- 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).
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
Post SB 28-1093 For A/C 001-049,051-099,101-105,151-154,201-207,
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.
(2) If the fuel starts to transfer go to step (3). If the fuel does not start to transfer:
(a) Set the L TK PUMPS 1 P/BSW (13QA) to OFF (release out). This will de-energize the contactor 17QA.
(b) Before you do more steps, make sure that the wing area adjacent to the left outer fuel pump 21QA fairings and cover is not contaminated with fuel from a fuel leak or spillage.
1 If necessary:
_ a Repair all the leaks:
_
- (Ref. AMM TASK 51-76-12-300-001)
- (Ref. AMM TASK 51-76-12-300-002)
- (Ref. SIL 57-0086).
b Clean the area of the fuel spillage.
_
(c) Remove all the fuel pump 21QA cable fairings (Ref. AMM TASK 28-21-49-000-001) and cover assembly (Ref. AMM TASK 28-21-51-000-001).
(d) Disconnect the supply cable end connector 21QA-A from the fuel pump receptacle.
(e) If, in step (c) or (d), any damage can be seen on the supply cable or the aircraft structure, go to step (j) 1_.
「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 ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page 218
Aug 01/05 CES
(f) Set the L TK PUMPS 1 P/BSW (13QA) to ON (push in). This will energize the contactor 17QA and the 115VAC three phases will be supplied to the fuel pump connector 21QA-A.
(g) Use a multimeter to do a test, to make sure that each of the 115VAC three phases are available at the connector 21QA-A (Ref. ASM 28-21/01).
(h) Set the L TK PUMPS 1 P/BSW (13QA) to OFF (release out). This will de-energize the contactor 17QA.
1 Use a multimeter to do a test, to make sure that each of the
_ 115VAC three phases are not available at the connector 21QA-A.
NOTE : This is to make sure that the contactor 17QA does not
____ stay in the on position (stuck/held on).
(i) If the 115VAC three phase supply voltage measured in step (g) is correct:
1 Replace the PUMP-FUEL NO 1, L WING TK (21QA) (Ref. AMM TASK
_ 28-21-51-000-001) and (Ref. AMM TASK 28-21-51-400-001).
2 If the fault continues, replace the SEQUENCE VALVE of the
_ fuel-pump (21QA) (Ref. AMM TASK 28-21-45-000-001) and (Ref. AMM TASK 28-21-45-400-003).
(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
- the aircraft wing structure at the rear spar, adjacent to the landing light, where the fuel pump supply cable leaves the conduit and passes through the cable guide (bottom skin).
2 Make sure that good lighting is available.
_ Do a visual inspection and look for distortion (pinched or streched) damage (chafed or cut), discoloration, overheating (burnt/melted or arcing) liquid contamination, loose electrical connection or incorrect assembly, of the items that follow:
- the electrical receptacle
- the supply cable end connector 21QA-A
- the supply cable
- the cable guide
「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, 101-149, 151-199, ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page 219
201-299, 401-499, Aug 01/05 CES
- the fuel pump fairings
- the aircraft wing structure adjacent to the route of the supply cable (across the wing surface and at the rear spar) 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(73)
