APU FUEL PUMP SYSTEM - FAULT ISOLATION PROCEDURES
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TASK 28-22-00-810-801
APU Fuel System - Low Pressure
1. Possible Causes
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- VALVE-AIR RELEASE, L WING TK (86QM)
- PRESS SWITCH-APU FUEL PRESSURE (7QC)
- PUMP-APU FUEL (4QC)
- SWITCH-APU FUEL LP (5030QM)
- RELAY 6QC
- RELAY 5QC
- wiring
- RELAY 9QC
- RELAY 4KD R - RELAY 78KD
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 28-21-41-000-001 Removal of the Low Pressure (LP) Air-Release-Valve 86QM(87QM) AMM 28-21-41-400-001 Installation of the Low Pressure (LP)
Air-Release-Valve 86QM(87QM) AMM 28-22-14-000-001 Removal of the APU Fuel LP-Switch 5030QM AMM 28-22-14-400-001 Installation of the APU Fuel LP-Switch 5030QM AMM 28-22-15-000-001 Removal of the APU Fuel Pressure Switch (7QC) AMM 28-22-15-400-001 Installation of the APU Fuel Pressure Switch (7QC) AMM 28-22-51-000-001 Removal of the APU Fuel Pump (4QC) AMM 28-22-51-400-001 Installation of the APU Fuel Pump (4QC) AMM 49-31-00-710-001 Operational Test of the APU Fuel Low Pressure Circuit
(GTCP 36-300) AMM 49-31-00-710-002 Operational Test of the APU Fuel Low Pressure Circuit
(APS 3200)
ASM 28-22/01
ASM 28-29/01
ASM 49-61/02
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3. Fault Confirmation
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**ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,
A. Do the operational test of the APU fuel low pressure circuit (Ref. AMM TASK 49-31-00-710-001).
NOTE : Make sure that the subsequent system is serviceable before you
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start the fault isolation procedure:
- the main fuel pump system (Ref. 28-21-00),
- the APU LP fuel shutoff system (Ref. 28-29-00).
R **ON A/C 106-149, 211-299, 301-399, 401-499,
A. Do the operational test of the APU fuel low pressure circuit (Ref. AMM TASK 49-31-00-710-002).
NOTE : Make sure that the subsequent system is serviceable before you
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start the fault isolation procedure:
- the main fuel pump system (Ref. 28-21-00),
- the APU LP fuel shutoff system (Ref. 28-29-00).
**ON A/C ALL
4. Fault Isolation
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A. If the test gives the subsequent results: - on the lower ECAM display unit, the FUEL LO PR advisory is off with the L main fuel pump in operation,
- on the lower ECAM display unit, the FUEL LO PR advisory comes on with the APU fuel pump in operation.
(1) replace the VALVE-AIR RELEASE, L WING TK (86QM) (Ref. AMM TASK 28-21-41-000-001) and (Ref. AMM TASK 28-21-41-400-001).
B. If the test gives the subsequent results: .on the lower ECAM display unit, the FUEL LO PR advisory is off with the L main fuel pump in operation, .on the lower ECAM display unit, the FUEL LO PR advisory comes on and the APU fuel pump does not operate:
- push the FUEL LINE pushbutton switch 8QC to operate the APU FUEL PUMP 4QC.
(1) If the APU FUEL PUMP 4QC operates:
- replace the PRESS SWITCH-APU FUEL PRESSURE (7QC) (Ref. AMM TASK 28-22-15-000-001) and (Ref. AMM TASK 28-22-15-400-001).
(a) If the fault continues:
- do a check of the RELAY 6QC and replace if necessary.
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(b) If the fault continues:
- do a check of the RELAY 5QC and replace if necessary.
(c) If the fault continues:
- do a check and repair the wiring from the: CB 2QC to the RELAY 6QC A/B2, RELAY 6QC A/C3 to the PRESS SWITCH 7QC A/B, RELAY 5QC A/X1 to the PRESS SWITCH 7QC A/A, RELAY 5QC A/X2 to the GND (Ref. ASM 28-22/01).
(2) If the APU FUEL PUMP 4QC does not operate:
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