W DOC AIRBUS | TSM A320F

APU AUTO SHUTDOWN - NO FLAME, No EGT Rise during Start (131-9(A))

TASK 49-00-81-810-821-A
APU AUTO SHUTDOWN - NO FLAME, No EGT Rise during Start (131-9(A))

1. Possible Causes
  • NO LRU FAULT DETECTED
  • damage/leakage of the APU FUEL SYSTEM
  • aircraft fuel-line of the APU-pump fuel-system
  • FUEL FILTER
  • IGNITER PLUG
  • IGNITER LEAD
  • IGNITION UNIT (P10)
  • FCU CONTROL UNIT drive
  • LUBE OIL MODULE (8080KM)
  • FUEL CONTROL UNIT (P19)
  • FLOW DIVIDER
  • PRIMARY AND SECONDARY FUEL NOZZLES
  • APU INLET PRESSURE TRANSDUCER (P22)
  • APU INLET TEMPERATURE SENSOR (P6)
  • ELECTRONIC CONTROL BOX [59KD]
  • APU [4005KM]
  • FUEL FILTER (8028KM)
  • IGNITION UNIT (8030KM)
  • FUEL CONTROL UNIT (8022KM)
  • FLOW DIVIDER (8024KM)
  • APU INLET PRESSURE TRANSDUCER (8048KM)
  • APU INLET TEMPERATURE SENSOR (8010KM)
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
WRENCH - RATCHET
No specific
AR
WRENCH - SOCKET
 B. Referenced Information
REFERENCE
DESIGNATION
AMM 28-22-00-710-001
Operational Test of the APU Fuel-Pump System on Ground to Purge the Fuel Line
AMM 49-00-00-790-003
Leak Test of the APU
AMM 49-00-00-860-008
APU Start by External Power
AMM 49-11-11-000-004
Removal of the Power Plant (APU) (131-9(A))
AMM 49-11-11-400-004
Installation of the Power Plant (APU) (131-9(A))
AMM 49-23-14-000-001
Removal of the Sensor-APU Inlet Temperature (131-9(A))
AMM 49-23-14-400-001
Installation of the Sensor-APU Inlet Temperature (131-9(A))
AMM 49-31-41-000-003
Removal of the Primary and Secondary Fuel-Nozzle (131-9(A))
AMM 49-31-41-400-003
Installation of the Primary and Secondary Fuel- Nozzle (131-9(A))
AMM 49-32-11-000-003
Removal of the Fuel Control Unit (FCU) (131-9(A))
AMM 49-32-11-400-003
Installation of the Fuel Control Unit (FCU) (131-9(A))
AMM 49-32-13-000-001
Removal of Flow Divider and Solenoid Valve (131-9(A))
AMM 49-32-13-400-001
Installation of Flow Divider and Solenoid Valve (131-9(A))
AMM 49-32-41-920-001
Replacement of the Fuel Filter (131-9(A))
AMM 49-41-38-000-003
Removal of the Ignition Unit (131-9(A))
AMM 49-41-38-400-003
Installation of the Ignition Unit (131-9(A)
AMM 49-41-41-000-005
Removal of Igniter Plug (131-9(A))
AMM 49-41-41-400-004
Installation of Igniter Plug (131-9(A))
AMM 49-41-43-000-003
Removal of Igniter Lead (131-9(A))
AMM 49-41-43-400-003
Installation of Igniter Lead (131-9(A))
AMM 49-51-21-000-001
Removal of the Transducer - APU Inlet Pressure (131-9(A))
AMM 49-51-21-400-001
Installation of the Transducer - APU Inlet Pressure (131-9(A))
AMM 49-61-34-000-003
Removal of the Electronic Control Box (ECB) (131-9(A))
AMM 49-61-34-400-003
Installation of the Electronic Control Box (ECB) (131-9(A))
AMM 49-91-45-000-003
Removal of Oil Lube Module (131-9(A))
AMM 49-91-45-400-003
Installation of Oil Lube Module (131-9(A))
3. Fault Confirmation
Subtask 49-00-81-710-130-A ** ON A/C NOT FOR ALL
A. Read-out of ECB Trouble-Shooting Data
   (1) Put the APU MASTER SW to the ON position.
   (2) Get access to the APU SHUTDOWN report.
   (3) Push the '>' adjacent to LRU DATA:
  • the MCDU menu shows
    NO LRU FAULT DETECTED

   (4) Start the APU and apply Bleed Air for 20 seconds, minimum AMM 49-00-00-860-008.
4. Fault Isolation
Subtask 49-00-81-810-097-A ** ON A/C NOT FOR ALL
A. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message:

NO FLAME
CHECK IGNITION SYSTEM/FCU/ECB (59KD)

associated with the Fault Code Number (FCN) 209

   (1) If there is damage/leakage in the APU FUEL SYSTEM
  • Do a repair.
   (2) If the APU FUEL SYSTEM is OK:
     (a) If the fault continues:
     (b) If the fault continues:
     (c) If the fault continues:
     (d) If the fault continues:
     (e) If the fault continues:
  • Do a check of the FCU CONTROL UNIT drive :
    - Remove the FUEL CONTROL UNIT (P19) AMM 49-32-11-000-003.
    - Remove the end cap from the STARTER MOTOR (8KA).
    - Use a WRENCH - SOCKET and a WRENCH - RATCHET on the shaft of the STARTER MOTOR (8KA) to turn the APU counterclockwise
    - Verify if the LUBE PUMP shaft turns.
       1 If the LUBE PUMP shaft does not turn:
       2 If the LUBE PUMP shaft turns:
         a If the fault continues:
         b If the fault continues:
         c If the fault continues:
NOTE: The APU can have a normal start on the ground and fail a start in the air if the proper ambient corrections are not made (calibration shift).
         d If the fault continues:
NOTE: The APU can have a normal start on the ground and fail a start in the air if the proper ambient corrections are not made (calibration shift).
         e If the fault continues:
         f If the fault continues:
Subtask 49-00-81-810-097-B ** ON A/C NOT FOR ALL
A. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message:

NO FLAME
CHECK IGNITION SYSTEM / FCU(8022KM)/FUEL SUPPLY

associated with the Fault Code Number (FCN) 209

  • do a check for damage/leakage of the APU FUEL SYSTEM.
   (1) If there is damage/leakage in the APU FUEL SYSTEM
  • Do a repair.
   (2) If the APU FUEL SYSTEM is OK:
     (a) If the fault continues:
     (b) If the fault continues:
     (c) If the fault continues:
     (d) If the fault continues:
     (e) If the fault continues:
  • Do a check of the FCU CONTROL UNIT drive :
    - Remove the FUEL CONTROL UNIT (8022KM) AMM 49-32-11-000-003.
    - Remove the end cap from the STARTER MOTOR (8KA).
    - Use a WRENCH - SOCKET and a WRENCH - RATCHET on the shaft of the STARTER MOTOR (8KA) to turn the APU counterclockwise
    - Verify if the LUBE PUMP shaft turns.
       1 If the LUBE PUMP shaft does not turn:
       2 If the LUBE PUMP shaft turns:
         a If the fault continues:
         b If the fault continues:
         c If the fault continues:
NOTE: The APU can have a normal start on the ground and fail a start in the air if the proper ambient corrections are not made (calibration shift).
         d If the fault continues:
NOTE: The APU can have a normal start on the ground and fail a start in the air if the proper ambient corrections are not made (calibration shift).
         e If the fault continues:
         f If the fault continues:
Subtask 49-00-81-710-131-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:34:33 UTC
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