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B. Cabin loudspeaker The cabin loudspeaker ensures audio distribution inside the cabin. It is mounted on the overhead panel. C. Connection jacks, connection plugs The E001-E004 and E013-E016 connection jacks are mounted on the support plate of tunnel No. 236. They enable headsets or hand microphones to be connected to the aircraft system. With BOSE headset J81 and J82 [J21 and J22] connection plugs are mounted on the same plate as E001-E004 [E013-E016] jacks. They enable headsets to be connected with active noise attenuation. Headsets are electrically supplied via connection plugs, by "BUS 1" bar and protected by CB 81 "HEADSETS" circuit breaker. D. S43 "CREW MUSIC" selector S43 selector enables to interrupt music at pilot and R.H. front stations. 4. OPERATION The "RADIO MASTER" switch controls the energization of all radionavigation and radiocommunication systems. Electrical power supply to radiocommunication and radionavigation systems is automatically interrupted during engine starting. On A50 audio control panel, the "PILOT" inner knob enables energization of the equipment. The "PILOT" concentric knob for pilot station and the "COPILOT" concentric knob for R.H. front and rear stations enable to set the volume and squelch of the intercom function. "ICS ISOLATION" (6) pushbuttons enable to select one of the 3 intercom function modes : - "PILOT" pushbutton actuated (LED on) : the pilot is no longer connected with R.H. front and rear stations with intercom function. He is the only one to be connected to radiocommunication and radionavigation audio systems. - "CREW" pushbutton actuated (LED on) : the pilot and R.H. front stations are connected to radiocommunication and radionavigation audio systems, and are connected together with intercom function. At rear stations, passengers can communicate with each other but not with front stations. - "PILOT" and "CREW" pushbuttons not actuated (LED off) : pilot, R.H. front and rear stations are connected to radiocommunication and radionavigation audio systems, and are connected together with intercom function. To select a radiocommunication or radionavigation audio system, press the pushbutton corresponding to the necessary audio system (LED on). "COM/MIC" pushbuttons select, for transmission, one of the radiocommunication systems which equip the aircraft. If "COM 1/2" pushbutton is actuated, the pilot station is connected with COM1 aircraft system and the R.H front station is connected with COM2. AIAI Validity : GMA 340 23-11 00Page 6 (Do JUN 04 It is possible to connect a music source to the E60 "MUSIC IN" jack. Passengers have music permanently connected to E60 jack. If S43 selector is set to "ON", it is possible to listen to music from pilot and R.H. front stations, but not at pilot station if "ICS ISOLATION/PILOT" switch is on. It the selector is set to "OFF", pilot and R.N. front stations are isolated from music. 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 23 COMMUNICATIONS TB20飞机维护手册 通讯(22) |
