W DOC AIRBUS | TSM A320F

APU Fuel LP Valve operates with one Motor only

TASK 28-29-00-810-802-A
APU Fuel LP Valve operates with one Motor only

1. Possible Causes
  • ACTUATOR-APU FUEL LP VALVE [3QF]
  • RELAY 4KD
  • RELAY 5WF
  • RELAY 6WF
  • wiring
  • RELAY 6QC
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ASM 282201
AMM 28-29-00-710-001
Operational Test of the APU Low Pressure Fuel Valve using each individual Motor in turn
ASM 282901
AMM 28-29-51-000-001
Removal of the APU Fuel LP Valve Actuator
AMM 28-29-51-400-001
Installation of the APU Fuel LP Valve Actuator
3. Fault Confirmation
Subtask 28-29-00-710-052-A
A. Do the operational test of the APU LP fuel-valve using each individual motor in turn AMM 28-29-00-710-001.
4. Fault Isolation
Subtask 28-29-00-810-053-A
A. If the test with the circuit breaker 1QF open is not correct:
   (1) If the fault continues:
  • do a check of the RELAY 4KD and replace it if necessary.
   (2) If the fault continues:
  • do a check of the RELAY 5WF and replace it if necessary.
   (3) If the fault continues:
  • do a check of the RELAY 6WF and replace it if necessary.
   (4) If the APU fuel LP valve does not open.
  • do a check and repair the wiring from the:
    CB 2QF to the ACTUATOR VALVE 3QF B/B,
    RELAY 4KD A/C1 and ACTUATOR VALVE 3QF B/B.
     (a) If the fault continues:
  • do a check of the RELAY 6QC and replace it if necessary.
   (5) If the APU fuel LP valve does not close.
  • do a check and repair the wiring from the:
    RELAY 5WF A/A1 and ACTUATOR VALVE 3QF B/A,
    RELAY 6WF A/A1 and ACTUATOR VALVE 3QF B/A,
    ACTUATOR VALVE 3QF B/C and GND ASM 282901 and ASM 282201.
Subtask 28-29-00-810-054-A
B. If the test with the circuit breaker 2QF open is not correct:
   (1) If the fault continues:
  • do a check of the RELAY 4KD and replace it if necessary.
   (2) If the fault continues:
  • do a check of the RELAY 5WF and replace it if necessary.
   (3) If the fault continues:
  • do a check of the RELAY 6WF and replace it if necessary.
   (4) If the APU fuel LP valve does not open.
  • do a check and repair the wiring from the:
    CB 1QF to the ACTUATOR VALVE 3QF A/B,
    CB 3QC to the ACTUATOR VALVE 3QF A/B,
    RELAY 4KD A/B1 and ACTUATOR VALVE 3QF A/B ASM 282901 and ASM 282201.
     (a) If the fault continues:
  • do a check of the RELAY 6QC and replace it if necessary.
   (5) If the APU fuel LP valve does not close
  • do a check and repair the wiring from the:
    RELAY 5WF A/B1 and ACTUATOR VALVE 3QF A/A,
    RELAY 6WF A/B1 and ACTUATOR VALVE 3QF A/A,
    ACTUATOR VALVE 3QF B/C and GND ASM 282901 and ASM 282201.
Subtask 28-29-00-710-053-A
C. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:39:44 UTC
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