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1) Disconnect the battery - refer to 24-30-02. 2) If connected, disconnect the ground power unit - refer to 24-40-00. 3) Install the warning sign prohibiting main switch-breaker operation. WARNING DO NOT OPERATE MAINTENANCE WORK IN PROGRESS 4) Remove the L. H.front seat — refer to 25-11-00. 5) Remove circuit breaker panel attaching bolts. Disengage the panel. CAUTION : MAKE SURE NOT TO PULL ELECTRICAL WIRING DURING REMOVAL OF UPHOLSTERING PANEL. 6) Remove side upholstering panel (1) No. 231 L. 7) Remove insulation panel (8). 8) Unfold, if installed, insulator (7) to get access to attachments. 9) Remove locknuts (2) and insulating washers (3) and hold bolt (5) head. Discard locknuts (2). 10) Release printed circuit (6) from its attachments. CAUTION : BEFORE ANY ACTION, MARK THE CONNECTION OF ALL CABLES CONNECTED TO THE PRINTED CIRCUIT. 11) Disconnect printed circuit cables. 12) Retain insulating washers (4). 13) If installed, retain insulator (7). C. Installation of the radio master relay U15 printed circuit (Figure 201) 1) Make sure the battery is disconnected and that no external power supply is connected to the aircraft. 2) Connect the cables to printed circuit as marked during the removal procedure. 3) Position the insulator (7), if installed, on the printed circuit attachments. AAAA Validity : Option Pre-MOD. 151 Standard Post-MOD. 151 23-12 06 (BA) Pialgoev2(011 4) Install insulating washers (4). 5) Install and secure printed circuit (6) with insulating washers (3) and new locknuts (2). 6) Make sure all the tools and materials are removed and the work area is clean and free from debris. 7) Fold insulator (7), if installed, as shown on the Figure. 8) Install insulation panel (8). 9) Install side upholstering panel (1) No. 231L. 10) Install the circuit breaker panel. 11) Install L.H. front seat - refer to 25-11-00. 12) Connect the battery - refer to 24-30-02. 13) Remove the warning sign prohibiting main switch-breaker operation. 14) Perform an operation test of the radio master relay printed circuit. 3. ADJUSTMENT / TEST — RADIO MASTER RELAY U15 PRINTED CIRCUIT A. Tools and consumable materials None B. Test of the radio master relay U15 printed circuit 1) Park the aircraft on a clear and secure area. 2) Make sure the radio master switch is set to OFF. 3) Close main switch-breaker. 4) Make sure the radio equipment of the PL30 radio rack are de-energized. NOTE : Make sure first that the ON/OFF control of each equipment is set to ON. 5) Set the radio master switch to ON. 6) Make sure the radio equipment of the PL30 radio rack are energized. 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(36) |
