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Vol. 1 05--10--1
COMMUNICATIONS
Introduction REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
1. INTRODUCTION
The communications system consists of the following:
S Audio Integrating System
S Announcement and Boarding Music System <1035>
S Radio Communication System
Two radio tuning units are used to frequency tune the radios. A back-up standby tuning unit
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 various 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.
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. <1035>
Vol. 1 05--10--2
COMMUNICATIONS
Introduction Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
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Vol. 1 05--20--1
COMMUNICATIONS
Audio Integrating System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
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
pushbutton. Audio sources selected on the audio control panel can be routed to the
flight compartment speakers by pressing in the speaker switch. Speaker volume is
controlled by rotating the speaker control.
A radio transmit (R/T) and intercom (I/C) switch is used to transmit on the radios or
passenger address system. The R/T position, when pressed, allows the pilot to
transmit. When released, it returns to the OFF position, to receive. Continuous (“hot
mike”) conversation is provided in the I/C position for the intercom systems. A radio
transmit (R/T) and intercom (I/C) switch is also provided on each pilot control wheel.
Selecting VOICE on the VOICE/BOTH switch eliminates the station Morse code
identifier from VOR, ILS and ADF received signals. The MASK/BOOM switch gives the
flight crew a choice between headset with boom mike (or hand mike) with BOOM
selected, or the oxygen mask microphone, when MASK is selected.
During normal operation, the latching EMER/NORM switch is in the NORM position.
The EMER position is used only when the audio integrating system fails. The
EMER/NORM switch is disabled at the observer’s station.
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