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The TEST switch starts a BITE test.
You can monitor the four audio channels at the headset jack.
An area microphone sends flight compartment sounds to the
voice recorder.
VOICE RECORDER SYSTEM - COCKPIT VOICE RECORDER PANEL OPERATION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-71-00-007
VOICE RECORDER SYSTEM - COCKPIT VOICE RECORDER PANEL OPERATION
VOICE RECORDER SYSTEM - COCKPIT VOICE RECORDER PANEL OPERATION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The underwater locating device (ULD) is an ultrasonic beacon. It
makes the cockpit voice recorder (CVR) easier to find if it is
under water.
Physical Description
The ULD is a line replaceable unit that is 1.3 inches (3.3 cm) in
diameter and 4 inches (10.2 cm) long. It weighs less than 12
ounces (0.34 kg).
Functional Description
The ULD has these operation characteristics:
* Operates when it is put into water
* Operates to a maximum depth of 20,000 feet (6096 meters)
* Has a detection range of 7,000 (2134 meters) to 12,000 feet
(3658 meters)
* Can operate under water for a minimum of 30 days
* Sends out an acoustic pulse tone of 37.5 khz at a rate of one
pulse-per-second.
Training Information Point
You replace the underwater locator beacon or the battery on or
before the date shown on the replacement label.
VOICE RECORDER SYSTEM - UNDERWATER LOCATOR BEACON
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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VOICE RECORDER SYSTEM - UNDERWATER LOCATOR BEACON
VOICE RECORDER SYSTEM - UNDERWATER LOCATOR BEACON
EFFECTIVITY
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General
The voice recorder system receives flight compartment sounds
and flight crew communications. It keeps this audio in a solid
state memory. The voice recorder system has these modes of
operation:
* Normal
* Test
* Erase.
Normal Operation
The voice recorder operates continuously when the airplane
has power and the voice recorder circuit breaker is closed.
Four audio channels go to the voice recorder. The remote
electronics unit gives audio to channels 1, 2, and 3. Each
channel gets audio from one person in the flight crew. The
audio on each channel is the sum of these signals:
* Hot mic audio (microphone audio without push-to-talk)
* Received audio that crew members select on an audio
control panel (ACP)
* Sidetone audio to the crew member.
Channel 4 audio is from the area microphone on the cockpit
voice recorder panel. The area microphone sends flight
compartment audio to the voice recorder unit. The
preamplifier in the cockpit voice recorder panel gets 18v dc
from the voice recorder unit. The preamplifier increases the
strength of the channel four audio.
All the audio that the voice recorder unit receives goes to the
voice recorder controller. The controller has these functions:
* Changes the audio signals to digital
* Changes the digital signals to audio
* Controls the audio record process
* Controls the self test.
The analog-to-digital (A/D) circuits change the four input audio
signals to digital data. The processor sends the digital data to
the crash survivable memory unit (CSMU). The CSMU records
the digital data.
The processor sends a memory address to the CSMU on the
address bus. The memory address tells the CSMU where to
keep the digital audio data.
The processor mixes the four digital data words from the A/D
circuits. The mixed signal goes to the digital to analog (D/A)
circuits. The D/A circuits change the digital data to audio. The
mixed audio goes to the headphone jack on the cockpit voice
recorder panel.
VOICE RECORDER SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-71-00-009
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