connected to the CHECK VALVE-FUEL PUMP, L WING OUTR
(33QM).
The check valve 33QM is in one of the primary fuel supply
pipe-lines to the left wing scavenge jet pumps 66QM and
67QM.
1_ Repair/replace the components that are unserviceable.
2_ Do the test given in Para. 3.B.(2)(b).
(d) If the P/BSW-FUEL/L TK PUMPS/1 (13QA) FAULT legend stays on, do a check of the aircraft wiring (low pressure lines) (Ref. ASM 28-21/01) between the:
- pressure switch connector 23QA-A, pin C and the FLSCU-1 rack connector 7QJ-AA, terminal 13C
- pressure switch connector 23QA-A, pin C and the SDAC-1 rack connector 1WV1-AA, terminal 1D
- pressure switch connector 23QA-A, pin C and the SDAC-2 rack connector 1WV2-AA, terminal 1D
- pressure switch connector 23QA-A, pin C and the BOARD-ANN LT TEST & INTFC connector 6LP-A, terminal 14
- BOARD-ANN LT TEST & INTFC connector 6LP-A, terminal 13 and the P/BSW-FUEL/L TK PUMPS/1 connector 13QA-A, terminal 7.
NOTE : A short circuit to ground on one of these lines can cause:
____
- a false LO PR warning to be generated within the FWC
- the FAULT legend/lamp to come on incorrectly. It is possible that a short circuit to ground on one of these lines can come from one of the LRUs as follows:
- BOARD-ANN LT TEST & INTFC (6LP)
- FLSCU-1 (7QJ)
- SDAC-1 (1WV1)/SDAC-2 (1WV2).
(e) Repair the unserviceable wiring and connectors.
(f) Do the test given in Para. 3.B.(2)(b).
**ON A/C 301-399,
A. Procedure
(1) If a fuel low pressure indication is shown for the left wing tank fuel pump No. 1 (21QA):
- do a fuel transfer (Ref. AMM TASK 28-21-00-710-007) use the left wing tank fuel pump No. 1 to do the fuel transfer.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-105, 151-154, ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page 210
201-207, 301-399, May 01/05 CES
R (2) If the fuel starts to transfer go to step (3). If the fuel does not
R start to transfer:
R (a) Set the L TK PUMPS 1 P/BSW (13QA) to OFF (release out). This will
R de-energize the contactor 17QA.
R (b) Before you do more steps, make sure that the wing area adjacent
R to the left outer fuel pump 21QA fairings and cover is not
R contaminated with fuel from a fuel leak or spillage.
R 1_ If necessary:
R a_ Repair all the leaks:
R - (Ref. AMM TASK 51-76-12-300-001)
R - (Ref. AMM TASK 51-76-12-300-002)
R - (Ref. SIL 57-0086).
R b_ Clean the area of the fuel spillage.
R (c) Remove all the fuel pump 21QA cable fairings (Ref. AMM TASK 28-R 21-49-000-001) and cover assembly (Ref. AMM TASK 28-21-51-000-R 001).
R (d) Disconnect the supply cable end connector 21QA-A from the fuel
R pump receptacle.
R (e) If, in step (c) or (d), any damage can be seen on the supply
R cable or the aircraft structure, go to step (j) 1_.
R (f) Set the L TK PUMPS 1 P/BSW (13QA) to ON (push in). This will
R energize the contactor 17QA and the 115VAC three phases will be
R supplied to the fuel pump connector 21QA-A.
R (g) Use a multimeter to do a test, to make sure that each of the
R 115VAC three phases are available at the connector 21QA-A (Ref.
R ASM 28-21/01).
R (h) Set the L TK PUMPS 1 P/BSW (13QA) to OFF (release out). This will
R de-energize the contactor 17QA.
R 1_ Use a multimeter to do a test, to make sure that each of the
R 115VAC three phases are not available at the connector 21QA-A.
R NOTE : This is to make sure that the contactor 17QA does not
____ R stay in the on position (stuck/held on).
R (i) If the 115VAC three phase supply voltage measured in step (g) is R correct, replace the PUMP-FUEL NO 1, L WING TK (21QA) (Ref. AMM R TASK 28-21-51-000-001) and (Ref. AMM TASK 28-21-51-400-001).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 301-399, ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page 211
May 01/04 CES
(j) If the 115VAC three phase supply voltage measured in step (g) is not correct (no voltage, incorrect voltage or a phase is missing), do all the sub-steps that follow:
1 Clean and dry:
_
- all the fuel pump cable fairings
- the fuel pump cover assembly
- the fuel pump supply cable and the related end connector
- the aircraft wing structure adjacent to the route of the supply cable across the wing surface 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 FUEL 燃油1(69)
