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The speech communication system includes : — the VHF capability, — the COM 1 installation, — the COM 2 capability. 2. DESCRIPTION A. VHF capability — refer to 23-11-00 The VHF capability system ensures : — the interphone function between the pilot and the passenger R.N. front station and rear passengers, — the amplification of communication and navigation audio signals applied to the cabin headsets and loudspeaker, — the operation of the radiocommunication means. B. COM 1 installation — refer to 23-12-00 This is the first VHF installation which uses voice—modulated electromagnetic waves to transmit and / or receive air—to—air or air—to—ground messages. C. COM 2 capability As regards the second VHF installation, the aircraft is pre—equipped with a VHF 2 antenna and its coaxial cable. ACAC Validity : COM 2 capability 23-10-00Page 1 (DA) DEC 99 PAGE INTENTIONALLY LEFT BLANK ACAC Validity : COM 2 capability 23-10-00Page 2 (DA) DEC 99 SPEECH COMMUNICATIONS MAINTENANCE PRACTICES 1. SERVICING For information on electronic equipment, refer to the corresponding manufacturer's manual. NOTE : For "RADIO MASTER" switch, refer to chapter 24-50-00. 2. REMOVAL / INSTALLATION - SPEECH COMMUNICATION EQUIPMENT (Figure 201) NOTE : This procedure applies to most of speech communication equipment installed in the radio rack. A. Tools and consumable materials - Allen wrench 3/32 in B. Typical removal procedure of a speech communication equipment 1) Make sure the switch-breaker of the main switch is open. 2) Insert a 3/32-in Allen wrench into orifice (2) located on the front face of the speech communication equipment. NOTE : The location of orifice (2) on the front face varies according to the equipment type. 3) Fully unscrew the locking system. Do not force. 4) Extract speech communication equipment (1) by pulling it from the sides (Do not pull the equipmentfrom the control knobs). C. Typical installation procedure of a speech communication equipment 1) Make sure the switch-breaker of the main switch is open. 2) Check the condition of the pins of the connector secured at the bottom of the rack. 3) Insert speech communication equipment (1) into its rack. 4) Apply a light axial pressure to engage the equipment connector into the rack's connector. 5) Screw the locking system with a 3/32-in Allen wrench. 6) Make sure the speech communication equipment is correctly secured in its rack (correct locking). 7) Make sure all the tools and materials are removed and the work area is clean and free from debris. 8) Perform an operational test of the system. 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(8) |
