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23-61-01
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A
757 MAINTENANCE MANUAL
VOICE RECORDER SYSTEM - DESCRIPTION AND OPERATION
_________________________________________________
1. General_______
A. The voice recorder system preserves a continuing record of the latest 30 minutes of flight crew communications and conversations. The four recording channels receive inputs from the captain, the first officer, the first observer and from an area microphone in the flight compartment.
B. The voice recorder system consists of either a tape based or solid state recorder located in the aft passenger cabin ceiling and a control panel with an area microphone located in the flight compartment on overhead panel P5.
C. The voice recorder system receives 115 VAC power from the right main AC bus. Power to the system is controlled by the VOICE RECORDER circuit breaker located on overhead panel P11.
2. Component Details (Fig. 1)__________________________
A. Voice Recorder Control Panel
____________________________
(1)
The voice recorder control panel is located on overhead panel P5. It contains an area microphone with preamplifier and filter circuits, a phone jack to monitor system recording through headsets, a TEST switch to initiate the functional self test, a MONITOR meter or a STATUS light to provide an indication of self test success or failure, and an ERASE switch.
(2)
LORAL/FAIRCHILD VOICE RECORDER CONTROL PANEL; When the TEST switch is pushed it activates test circuits within the voice recorder. A 600-Hz modulated tone is sequenced to each channel of the voice recorder. System operation is monitored by a single pulse meter needle deflection on the monitor meter and a modulated sound from the HEADSET jack.
(3)
When the ERASE switch is pushed for more than two seconds, it causes the voice recorder data to be completely erased. Bulk erasure is possible only when the airplane is on the ground with the parking brake set.
B. Voice Recorder
______________
(1)
The voice recorder is installed in an equipment rack in the aft passenger cabin ceiling.
(2)
AIRPLANES WITH LORAL/FAIRCHILD TAPE BASED VOICE RECORDER; The unit contains a tape transport which includes the tape, tape drive, four recording heads, erase head, monitor head, and bulk erase coil. The unit also contains four recording amplifiers, a monitor amplifier, 65-KHz bias generator, 600-Hz test circuits and power supply.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
23-71-00
ALL ú ú 12 Page 1 ú Jan 20/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
P11 PANEL
P5 PANEL
VOICE AND FLIGHT RECORDER
RACK ASSEMBLY (STA 1640)
SEE A VOICE RECORDER
CONTROL PANEL
SEE B
FLIGHT COMPARTMENT
FLIGHT VOICE RECORDER
RECORDER SEE C
(REF) AIRPLANE
CENTERLINE
(REF)
AFT
PASSENGER
CEILING FWD
(REF) VOICE RECORDER CONTROL PANEL
VOICE AND FLIGHT B
RECORDER RACK ASSEMBLY (E7)
A
Voice Recorder System - Component Location
Figure 1 (Sheet 1)
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