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headphones and flight compartment speakers. Crew alerting audio cannot be muted or volume
controlled.
COMMUNICATIONS
Description
Vol. 2 06−10−2
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUDIO INTEGRATING SYSTEM (CONT'D)
Audio Integrating System Components
Figure 06−10−2
COMMUNICATIONS
Description
Vol. 2 06−10−3
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUDIO INTEGRATING SYSTEM (CONT'D)
Audio Control Panel
The audio control panels are used to select and control received audio from the communication
and navigation systems, as well as to connect microphone keying and audio to the HF/VHF
communication radios, the PA system, and the crew and service interphone.
The audio control panel includes the following controls, switches and selectors:
• Audio On/Off and volume controls;
• Microphone selector;
• Radio Transmit/Off/Intercom switch (R/T I/C);
• Voice/Both switch;
• Speaker On/Off/Volume switch;
• Mask/Boom switch; and
• Emergency/Normal switch.
Audio On/Off and Volume Controls
Individual controls are provided for each system where audio is available. Audio is heard when
the associated control is pressed, while rotating it adjusts the volume. Each control is provided
with backlighting when selected.
Microphone Selector
The position of the microphone selector switch determines which system receives push-to-talk
(PTT) commands and crew audio. Audio and sidetone for the selected system is automatically
enabled without the requirement for a separate selection of the audio on/off control.
Radio Transmit/Off/Intercom Switch
The R/T I/C switch is a three-position, center-off switch providing PTT functionality for the
intercom, boom or oxygen mask microphones. When selected OFF, PTT function is provided
by the control wheel PTT switch or the hand microphone. The momentary position R/T
selection is used as a PTT switch for the boom or oxygen mask microphone. It returns to the
center OFF position when released. The I/C position is latched, when selected, to enable a hot
microphone intercom between the flight crew.
Voice/Both Switch
The VOICE/BOTH switch allows the crew to separate audio when monitoring the navigation
radios. When BOTH is selected, the station Morse identification tone and voice message may
be heard. When VOICE is selected, all station Morse identification tones are filtered out, to
allow a clear voice signal to be heard.
Speaker Switch
The SPKR switch provides on/off and volume control of the overhead speaker. The audio
control unit automatically mutes the speakers when any microphone push-to-talk switch is
activated.
Mask/Boom Switch
The MASK/BOOM switch is used to enable keying operation of the oxygen or boom
microphone.
COMMUNICATIONS
Description
Vol. 2 06−10−4
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUDIO INTEGRATING SYSTEM (CONT'D)
Emergency/Normal Switch
The latching EMER/NORM switch is normally selected to the NORM position. Moving the
switch to the EMER position results in audio bypassing the audio control panel. As a result, the
crew microphone, headset and speaker is connected directly to the onside radio system.
Audio Control Panel
Figure 06−10−3
COMMUNICATION RADIOS
Description
The aircraft’s basic communication radio installation includes two VHF and two HF communication
transceivers. There are no master control switches for the radios. They are automatically powered
when electrical power is applied to the aircraft. Radio selection and tuning can be carried out using
the flight management system (FMS) control display unit (CDU), or the cursor control panel (CCP)
and the multifunction display (MFD).
VHF Communications
The basic VHF communication system includes two transceivers, installed in the avionics
compartment. The VHF antennas are installed on the upper and lower fuselage. The system
provides short range voice communications in the frequency range of 118.000 to 136.975 MHz,
with 25 kHz or 8.33 kHz tuning functionality.
A third VHF transceiver may be installed for additional voice communication capabilities. A third
VHF is also required if the optional VHF digital datalink function is installed (VDL – ModeA/2).
The datalink supports the integrated flight information system (IFIS), which provides enhanced
maps, graphical weather and electronic charts on the MFD.
COMMUNICATIONS
Description
Vol. 2 06−10−5
　
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