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NOTE : If necessary, you can divide the supply cable between
____ the contactor 17QA and the connector 21QA-A into two sections at the connector 4009VC (Ref. AWM 28-21-01).
Do the test as follows:
a Continuity test, with a multimeter, of each three phase
_ wire (from end to end) (Ref. ESPM 20-52-21).
b Insulation test, with a 500VDC insulation tester, between
_ each phase wire (pole) and ground (Ref. ESPM 20-52-24).
c Insulation test, with a 500VDC insulation tester, between
_ each phase wire and the other two wires (pole to pole) (Ref. ESPM 20-52-24).
d If during the wiring test in step 23_ the wiring is
_ unserviceable, repair/replace the unserviceable wiring and connectors.
e If the fuel pump supply cable is found to be unserviceable
_ (where it is routed across the lower surface of the wing) repair as follows:
CAUTION : DO NOT USE IN-LINE SPLICES TO REPAIR SECTIONS OF
_______ ELECTRICAL CABLE THAT ARE BEHIND A FAIRING OR IN A CONDUIT. THIS WILL MAKE SURE THAT IT IS POSSIBLE TO SEE THE REPAIR FOR AN INSPECTION (REF. ESPM 20-53-29).
f If necessary, replace the unserviceable:
_
- protective sleeve
- wire(s)
- connector 21QA-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 21QA-A and the forward face of the cable guide (that shows outside the wing-skin) is 1345 mm (52.9527 in.).
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.
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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 21QA-A to the fuel pump receptacle. 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(75)
