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4) If all these results are obtained, the indicator and fuselage system are operating properly. 5) If not, disconnect the indicator and test the wire (EJ4 or EJ5). If the wire is correct then the indicator is faulty. 2. CHECK OF FUEL GAGES AND FUEL ELECTRICAL SYSTEM IN WINGS (Figure 601) A. Tools and consumable materials - Ohmmeter B. Procedure WARNING : APPLY THE MAINTENANCE PROCEDURE OF THE FUEL TANKS — REFER TO 28-00-00. NOTE : Any defective fuel gage must be sent to a specialized repair shop for overhaul or must be replaced. S / N 275 - 524 1) Drain the appropriate tank - refer to 12-11-02. AEAB Validity : S / N 275 - 968, 970 - 1184, 1186 - 1213, 1215 - 1477, 1479 - 1505, 1509 - 1512 28-40-01 Page 601 (EA) SEP 02 2) Perform the preceding checks on the level indicator and fuel electrical system in the fuselage. If they are operating properly, proceed as follows. 3) Connect an ohmmeter to electric connector (1) on the wing side and test the wire (EJ4E for the R.H. wing, EJ5E for the L.H. wing) as specified below : a) If ohmmeter reads infinite : wire is broken at point "a". b) If ohmmeter reads approximately 305 ohms : wire is broken at point "b". c) If ohmmeter reads approximately 485 ohms : wire is broken at point "c". d) If ohmmeter reads approximately 190 ohms : the electrical system is operating properly, therefore check the fuel gages. 4) Disconnect wire from wing root fuel gage. 5) Via the filler port, control the displacement of the tip fuel level gage and take ohmmeter readings at electric connector (1) ; when the fuel gage is at its uppermost limit of displacement, the ohmmeter should read approximately 0 ohm, and when the gage is at its lowest limit, the ohmmeter should read approximately 305 ohms. 6) If these results are obtained, the tip fuel gage is operating correctly, therefore, it means that the wing root fuel gage is defective. 7) If one of these values is not reached, the tip level gage is defective. 3. CHECK OF FUEL TANK LEVEL INDICATORS AND FUEL ELECTRICAL SYSTEM IN FUSELAGE AND WINGS (cylindrical float gages) (Figure 602) A. Tools and consumable materials - Ohmmeter B. Procedure NOTE : No operation on the engine monitoring cluster is allowed. In case of failure, the engine monitoring cluster shall be replaced. S / N 525 - 968, 970 - 1184. 1186 - 1213, 1215 - 1477. 1479 - 1505, 1509 - 1512 1) Remove engine monitoring cluster (2) - refer to 31-10-03. 2) Using an ohmmeter, measure on electric connector (1) the resistance between the positive terminals (No. 1, 2, 6 and 7) and the ground terminals (No. 11 and 12). 3) Compare the measurements with the Table Figure 602 for each configuration of the tanks (full, 3/4, 1/2, 1/4 and empty). 4) If the value of each tank configuration (from full to empty) remains at the maximum value with an empty tank, the float of this fuel level gage must be defective (disconnected or pierced and full of fuel etc.). 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 28 FUEL TB20飞机维护手册 燃油(48) |
