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is provided in the event of a failure of one of the radio tuning units. The audio integrating
system receives inputs from the radios and the intercom/interphone systems. The system
then provides audio output to the flight crew speakers, headsets, passenger address
system, communication radios and recorders. All incoming, outgoing and internal
communications are recorded on the cockpit voice recorder.
The flight crew intercom system permits communications between stations within the aircraft,
selection and monitoring of audio on the communications and navigation receivers, and
selection for transmission on the communications transceivers. The flight crew can select
and monitor the audio output of one or more communications transceivers and navigation
receivers.
Individual speakers, installed above the pilot and copilot, are used to monitor audio selected
at the audio control panels. Hand microphone jacks are installed at the rear of each control
column. Headset jacks are installed below the pilot’s and copilot’s side consoles and the
right side of the observer’s station.
The service interphone system provides intercommunication between service and
maintenance areas and the flight compartment. The service interphone and passenger
address systems are interconnected. The flight attendants use their telephone-type
handsets for both systems. One handset is located on each attendant’s panel. Switches
located on the interphone control panel in the flight compartment centre pedestal, access
the external maintenance interphone stations and flight attendant’s handsets.
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Introduction
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The passenger address system enables the pilots and flight attendants to address
passengers through speakers located throughout the cabin and in the lavatory.
The announcement and boarding music system provides voice messages and music
through the passenger address system. <0009><0035><0036><0085>
Data communications provides a message link between the airplane computers and ground
service providers.<0082>
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Introduction
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Communications --- Block Diagram
Figure 5---10---1
FLIGHT
COMPARTMENT
AUDIO
NAVIGATION
RADIO
NAV SIGNALS
RECEIVERS
FLIGHT
CREW
INTERCOM
SYSTEM
FLIGHT
COMPARTMENT
SPEAKERS
(AUDIO
INTEGRATING
SYSTEM
ELECTRONIC
CONTROL
UNIT)
(3 CHANNEL)
EICAS
DATA
CONCENTRATOR
UNITS
GROUND
PROXIMITY
WARNING
SYSTEM
FLIGHT
DATA
RECORDER
NAVIGATION
AND
WARNINGS.
EICAS WARNING
SIGNAL, DIGITAL
VOICE
GPWS
TONES,
DIGITAL
VOICE
RADIO PTT
COCKPIT
VOICE
RECORDER
PASSENGER
ADDRESS
SYSTEM
TAPE
PLAYER
FLIGHT
COMPARTMENT
AREA
MICROPHONE
PROXIMITY
SENSOR
ELECTRONICS
UNIT
ERASE
ENABLE
FLIGHT
COMPARTMENT
MICROPHONES,
PTT
COMM
TRANSCEIVERS
INTERPHONES
AUDIO
CONTROL
PANELS
VOICE
VOICE/DATA
VOICE
VOICE
DATA
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COMMUNICATIONS
Audio Integrating System
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MASTER
1. AUDIO INTEGRATING SYSTEM
The audio integrating system provides display, switching and control of all incoming and
outgoing audio signals from the aircraft navigation and communication systems. The audio
integrating system receives inputs from various radio sources and from internally generated
audio systems. The system provides audio output to the flight crew speakers, headsets,
passenger address system, communication radios and to the cockpit voice recorder.
A. Audio Control Panels
Three audio control panels, located in the centre pedestal, provide the primary interface
between flight crew and audio system. Each audio control panel provides a rotary
transmit switch for selection of communication transceivers, interphone/service and
passenger address systems.
Audio from the selected system is enabled by pressing the corresponding pushbutton
and adjusting the desired volume. A switch and a potentiometer are combined in each
　
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