(b) Do a check of the applicable Fuel Return Valve (FRV) (Ref. AMM TASK 73-11-50-720-001) and replace, if necessary, (Ref. AMM TASK 73-11-50-000-001) and (Ref. AMM TASK 73-11-50-400-001).
(c) If the fault continues: 1 Go to Para. 3.B. and do the examination of the fault symptoms
_ again for a possible alternative entry point(s).
2 Go to Para. 4.B. - Fuel Recirculation (Cooling) Pipe
_
Trouble-shooting.
(6) Remove the related FLSCU (Ref. AMM TASK 28-46-34-000-001).
(7) If the ground seen in step (4):
(a) Is still shown (with the FLSCU removed): 1 Do a check of the aircraft wiring (IDG fuel logic output wire)
_
(Ref. ASM 28-16/01) between:
- the related FLSCU rack connector AA, pin 4D and the related EIU rack connector AA, pin 2A.
2 Repair all the unserviceable wiring and connectors.
_ 3 Install the FLSCU removed in step (6) (Ref. AMM TASK 28-46-34-
_
400-001).
4 Do the test given in step (3).
_
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5_ Install the EIU removed in step (1) or (2) (Ref. AMM TASK 73-
25-34-400-040).
6_ Do the test given in Para. 3.B.
(b) Is not shown (with the FLSCU removed):
1 Replace the FLSCU-1 (7QJ) (FLSCU-2 (9QJ)) with a serviceable
_ item and install (Ref. AMM TASK 28-46-34-400-001).
2 Do a check of the aircraft wiring (that is common to FLSCU-1
_ and FLSCU-2) (Ref. ASM 28-16/01) between:
- the FLSCU-1 rack connector AA, pin 14C and the FLSCU-2 rack connector AA, pin 14D
- the FLSCU-1 rack connector AA, pin 14D and the FLSCU-2 rack connector AA, pin 14C
- the FLSCU-1 rack connector AA, pin 12D and the actuator-crossfeed valve free connector 5QE-A, pin B
- the FLSCU-2 rack connector AA, pin 12D and the actuator-crossfeed valve free connector 5QE-A, pin B.
3 For a IDG 1 failure, do a check of the aircraft wiring (Ref.
_ ASM 28-16/01) between:
- the FLSCU-1 rack connector AA, pin 13C and the PRESS SW-FUEL PUMP No. 1, L WING TK connector 23QA-A, pin C
- the FLSCU-1 rack connector AA, pin 13D and the PRESS SW-FUEL PUMP No. 2, L WING TK connector 27QA-A, pin C
- the FLSCU-1 rack connector AA, pin 12C and the PRESS SW-FUEL PUMP No. 1, CTR TK connector 39QA-A, pin C
- the FLSCU-1 rack connector AA, pin 1D and the C/B-FUEL/CTR TK/PUMP1 AND 2/CTL AND IND (31QA).
4 For a IDG 2 failure, do a check of the aircraft wiring (Ref.
_ ASM 28-16/01) between:
- the FLSCU-2 rack connector AA, pin 13C and the PRESS SW-FUEL PUMP No. 1, R WING TK connector 24QA-A, pin C
- the FLSCU-2 rack connector AA, pin 13D and the PRESS SW-FUEL PUMP No. 2, R WING TK connector 28QA-A, pin C
- the FLSCU-2 rack connector AA, pin 12C and the PRESS SW-FUEL PUMP No. 2, CTR TK connector 40QA-A, pin C
- the FLSCU-2 rack connector AA, pin 1D and the C/B-FUEL/CTR TK/PUMP1 AND 2/CTL AND IND (32QA).
5 Repair all the unserviceable wiring and connectors.
_
6 Install the FLSCU removed in step (6) (Ref. AMM TASK 28-46-34-
_ 400-001).
7 Do the test given in step (3).
_
8 Install the EIU removed in step (1) or (2) (Ref. AMM TASK 73-
_ 25-34-400-040).
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CES
9 Do the test given in Para. 3.B.
_
B. Procedure - Fuel Recirculation (Cooling) Pipe Trouble-shooting
(1) Do a check of and replace, if necessary:
(a) The CHECK VALVE-FUEL RECIRCULATION, L (122QM) (CHECK VALVE-FUEL RECIRCULATION, R (123QM)) (Ref. AMM TASK 28-16-42-000-001) and (Ref. AMM TASK 28-16-42-400-001). 中國航空網(wǎng) 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1(63)
