- push the FUEL LINE pushbutton switch 8QC again.

 (a) If the fault continues:

 - do a check of the RELAY 5QC and replace if necessary.

 (b) If the fault continues:

 - do a check of the RELAY 6QC and replace if necessary.

 (c) If the fault continues:

 - do a check of the RELAY 9QC and replace if necessary.

 (d) If the fault continues:

 - do a check of the RELAY 4KD and replace if necessary.
R (e) If the fault continues:
R - do a check of the RELAY 78KD and replace if necessary.

R (f) If the fault continues:

 - do a check and repair the wiring from the: CB 1QC to the RELAY 5QC A/B2 via the RELAY 9QC, CB 2QC to the RELAY 9QC A/A1, CB 2QC to the RELAY 9QC A/X1, RELAY 5QC A/B1,A3 to the APU FUEL PUMP 4QC A/A, RELAY 6QC A/B1 to the RELAY 5QC A/A2, RELAY 6QC A/C2 to the CB 1QF via the RELAYs 4KD, 5WF, 6WF, APU FUEL PUMP 4QC A/B to the GND (Ref. ASM 28-22/01) and (Ref. ASM 28-29/01).
 C. If the test gives on the lower ECAM display unit the FUEL LO PR advisory is on, but the test was correct with the L main fuel pump and the APU fuel pump:
 - replace the SWITCH-APU FUEL LP (5030QM) (Ref. AMM TASK 28-22-14-000-001) and (Ref. AMM TASK 28-22-14-400-001).
 (1) If the fault continues:
 - do a check and repair the wiring from the: APU FUEL LP SWITCH 5030QM P14 to the ECB 59KD AB/B7,B8 (Ref. ASM 49-61/02).
 「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 ∞∞28-22-00∞∞∞∞∞∞∞∞∞∞Page 203
 Aug 01/05 CES D. Do the test given in para. 3.

 5. Close-up
________
 A. Put the aircraft back to its initial configuration.
 「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 ∞∞28-22-00∞∞∞∞∞∞∞∞∞∞Page 204
 Aug 01/05R
 CES  TASK 28-22-00-810-803

 APU Fuel Pump does not operate with the FUEL LINE VENT Pushbutton Switch
 1. Possible Causes
_______________
 - RELAY 6QC

 - FUEL LINE VENT pushbutton switch (8QC)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
28-22-00-810-801 APU Fuel System - Low Pressure
 AMM 28-22-00-710-001 Operational Test of the APU Fuel-Pump System on

 Ground to Purge the Fuel Line
 AMM 28-22-00-710-006 Operational Test of the APU Fuel Pump
 ASM 28-22/01

 3. Fault Confirmation
__________________
 A. Do the operational test of the APU fuel pump system om ground (Ref. AMM TASK 28-22-00-710-001).
 NOTE : Make sure that the subsequent system is serviceable before you
____
 start the fault isolation procedure:

 - the main fuel pump system (Ref. 28-21-00),

 - the APU LP fuel shutoff system (Ref. 28-29-00).

 4. Fault Isolation
_______________
 A. If the test confirms the fault:
 - do the operational test of the APU fuel pump (Ref. AMM TASK 28-22-00-710-006).
 (1) If the test is not correct:

 - do the trouble shooting of the APU fuel system (Ref. TASK 28-22-00-810-801).

 (2) If the test is correct:

 - do a check of the RELAY 6QC and replace if necessary.
 (a) If the fault continues:
 - do a check of the FUEL LINE VENT pushbutton switch (8QC) and replace if necessary.
 「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 ∞∞28-22-00∞∞∞∞∞∞∞∞∞∞Page 205
 Aug 01/02R CES

 (b) If the fault continues:
 - do a check and repair the wiring from the: CB 3QC to the FUEL LINE VENT pushbutton switch (8QC) A/1, FUEL LINE VENT pushbutton switch (8QC) A/3 to the GND (Ref. ASM 28-22/01).
R B. Do the test given in para. 3.
 「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 ∞∞28-22-00∞∞∞∞∞∞∞∞∞∞Page 206
 Aug 01/02 CES

 CROSSFEED SYSTEM - FAULT ISOLATION PROCEDURES
_____________________________________________ TASK 28-23-00-810-801 R Fuel-Crossfeed Valve Does Not Open (Close) or Opens (Closes) Slowly WARNING : OBEY THE FUEL SAFETY PROCEDURES.
　
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