canadair
challenger
OPERATING MANUAL
SECTION 6
COMMUNICATIONS
TABLE OF CONTENTS
Subject
GENERAL
COMPONENTS
Headphone, Loudspeaker, Microphone, and Transmit Control Facilities
Audio Electronics Unit
Audio Control Unit
Ground Crew Interphone Unit
VHF Communication Radio Components
Radio Control Units
POWER SUPPLY
EMERGENCY OPERATION
Pilot's Station
Copilot's Station
Ground Crew Interphone Stations
LIST OF ILLUSTRATIONS
Figure
Number Title
1 Communication System Controls
2 Pilot's or Copilot's Audio Control Unit
3 Ground Crew Interphone Unit
4 VHF 1 Radio Controls
5 VHF 2 Radio Controls
6
canadair
ctiaiienQer
OPERATING MANUAL
SECTION 6
COMMUNICATIONS
1 . GENERAL
The aircraft is equipped with two VHF communication radio systems and an
intercom system. The intercom consists of the pilot's and copilot's stations
with f u l l radio and flight deck interphone f a c i l i t i e s , and ground crew
interphone stations in the nose wheel well, in the radio rack, and at the APU
station. The interphone circuits provide two-way communication between all
five stations when the aircraft is on the ground.
The audio signal from the aircraft aural warning system is fed to both pilots1
headphone channels and direct to both pilots1 loudspeakers.
2. COMPONENTS
For the arrangement of communication system controls, refer to Figure 1. The
components of the systems are as follows:
A. Headphone, Loudspeaker, Microphone, and Transmit Control Facilities
Each of the five stations is equipped with separate headphone and
microphone jacks, and the pilot's and copilot's stations each have an
additional jack for an oxygen mask microphone. The pilot's and copilot's
main microphone jacks include circuits for headset boom microphone talk
switches. Each pilot's station is also provided with a press-to-transmit
switch on the aileron control wheel, and an overhead mounted loudspeaker.
B. Audio Electronics Unit
All the audio signals from radio communication, radio navigation, and
interphone systems, and the transmit control circuits, are processed by the
audio electronics unit in the underfloor radio rack. The unit is
functionally divided into pilot's and copilot's channels, each channel
having i t s operating controls on the corresponding audio control unit.
C. Audio Control Unit (Figure 2)
The p i l o t 's and copilot's audio control units are located on the side
consoles and contain the main system controls. Each unit has nine monitor
switches for routing system outputs into the headphone-speaker channel.
Also included are a volume control for the headphones and speaker, a switch
for selection of either headphones or speaker or both, a switch for
selection of headset boom or oxygen mask microphone, and a rotary switch
for selection of two-way communication on either of the two communication
radio systems or on interphone. Operation of the pilot or copilot PTT
switch allows transmission over the selected radio channel.
SECTION 6
Page 1
May 28/82
canadair
chanentjer
OPERATING MANUAL
PILOT'S AUDIO
CONTROL UNIT
COPILOT'S AUDIO
CONTROL UNIT
PILOT'S OXYGEN MASK STOWAGE
(Mask microphone jack inside)
COMM-1 \
CONTROL UNIT COPILOT'S OXYGEN MASK STOWAGE
(Mask microphone jack inside)
NOTE
Ground crew interphone units
not shown (refer to Figure 3).
HEADPHONE AND
MICROPHONE JACKS
©
Communication System Controls SECTION 6
Figure 1 Page 2
May 28/82
canadair
chanencjer
OPERATING MANUAL
MONITOR SWITCHES ^
Used to select (up position) audible output of
communication and navigation radios separately or in
combination. Each radio must first be switched on
independently.
*
SPKR VOL CONTROL &
Varies volume of audio to speaker and
headphones except aural warning. Turn
clockwise to increase volume.
SPKR-PHONE-BOTH SWITCH ^
Switches audio to speaker, headphones, or
both, but pilot's speech on interphone is not
transferred to speaker.
NAV DME MKR ADF VHF
g S 0 0 0 0 0 8 9
SPKR BOOIV
@ BOTH Q
BOOM - O XY SWITCH
Connects headset boom microphone or
oxygen mask microphone to system.
NOTES
1 The pilot's facilities are described; the copilot's are similar except
as noted.
/£\Emerqencv Operation: if power fails in either channel of the audio
electronics unit, controls marked /2\do not function. Pilot can
use VHF 1 and hear NAV 1 without volume control. Copilot can
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