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(EA) SEP 02 1 - Fuel inlet (from engine pump) 2 - Mixture control lever 3 - Butterfly valve 4 - Flow divider supply 5 - Air inlet before venturi 6 - Air inlet 7 - Venturi 8 - Ball valve 9 - Fuel diaphragm 10 - Air diaphragm 11 - Return spring 12 - Mixture / throttle control connecting lever 13 - Metering jet 14 - Strainer Regulation - Description and operation Key to Figure 2 Regulation - Description and operation Figure 2 ADAA Validity : S / N 1 - 9999 Page 5 73-20-00 (EA) SEP 02 PAGE INTENTIONALLY LEFT BLANK INJECTION PUMP SERVICING WARNING : OBEY THE SAFETY PRECAUTIONS DESCRIBED IN 28-00-00. 1. CLEANING OF INJECTION PUMP STRAINER (Figure 301) A. Tools and consumable materials - Torque wrench 0 - 177 lbf.in (0 - 20 N.m) - Filtered, compressed air supply - Cleaning agent (TB 11-003) - Red paint - Drain pan 0.5 US Gal (2 liters) - Blanking plugs 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 : APPLY THE MAINTENANCE PROCEDURE OF THE FUEL SYSTEM — REFER TO 28-00-00. 1) Open main switch-breaker. 2) Set the fuel selector to "CLOSED" position. 3) Drain the fuel system in the fuselage - refer to 12-11-02. 4) Remove the engine cowlings - refer to 71-10-01. 5) Install a drain pan under injection pump (1). 6) Disconnect pipe (6) from union (5). Blank off. 7) Remove union (5) and discard seal (4). 8) Remove strainer (3) and its spring (2). Blank off. 9) Clean strainer (3) with cleaning agent (TB 11-003) and dry it with filtered, compressed air. 10) Make sure strainer (3) is not distorted or pierced. Replace it if necessary. 11) Remove the blanking plug, install spring (2) and strainer (3). 12) Install union (5) fitted with a new seal (4). Torque - refer to 20-00-01. 13) Remove the blanking plug, connect pipe (6) - refer to 20-00-02. 14) Set fuel selector to "LEFT" or "RIGHT" position. 15) Bleed the fuel system - refer to 12-11-02. CAUTION : MAKE SURE THAT THE SELECTED TANK CONTAINS FUEL BEFORE ACTUATING THE ELECTRIC PUMP. 16) Perform a leakage test with the fuel system pressurized - refer to 28-00-00. 17) Check for leaks. 18) Mark union (5) and nut of pipe (6) with a red paint line. 19) Remove the drain pan. 20) Make sure all the tools and materials are removed and the work area is clean and free from debris. 21) Install the engine cowlings - refer to 71-10-01. 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(9) |
