W DOC AIRBUS | TSM A320F

APU AUTO SHUTDOWN - OVERTEMPERATURE (APU Start), High Temperature during APU Start (131-9(A))

TASK 49-00-81-810-812-A
APU AUTO SHUTDOWN - OVERTEMPERATURE (APU Start), High Temperature during APU Start (131-9(A))

1. Possible Causes
  • NO LRU FAULT DETECTED
  • APU internal damage
  • FUEL CONTROL UNIT (P19)
  • APU INLET PRESSURE TRANSDUCER (P22)
  • APU INLET TEMPERATURE SENSOR (P6)
  • ELECTRONIC CONTROL BOX [59KD]
  • FUEL CONTROL UNIT (8022KM)
  • 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 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 49-16-00-200-002
Detailed Inspection of APU Air Intake, Diffuser Elbow, Seals and Felt Metal (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 49-32-11-000-003
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 49-51-21-000-001
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 49-91-42-200-004
Inspection of the Metal Chip Detector (131-9(A))
3. Fault Confirmation
Subtask 49-00-81-710-253-A ** ON A/C NOT FOR ALL
A. Check/Test
   (1) Do a visual inspection and make sure that you do not find damage and/or unwanted material in the air intake system and/or on the engine air-intake screen AMM 49-16-00-200-002.
   (2) Do a visual inspection and make sure that you do not find damage and/or unwanted material in the exhaust system.
NOTE: The torque limit is 372 lbf.in (4.20 m.daN). Do not turn the shaft with a torque more than the limit. A torque more than the limit will damage the component.
   (3) Remove the end cap from the starter motor (8KA).
   (4) Turn the manual drive shaft of the starter motor (8KA) in a counterclockwise direction (in the direction of the arrow on the housing).
NOTE: Turn the manual drive shaft of the starter motor with a torque wrench. Made sure that the drag is 10 lbf.in (0.11 m.daN) to 60 lbf.in (0.68 m.daN).
     (a) If you find that the drag of the APU rotors, bearings and gears is too much and they do rub or make unusual noise:
Subtask 49-00-81-710-110-A ** ON A/C NOT FOR ALL
B. 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 49-00-81-810-086-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:

OVERTEMPERATURE
FUEL CONTROL UNIT P19 / FLOW DIVIDER ASSEMBLY

associated with Fault Code Number (FCN) 206

  • do a check for APU internal damage :
    - do a check for contamination of the MAGNETIC-DRAIN PLUG AMM 49-91-42-200-004.
NOTE: If the MAGNETIC-DRAIN PLUG is not contaminated, continue without starting the APU
  • .
    - remove the end cap of 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 (in the direction of the arrow on the housing).
    - make sure that the APU rotates freely.
   (1) If the APU rotates freely:
     (a) 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).
     (b) 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).
     (c) If the fault continues:
   (2) If the APU does not rotate freely:
Subtask 49-00-81-810-086-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:

OVERTEMPERATURE
FUEL CTRL UNIT (8022KM)/ FLOW DIVIDER (8024KM)

associated with Fault Code Number (FCN) 206

  • do a check for APU internal damage :
    - do a check for contamination of the MAGNETIC-DRAIN PLUG AMM 49-91-42-200-004.
NOTE: If the MAGNETIC-DRAIN PLUG is not contaminated, continue without starting the APU
  • .
    - remove the end cap of 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 (in the direction of the arrow on the housing).
    - make sure that the APU rotates freely.
   (1) If the APU rotates freely:
     (a) 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).
     (b) 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).
     (c) If the fault continues:
   (2) If the APU does not rotate freely:
Subtask 49-00-81-710-111-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:34:32 UTC
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