W DOC AIRBUS | TSM A320F

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

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

1. Possible Causes
  • NO LRU DETECTED
  • blockage of the APU inlet
  • APU internal damage
  • IGV ACTUATOR (P21)
  • APU [4005KM]
  • damage of the IGV linkage
  • IGV ACTUATOR (8014KM)
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 49-23-51-000-004
Removal of the Inlet Guide Vane - Actuator (131-9(A))
AMM 49-23-51-400-004
Installation of the Inlet Guide Vane - Actuator (131-9(A))
AMM 49-91-42-200-004
Inspection of the Metal Chip Detector (131-9(A))
3. Fault Confirmation
Subtask 49-00-81-710-252-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 49-00-81-710-106-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 DETECTED

   (4) Start the APU and apply Bleed Air for 20 seconds, minimum AMM 49-00-00-860-008.
4. Fault Isolation
Subtask 49-00-81-810-084-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
IGV ACTUATOR P21/ECB (59KD)

associated with Fault Code Number (FCN) 205

  • do a check for a blockage of the APU inlet .
   (1) If the fault continues:
  • do a check for APU internal damage :
    - do 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 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 (in the direction of the arrow on the housing).
    - make sure that the APU rotates freely.
     (a) If the APU rotates freely:
- remove the IGV ACTUATOR (P21) from the APU [4005KM] AMM 49-23-51-000-004.
  • do a check for damage of the IGV linkage .
  • . make sure that the IGV has a travel range of 1 -0.01 in. or +0.01 in. (25.400 -0.254 mm or +0.254 mm).
  • . measure the force of the IGV movement.
       1 If a force more than 20 lbf (8.8964 daN) is necessary to move the IGVs or the travel range is different than 1 -0.01 in. or +0.01 in. (25.400 -0.254 mm or +0.254 mm):
       2 If a force less than 20 lbf (8.8964 daN) is necessary to move the IGVs, the IGV linkage is OK:
     (b) If the APU does not rotate freely:
Subtask 49-00-81-810-084-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
IGV ACTUATOR (8014KM) / ECB (59KD)

associated with Fault Code Number (FCN) 205

  • do a check for a blockage of the APU inlet .
   (1) If the fault continues:
  • do a check for APU internal damage :
    - do 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 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 (in the direction of the arrow on the housing).
- make sure that the APU rotates freely.
     (a) If the APU rotates freely:
- remove the IGV ACTUATOR (8014KM) from the APU [4005KM] AMM 49-23-51-000-004.
  • do a check for damage of the IGV linkage .
  • . make sure that the IGV has a travel range of 1 -0.01 in. or +0.01 in. (25.400 -0.254 mm or +0.254 mm).
  • . measure the force of the IGV movement.
       1 If a force more than 20 lbf (8.8964 daN) is necessary to move the IGVs or the travel range is different than 1 -0.01 in. or +0.01 in. (25.400 -0.254 mm or +0.254 mm):
       2 If a force less than 20 lbf (8.8964 daN) is necessary to move the IGVs, the IGV linkage is OK:
     (b) If the APU does not rotate freely:
Subtask 49-00-81-710-107-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
"WTRUIB" 2025