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OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-23-00
Page 39
May 30/02
Revision 7
The intercommunications system is protected by the following CBs:
Circuit Breaker Name: CB Panel: Location: Power Source:
CKPT AUDIO #1 CP H-8 FWD EMER BATT
CKPT AUDIO #2 CP I-8 L MAIN DC Bus
4. Limitations:
A. Flight Manual Limitations:
There are no limitations for the intercommunications system at the time of
this revision.
OPERATING MANUAL
2A-23-00 PRODUCTION AIRCRAFT SYSTEMS
Page 40
May 30/02
Revision 7
Baker Audio Control Panel
Figure 8
OPERATING MANUAL
2A-23-00
Page 41 / 42
May 30/02
2A-23-60: Cockpit Voice Recorder System
1. General Description:
The Cockpit Voice Recorder (CVR) system provides a means for recording the
most recent thirty (30) minutes of all audio signals transmitted and received by
aircraft crew members. This allows the recorded data to be retrieved for
investigatory purposes. The CVR system is composed of the following units and
components:
• CVR Unit
• CVR Control Unit
• Cockpit Area Microphone
• Impact Switch
2. Description of Subsystems, Units and Components:
A. CVR Unit:
The CVR is mounted in the right side of the tail compartment. It provides
four (4) separate channels of voice recording of either transmitted or
received signals that originate at the pilot’s or copilot’s stations and in the
cockpit area. The fourth channel is a spare. Signals are recorded on an
endless-loop magnetic tape for a maximum period of 30 minutes. The
recorder medium is contained within a highly-protective enclosure to guard
against potential damage resulting from an aircraft accident.
An underwater acoustic beacon is physically attached to CVR unit to aid in
location of CVR unit if lost in a body of water. The acoustic beacon is
automatically triggered upon contact with water and operates from internal
battery power.
B. Voice Recorder Control Unit (VRCU):
The VRCU is located on the copilot’s side console. It accepts voice inputs
for the pilot, copilot and cockpit area microphone and then outputs the
audio signals to the CVR unit. Pilot and copilot receiver and transmitter
audios are routed to the CVR through selection on the Audio Control Panel
(ACP) amplifiers, while cockpit area microphone audio signals are
introduced into an internal preamplifier and then output to the CVR.
The VRCU provides the capability to perform internal testing of the CVR
system using the TEST switch. The cockpit area microphone can also be
tested by connecting a headset in the HEADSET jack.
Bulk erasing of the CVR tape can be accomplished using the VRCU’s
ERASE switch or using a BULK ERASE switch located on the right-hand
radio rack test panel. Erasing capability, however, is interlocked with the
nutcracker system and is only possible on the ground.
The CVR contains an hourmeter that indicates total hours that CVR has
been used. The hourmeter has a scale 0 to 5000 hours.
C. Cockpit Area Microphone:
The cockpit area microphone is located on the windshield center post
between the angle-of-attack indexer lights. It is positioned to maximize the
recording of human conversation and other ambient sound in the cockpit
area while at the same time suppressing engine noise.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-23-00
Page 43
May 30/02
Revision 7
D. Impact Switch:
The CVR impact switch is located adjacent to the CVR in the tail
compartment. Activation of the switch is automatic upon an impact severe
enough to overcome its set force limit. Activation of the switch signals the
CVR to cease recording, saving the previously-recorded data, also
triggering an annunciation lamp which illuminates continuously. A reset
button is located on the impact switch to reset the system.
3. Controls and Indications:
(See Figure 9 through Figure 11.)
A. Circuit Breakers (CBs):
The cockpit voice recorder system is protected by the following CBs:
Circuit Breaker Name: CB Panel: Location: Power Source:
CKPT VOICE RECORDER CP D-13 ESS AC Bus, φA (1)
NOTE(S):
(1) Applies to Aircraft 1096 and subsequent. For Aircraft 1000 and Aircraft
1002 through 1095 (excluding 1034), not having ASC 49 / 49A but having
ASC 186, power source is the ESS DC bus.
B. Advisory (Blue) CAS Messages:
CAS messages provided by the cockpit voice recorder system are:
CAS Message: Cause or Meaning:
VOICE REC FAIL Cockpit Voice Recorder has failed.
4. Limitations:
There are no limitations established for the cockpit voice recorder system at the
　
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