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COM/NAV systems, and controls for connecting the microphone audio and keying to the HF/VHF
systems.
Audio Control Panels
Two 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 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.
NOTE
Hot-mic communications can be selected by any one of the following
switches:
• RT/IC switch on either audio control panel
• INT/SVC transmit select switch on either audio control panel with PTT
pushed
• IC/OFF/RT switch on either audio control panel
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.
When the pilot’s audio control panel EMER/NORM switch is set to EMER, the pilot’s headset is
connected directly to NAV 1 navigation radio and VHF 1 communication radio. Most of the
system is bypassed, making most audio control panel functions inoperative. The pilot’s speaker
is disabled, and all warnings and tones are heard through his headset. When using the oxygen
mask with the switch set to EMER, the pilot’s boom mike should be unplugged from the jack
panel. The boom mike jack is located forward of the headphone jack.
When the copilot’s audio control panel EMER/NORM switch is set to EMER, the copilot’s
headset is connected directly to NAV 2 navigation radio and VHF 2 communication radio. Most
of the system is bypassed, making most audio control panel functions inoperative. The copilot’s
speaker is disabled, and all warnings and tones are heard through his headset. When using the
oxygen mask with the switch set to EMER, the copilot’s boom mike should be unplugged from
the jack panel. The boom mike jack is located forward of the headphone jack.
COMMUNICATIONS
Description
Vol. 2 06−10−2
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
AUDIO INTEGRATING SYSTEM (CONT'D)
The passenger address and interphones do not have emergency mode operation.
Audio Integrating System Components
Figure 06−10−1
COMMUNICATIONS
Description
Vol. 2 06−10−3
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
AUDIO INTEGRATING SYSTEM (CONT'D)
Audio Control Panel
Figure 06−10−2
VHF COMMUNICATION SYSTEM
Description
The VHF communication system consists of two very high frequency (VHF) transceivers (VHF 1
AND VHF 2) which operate independently. The VHF transceivers provide amplitude modulated
(AM) short-range voice communications in the frequency range of 118.00 to 151.975 MHz,
selectable in increments of 25 KHz/8.33 KHz.
COMMUNICATIONS
Description
Vol. 2 06−10−4
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
VHF COMMUNICATION SYSTEM (CONT'D)
Components and Operation
The VHF communication system consists of the following components:
• Two transceivers
• Two antennas
Associated components:
• Two radio tuning units (RTUs)
• Two audio control panels
• One reversionary/inhibit panel
• Integrated avionics processing system (IAPS)
Transceivers
Two VHF–422B transceivers contain the circuits required for transmission and reception of radio
signals, and processing of audio signals.
Antennas
There are two VHF antennas located as follows:
　
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