**ON A/C 301-399,
A. Test
(1) Do the BITE test of the FLSS (Ref. AMM TASK 28-46-00-740-001).
(2) Examine the FLSS STATUS page on the MCDU.
(3) If the page shows messages for one or more of the other sensors and/or the FLSCU-1(2), do (Ref. TASK 28-46-00-810-818).
(4) If the message 284615 L(R) UNFULL SENSOR 25QJ1(2):
- is shown, do Para. 4.A.
- is not shown, no work steps are necessary.
NOTE : You can get more data from the:
____
- Aircraft Maintenance Manual (AMM) Chap. 28-46-00, the Fuel Level Sensing System, Description and Operation (D and O)
- Trouble Shooting Manual (TSM) - Task Supporting Data (Ref.
P. Block 301)
- Aircraft Schematic Manual (ASM) (Ref. ASM 28-46/03). You can get more Trouble-shooting data from the CFDS(FUEL):
- Input Parameters Page 3 (Ref. P. Block 301), used with the Fuel Level Sensors Operating (Changeover) Values (Ref. P. Block 301)
- Trouble-shooting Data (Ref. P. Block 301).
NOTE : OPTIONAL TESTING:
____ Where a PSDA321-1 Test Set is available, a check can be made before a decision is made to go into or close up a fuel tank. The Test Set enables a GO/NOGO check to be made of the tank mounted components and wiring from the tank wall connectors.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page 271
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CES
**ON A/C ALL
4. Fault Isolation
_______________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
A. Procedure
(1) Do the steps applicable to the test equipment available.
(2) Test Equipment. WARNING : WHEN YOU DO WORK ON THE FUEL SYSTEM WIRING, YOU MUST USE
_______ TEST EQUIPMENT THAT IS APPROVED (REFER TO INTERNATIONAL OR NATIONAL SPECIFICATIONS FOR INTRINSICALLY SAFE TEST EQUIPMENT, E.G. EN50-020, UL913 OR EQUIVALENT). TEST EQUIPMENT THAT IS NOT APPROVED CAN CAUSE FIRE OR AN EXPLOSION.
(a) If there is:
- approved test equipment available, go to Step (3)
- no approved test equipment available, go to Step (6).
(3) Get access to the tank wall connector 4040VC1(2)-A (for the wing tank harness 14QT1(2)) (Ref. AMM TASK 28-42-43-000-008).
(4) Disconnect the free connector 4040VC1(2)-A from the receptacle 4040VC1(2).
(5) Do a resistance check of the sensor 25QJ1(2) at the tank wall connector 4040VC1(2) between pins <V and EE (Ref. AWM 28-46-07) ( (Ref. AWM 28-46-08)). Make sure the resistance is between 330 and 480 ohms. If there is:
- continuity as specified above, go to Step (6)
- no continuity as specified above (resistance check out of range), go to Step (8).
NOTE : The sensor status (wet or dry) and fuel/air temperature will
____ have an effect on the resistance value.
(6) Replace the FLSCU-1 (7QJ) (FLSCU-2 (9QJ)) (Ref. AMM TASK 28-46-34-000-001) and (Ref. AMM TASK 28-46-34-400-001).
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(7) If the fault continues:
(a) Get access to the tank wall connector 4040VC1(2)-A (for the wing tank harness 14QT1(2)) (Ref. AMM TASK 28-42-43-000-008).
(b) Disconnect the free connector 4040VC1(2)-A from the receptacle 4040VC1(2).
(c) Do a check (Ref. AWM 28-46-07), and (Ref. AWM 28-46-08) of the aircraft wiring (sensor input line - H) between the FLSCU-1(2) rack connector AB, pin 11D and the tank wall free connector 4040VC1(2)-A, pin <V.
(d) Do a check (Ref. AWM 28-46-07), and (Ref. AWM 28-46-08) of the aircraft wiring (sensor input line - L) between the FLSCU-1(2) rack connector AB, pin 11C and the tank wall free connector 4040VC1(2)-A, pin EE.
(e) Do a check (Ref. AWM 28-46-11) of the aircraft wiring (FLSCU-1 BITE 4 test command line) between the FLSCU-1 rack connector AA, pin 15D and the FQIC rack connector AB, pin 7K or ((Ref. AWM 28-46-12) of the aircraft wiring (FLSCU-2 BITE 4 test command line) between the FLSCU-2 rack connector AA, pin 15D and the FQIC rack connector AB, pin 9H).
(f) Do a check (Ref. AWM 28-46-10) of the aircraft wiring (FLSCU-1 LS14 output line) between the FLSCU-1 rack connector AB, pin 2D and the FQIC rack connector AB, pin 4K or the (aircraft wiring (FLSCU-2 LS14 output line) between the FLSCU-2 rack connector AB, pin 2D and the FQIC rack connector AB, pin 13K). 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 FUEL 燃油4(67)
