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- the selection, for transmission, of one of the radiocommunication systems which equip the aircraft, - the intercom function for the pilot and the passengers, - the listening to certain audio warning signals without the possibility to interrupt these audio signals. The equipment front panel features : - the "Volume" knob (1) for energization and volume adjustment of the intercom, - two rows of latched pushbuttons (2) to select the audio systems installed on the aircraft, - a function selector (3) ensuring the selection for transmission of the VHF or HF radiocommunication systems, if installed. - an intercom mode selector (8) (Iso - All - Crew), - a photo detector (7) ensuring the lighting of the front panel according to brightness, - an "ICS" crew intercom selector (6), - a loudspeaker selector switch (5), - a transmission indicator (4). The push-to-talk switches, the connection jacks, the connection plugs (option) and the cabin loudspeaker are associated to A50 audio control panel. Electrical power supply is provided by "BUS 1" bar. The power supply line is protected by CB 84 "AUDIO" circuit breaker. The A50 audio control panel is mounted in the upper portion of PL30 radio rack. AHAH Validity : PMA 7000MS 23 11-00Page 2 (DE) JUN 04 A - A50 audio control panel AHAH
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