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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 06.10.5
Oct 05/06
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 06.10.6
Oct 05/06
HF Communications
The HF communication system includes two high-frequency transceivers and two antenna couplers, installed in the aft equipment compartment. The HF system provides long-range voice communications in the frequency range of 2 to 30 MHz.
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