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PAGE INTENTIONALLY LEFT BLANK ACAA Validity : S / N 1 - 9999 74-20-00age 4 74 IGNITION HARNESS REMOVAL / INSTALLATION 1. REMOVAL OF IGNITION HARNESSES (Figure 401) A. Tools and consumable materials - Vinyl tube, inner diameter 0.31 in (8 mm) B. Procedure WARNING : PRIOR TO ANY OPERATION, ENSURE THAT THE ENGINE, EXHAUST PIPE AND MANIFOLDS ARE COLD. IF NOT, TAKE NECESSARY PRECAUTIONS TO AVOID SEVERE BURNS. WARNING : PRIOR TO ANY OPERATION, ENSURE THAT THE KEY IS REMOVED FROM MAGNETO SELECTOR AND THAT "MAIN SWITCH" IS OFF. IF AIRCRAFT IS EQUIPPED WITH DISCONNECT PLUG ON FIREWALL, DISCONNECT "MAGNETO DISCONNECT" PLUG AND CONNECT IT TO "GROUND MAGNETO FOR SERVICING" PLUG. 1) Remove the engine cowlings - refer to 71-10-01. 2) Mark the ignition harness routing. 3) Cut and discard the high temperature tie-wraps. 4) Remove the attaching clamps located on the engine and the engine bulkheads, clear the clamps from the ignition harnesses and temporarily install them in position. NOTE : Check attaching clamps for correct condition, replace defective clamps. 5) Remove the engine bulkhead grommets. 6) Disconnect harness ends (2). 7) Protect the insulating part of harness ends (2) with a vinyl tube. CAUTION : DO NOT PEEL THE HARNESS PROTECTIVE SLEEVE WHEN PASSING THE IGNITION HARNESS THROUGH THE ENGINE BULKHEADS. 8) Clear the ignition harnesses. 9) Remove dual magneto cover (3) : a) Mark and disconnect magneto ends (5) and ground wires (4). b) Remove screws (6) and lockwashers (7). Discard lockwashers (7). c) Carefully clear cover (3) rearwards. d) Mark and disconnect the condensers. 10) Remove cover (3) and the ignition harnesses. 2. INSTALLATION OF IGNITION HARNESSES (Figure 401) A. Tools and consumable materials - High temperature tie-wraps - Cleaning agent (TB 11-003) ACAA Validity : S / N 1 - 9999 20-01 Page 401 - Clean, lintfree cloth - Varnish (TB 07-901) B. Procedure WARNING : PRIOR TO ANY OPERATION, ENSURE THAT THE ENGINE, EXHAUST PIPE AND MANIFOLDS ARE COLD. IF NOT, TAKE NECESSARY PRECAUTIONS TO AVOID SEVERE BURNS. WARNING : PRIOR TO ANY OPERATION, ENSURE THAT THE KEY IS REMOVED FROM MAGNETO SELECTOR AND THAT "MAIN SWITCH" IS OFF. IF AIRCRAFT IS EQUIPPED WITH DISCONNECT PLUG ON FIREWALL, DISCONNECT "MAGNETO DISCONNECT" PLUG AND CONNECT IT TO "GROUND MAGNETO FOR SERVICING" PLUG. 1) Make sure ends (8) lie flat against the cover, position them correctly if necessary. CAUTION : DO NOT TOUCH THE INSULATING PART OF THE HARNESS ENDS ONCE CLEANING HAS BEEN PERFORMED. 2) Clean harness ends (2) with a clean, lintfree cloth moistened with cleaning agent (TB 11-003). 3) Install dual magneto cover (3) : 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 74 点火 TB20飞机维护手册(7) |
