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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-71-00-003
VOICE RECORDER SYSTEM - FLIGHT COMPARTMENT COMPONENT LOCATION
VOICE RECORDER SYSTEM - FLIGHT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
SHZ ALL 23-71-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-71-00-003
General
The voice recorder unit is in the aft cargo compartment just aft
of the cargo door.
VOICE RECORDER SYSTEM - RECORDER LOCATION
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-71-00-004
VOICE RECORDER SYSTEM - RECORDER LOCATION
VOICE RECORDER SYSTEM - RECORDER LOCATION
EFFECTIVITY
SHZ ALL 23-71-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-71-00-004
Power
The voice recorder unit gets 115v ac from the voice recorder
circuit breaker. The voice recorder unit supplies 18v dc to the
audio amplifier in the cockpit voice recorder panel.
Cockpit Voice Recorder Panel
The cockpit voice recorder panel sends these signals:
* Erase discrete to the voice recorder
* Test discrete to the voice recorder
* Area audio to the channel 4 input of the voice recorder.
PSEU
The poximity switch electronics unit (PSEU) gets 30v dc from the
voice recorder unit. A park and ground relay in the PSEU closes
when the parking brake is set and the airplane is on the ground.
When it closes, the relay sends 30v dc to the erase switch on the
cockpit voice recorder panel.
Remote Electronics Unit
The remote electronics unit (REU) sends these signals to the
voice recorder unit:
* Observer audio
* First officer (F/O) audio
* Captain audio.
Clock
Clock data from the captain clock goes to the voice recorder on
an ARINC 429 data bus.
Voice Recorder Unit
The voice recorder unit sends 30v dc to the park and squat
ground sensing relay. It also sends these signals to the cockpit
voice recorder panel:
* Test indication to the monitor indicator
* Monitor/test audio to the headphone jack.
VOICE RECORDER SYSTEM - INTERFACE
EFFECTIVITY
SHZ ALL 23-71-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-71-00-005
VOICE RECORDER SYSTEM - INTERFACE
VOICE RECORDER SYSTEM - INTERFACE
EFFECTIVITY
SHZ ALL 23-71-00
Page 13
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-71-00-005
Purpose
The voice recorder unit continuously records these:
* Time
* Flight crew communications
* Flight compartment sounds.
Physical Description
The container for the voice recorder unit has these properties:
* Watertight
* Shock resistant
* Heat resistant.
The voice recorder unit has an underwater locator beacon
(ULB) on the front panel. The ULB helps find the voice recorder
unit in water.
The voice recorder unit has a BITE indicator on the front panel.
This indicator comes on when there is a voice recorder unit
fault.
VOICE RECORDER SYSTEM - VOICE RECORDER UNIT
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-71-00-006
VOICE RECORDER SYSTEM - VOICE RECORDER UNIT
VOICE RECORDER SYSTEM - VOICE RECORDER UNIT
EFFECTIVITY
SHZ ALL 23-71-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-71-00-006
Purpose
You can do these functions at the cockpit voice recorder panel:
* Monitor the recorded audio
* Erase the recorded audio
* Test the voice recorder system.
Features
The cockpit voice recorder panel has these controls and
indicators:
* Status indicator
* Erase switch
* Test switch
* Headphone jack.
The status indicator shows the test results.
You can erase the audio with the ERASE switch if the airplane is
on the ground and the parking brake is set.
　
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