「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 A243
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20 If the 115VAC is not available at the connector 38QA, do a
__ test of the aircraft wiring (three phase supply) between the CNTOR-CTR PUMP 2 SPLY (36QA) and the PUMP-FUEL No 2, CTR TK (38QA) connector 38QA-A (Ref. AWM 28-21-06).
NOTE : The aircraft wiring can be divided into two sections
____ (lengths) at the connector 7577VC. The section of the power supply cable between 7577VC-A and the fuel pump connector 38QA-A is located in a fuel and vapour zone (Ref. ESPM 20-31-36).
Do the test as follows:
a Continuity test, with an (intrinsically safe) multimeter,
_ of each three phase wire (from end to end) (Ref. ESPM 20-52-21).
b Insulation test, with an (intrinsically safe) 500VDC
_ insulation tester, between each phase wire (pole) and ground (Ref. ESPM 20-52-24).
c Insulation test, with an (intrinsically safe) 500VDC
_ insulation tester, between each phase wire and the other two wires (pole to pole) (Ref. ESPM 20-52-24).
d Repair or replace the unserviceable wiring and connectors.
_ If a wire (between the connector 7577VC-A and the fuel pump connector 38QA-A, that goes through the pressure seal (bung) 7508VP) is found to be damaged, the complete section (length) of (each) wire must be replaced.
e Install the front cover of the contactor box 107VU.
_
f Connect the fuel pump supply cable end connector 38QA-A to
_ the fuel pump receptacle.
g Do the Functional Test of the Center Tank Fuel Control
_ (Manual Mode) (Ref. AMM TASK 28-21-00-720-001).
(3) If the fuel transfers:
(a) Set the CTR TK PUMP 2 P/BSW (34QA) to OFF (release out). This will de-energize the contactor 36QA and remove the 28VDC from the pressure switch.
(b) Open the right main landing gear door for access (Ref. AMM TASK 32-12-00-010-001).
(c) Get access to center tank fuel pump No. 2, pressure switch 40QA (Ref. AMM TASK 28-21-15-000-003).
「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 A244
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(d) Disconnect the free connector 40QA-A from the PRESS SW-FUEL PUMP NO 2, CTR TK (40QA).
(e) Set the CTR TK PUMP 2 P/BSW (34QA) to ON (push in). This will energize the contactor 36QA.
(f) See if the P/BSW (34QA) FAULT legend is on or off (with the pressure switch disconnected and the P/BSW pushed (in)).
(g) Set the CTR TK PUMP 2 P/BSW (34QA) to OFF (release out). This will de-energize the contactor 36QA.
(h) If the P/BSW-FUEL/CTR TK/PUMP 2 (34QA) FAULT legend stays on go to step (j). If the P/BSW-FUEL/CTR TK/PUMP 2 (34QA) FAULT legend goes off:
- do a check of, and replace if necessary, the PRESS SW-FUEL PUMP NO 2, CTR TK (40QA) (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 safety
____ valve outlet using an ADAPTOR - SEQUENCE VALVE (99A28404000000). This can be installed in place of the pressure switch 40QA (Ref. AMM TASK 28-21-45-400-003).
(i) 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 safety valve
- the pressure switch plug (banjo adaptor attachment bolt)
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(130)
