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c) Make sure all the tools and materials are removed and the work area is clean and free from debris. d) Install the engine cowlings - refer to 71-10-01. e) Perform a test run-up - refer to 05-30-02. Check idle value. 5) Repeat the idle adjustment procedure until idle value is correct. 2. MIXTURE ADJUSTMENT AT IDLE (Figure 501) A. Tools and consumable materials None B. Procedure 1) Perform a test run-up - refer to 05-30-02. 2) With mixture control on full rich position (control against forward stop), set the throttle control to idle position. CAUTION : DO NOT SET MIXTURE CONTROL TO CHOKE STOP. 3) Set mixture control to lean position (control backward) very slowly. Engine rating must increase by 20 to 40 RPM and manifold pressure must decrease by 1/4 in.Hg before engine rating drops. ADM Validity : S / N 1 - 9999 73 20-01Page 501 (EA) SEP 02 4) Before the engine stops, set mixture control to full rich position. The engine must return to its idle rating. 5) Stop the engine - refer to 05-30-02. 6) If mixture has to be adjusted, perform the following operations : a) Remove the engine cowlings - refer to 71-10-01. 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. b) Turn mixture adjustment nut (4). Turn mixture adjustment nut (4) in the direction shown by the arrow of mark "R" (marked on the throttle / mixture connecting lever) to increase RPM. Turn mixture adjustment nut (4) in the opposite direction to reduce RPM. c) Make sure spring (10) is in a notch of mixture adjustment nut (4). d) Make sure all the tools and materials are removed and the work area is clean and free from debris. e) Install the engine cowlings - refer to 71-10-01. f) Perform a test run-up - refer to 05-30-02. Check mixture value. 7) Repeat the mixture adjustment procedure until mixture value is correct. 8) After adjusting mixture, adjust idle - refer to Paragraph 1. ADAA Validity : S / N 1 - 9999 Page 502 73-20-01 (EA) SEP 02 1 - Idle adjustment screw 2 - Strainer and fuel inlet 3 - Mixture hinge bolt 4 - Mixture adjustment nut 5 - Throttle control lever, full throttle position 6 - Hinge bolt of throttle butterfly valve 7 - Throttle control lever, idle position 8 - Fixed stop 9 - Full throttle movable stop 10 - Spring 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 73 发动机燃油和控制 TB20飞机维护手册(12) |
