- protective sleeve
- wire(s)
- connector 25QA-A.
g Connect the new wire(s) of the fuel pump supply cable where
_ the wiring passes through the junction box (bracket assembly), by a splice(s) (Ref. ESPM 20-53-21).
h Make sure that the length of the new supply cable when
_ assembled, between the front face of the connector 25QA-A and the forward face of the cable guide (that shows outside the wing-skin) is 1320 mm (51.9685 in.).
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i If necessary, make a final adjustment in the length of the
_ supply cable across the lower surface of the wing during the installation of the rear fairing.
j Feed the surplus cable (small amount only) back up the
_ flexible conduit to the junction box (bracket assembly) on the rear spar.
k Make sure that the supply cable is held tight by the P-clip
_ at the cable guide.
NOTE : It is important that the fuel pump supply cable is
____ installed correctly as given in steps g_ thru k_. Incorrect installation of the cable can cause it to get damaged. If the cable is too short it will put tension on the wires and plug. If the cable is too long you will not be able to install the fairings correctly. This is because the unwanted cable (excess length) will become looped and get trapped during the installation of the intermediate and rear fairings.
l Install the front cover of the contactor box 107VU.
_
m Connect the connector 25QA-A to the fuel pump receptacle.
_
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 27QA-A from the PRESS SW-FUEL PUMP No. 2, L WING TK (27A) (Ref. AMM TASK 28-21-15-000-003).
(b) If the P/BSW-FUEL/L TK PUMPS/2 (15QA) FAULT legend stays on go to step (d). If the P/BSW-FUEL/L TK PUMPS/2 (15QA) FAULT legend goes off:
- do a check of and replace, if necessary, the PRESS SW-FUEL PUMP NO 2, L WING TK (27QA) (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 27QA (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)
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- the pressure switch fuel supply pipe-line between the fuel pump canister 2QM and the pressure switch 27QA.
NOTE : The pressure switch 27QA fuel supply pipe-line is also
____
connected to the CHECK VALVE-FUEL PUMP, L WING TK INR
(34QM).
The check valve 34QM 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/2 (15QA) FAULT legend stays on, do a check of the aircraft wiring (low pressure lines) (Ref. ASM 28-21/02) between the: 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(100)
