone
* First officer (F/O) microphone and headphone
* First observer (F/OBS) microphone and headphone
* Area microphone on the cockpit voice recorder panel.
The voice recorder unit also receives time from the clock
system.
The inputs from the captain, first officer, and first observer
microphones go to the REU. The REU mixes each station
microphone audio with that station headphone audio. The REU
then increases the audio signal and sends it to the voice
recorder.
The area microphone collects flight compartment sounds, such
as voices and aural warnings. The cockpit voice recorder panel
increases the audio signal from the area microphone and sends
it to the voice recorder unit.
You can monitor the voice recorder recorded audio if you
connect a headphone to the phone jack at the cockpit voice
recorder panel.
An erase switch on the voice recorder control panel removes all
the audio that the voice recorder keeps. You can only erase
data when the airplane is on the ground and the parking brake
is set.
A test switch on the cockpit voice recorder panel starts a test of
the voice recorder system. A status indicator LED on the cockpit
voice recorder panel shows the results of the test.
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An underwater locator beacon is on the front panel of the voice
recorder unit.
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EFFECTIVITY
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General
The cockpit voice recorder panel is on the P5 forward overhead
panel.
The captain clock is on the P1 captain instrument panel.
VOICE RECORDER SYSTEM - FLIGHT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
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