n Do the test given in Para. 3.B.(2)(b).
_
(3) If the fuel transfers:
(a) During the fuel transfer, disconnect the free connector 23QA-A from the PRESS SW-FUEL PUMP No. 1, L WING TK (23QA).
(b) If the P/BSW-FUEL/L TK PUMPS/1 (13QA) FAULT legend stays on go to step (d). If the P/BSW-FUEL/L TK PUMPS/1 (13QA) FAULT legend goes off:
- do a check of and replace, if necessary, the PRESS SW-FUEL PUMP NO 1, L WING TK (23QA) (Ref. AMM TASK 28-21-15-000-003) and (Ref. AMM TASK 28-21-15-400-001).
NOTE : The fuel-pump fuel pressure can be measured at the sealing
____ valve outlet using an ADAPTOR - SEQUENCE VALVE (99A28404000000). This can be installed in place of the pressure switch 23QA (Ref. AMM TASK 28-21-45-400-003).
(c) If the fault continues, or if no fuel pressure is shown on the gage of the ADAPTOR - SEQUENCE VALVE, make sure that these components are in the correct condition:
- the pressure switch sealing valve
- the pressure switch plug (banjo adaptor attachment bolt)
- the pressure switch fuel supply pipe-line between the fuel pump canister 1QM and the pressure switch 23QA.
NOTE : The pressure switch 23QA fuel supply pipe-line is also
____ 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.
「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 224
201-299, 401-499, Aug 01/05 CES
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 ALL
5. Close-up
________
R **ON A/C 001-049, 051-099, 101-105, 151-154, 201-207,
A. Close Access
(1) Make sure that the fuel pump is installed correctly and the two bolts that attach the pump have been torque tightened (Ref. AMM TASK 28-21-51-400-001).
(2) Make sure that the fuel pump supply cable end connector 21QA-A is connected to the fuel pump electrical receptacle.
(3) Install the fuel pump cover assembly (Ref. AMM TASK 28-21-51-400-001).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page 225
May 01/05 CES
(4) Install the fuel pump fairings (Ref. AMM TASK 28-21-49-400-001). Make sure that the fuel pump supply cable:
- is held correctly by the tape hooks (post SB 24-1070)
- does not get caught under the fairings (this is very important in the area adjacent to the fairing attachment bolts).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
**ON A/C ALL
R Post SB 28-1093 For A/C 001-049,051-099,101-105,151-154,201-207,
A. Close Access
(1) Make sure that the fuel pump is installed correctly and the two bolts that attach the pump have been torque tightened (Ref. AMM TASK 28-21-51-400-001).
(2) Make sure that the fuel pump supply cable end connector 21QA-A is connected to the fuel pump electrical receptacle.
(3) Install the fuel pump cover assembly (Ref. AMM TASK 28-21-51-400-001). 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(76)
