W DOC AIRBUS | TSM A320F

APU AUTO SHUTDOWN - NO ACCELERATION, Starter Motor Fault (131-9(A))

TASK 49-00-81-810-834-A
APU AUTO SHUTDOWN - NO ACCELERATION, Starter Motor Fault (131-9(A))

1. Possible Causes
  • STARTER MOTOR SHOWS OPEN CIRCUIT
  • STARTER MOTOR SHOWS SHORT CIRCUIT
  • damage/contamination of the wiring and the electrical connections
  • electrical connections
  • aircraft wiring
  • MOTOR-STARTER [8KA]
  • APU internal damage
  • STARTER-CLUTCH MODULE
  • OIL-LUBE MODULE
  • FUEL CONTROL UNIT (P19)
  • APU [4005KM]
  • FUEL CONTROL UNIT (8022KM)
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 49-32-11-000-003
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 49-42-51-000-006
Removal of the Starter Motor (131-9(A))
AMM 49-42-51-200-007
Inspection/ Check of the Starter Motor (131-9(A))
AMM 49-42-51-400-006
Installation of the Starter Motor (131-9(A))
AMM 49-42-52-000-003
Removal of the Starter Motor Clutch (131-9(A))
AMM 49-42-52-400-003
Installation of Starter Motor Clutch (131-9(A))
AMM 49-91-42-200-004
Inspection of the Metal Chip Detector (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 49-00-81-710-156-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
    STARTER MOTOR SHOWS OPEN CIRCUIT

    STARTER MOTOR SHOWS SHORT CIRCUIT

   (4) Start the APU and apply Bleed Air for 20 seconds, minimum AMM 49-00-00-860-008.
4. Fault Isolation
Subtask 49-00-81-810-111-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 ACCELERATION
STARTER MOTOR (8KA)

associated with the Fault Code Number (FCN) 113

  • do a check and repair of damage/contamination of the wiring and the electrical connections of the STARTER MOTOR (8KA):
   (1) Make sure that the installation of the electrical connections is correct AMM 49-42-51-400-006.
   (2) If the electrical connections are damaged/contaminated:
  • do a check and repair of the aircraft wiring .
   (3) If the electrical connections are OK:
Subtask 49-00-81-810-121-A ** ON A/C NOT FOR ALL
B. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message:

NO ACCELERATION
STARTER MOTOR (8KA)

associated with the Fault Code Number (FCN) 114

  • do a check and repair of damage/contamination of the wiring and the electrical connections of the STARTER MOTOR (8KA):
   (1) Make sure that the installation of the electrical connections is correct AMM 49-42-51-400-006.
   (2) If the electrical connections are damaged/contaminated:
  • do a repair/cleaning.
   (3) If the electrical connections are OK:
  • 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 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.
    - make sure that the APU rotates freely.
     (a) If rotates the APU freely:
  • do a brush wear check AMM 49-42-51-200-007,
    and
  • examine the STARTER MOTOR (8KA) for signs of mechanical faults.
       1 If you cannot see the brush-wear indicator pin and/or there are signs of a mechanical fault:
       2 If you can see the brush-wear indicator pin and/or there are no signs of a mechanical fault:
  • turn the manual drive shaft of the STARTER MOTOR (8KA) in the counterclockwise direction (in the direction of the arrow on the housing) and make sure that the STARTER-CLUTCH MODULE engages correctly.
NOTE: The STARTER-CLUTCH MODULE engages correctly if:
  • it engages immediately,
  • it does not rub,
  • it does not make unusual noise.
  • turn the manual drive shaft of the STARTER MOTOR (8KA) in the counterclockwise direction (in the direction of the arrow on the housing) and make sure that the STARTER-CLUTCH MODULE engages correctly.
NOTE: The STARTER-CLUTCH MODULE disengages correctly if:
  • it disengages immediately,
  • the manual drive shaft of the STARTER MOTOR (8KA) turns freely,
  • it does not rub,
  • it does not make unusual noise.
         a If the STARTER-CLUTCH MODULE does not engage and/or disengage correctly:
         b If the STARTER-CLUTCH MODULE engages and disengage correctly:
         c If the fault continues:
     (b) If the APU does not rotate freely:
Subtask 49-00-81-810-121-B ** ON A/C NOT FOR ALL
B. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message: If the APU does not rotate freely:

NO ACCELERATION
STARTER MOTOR (8KA)

associated with the Fault Code Number (FCN) 114

  • Do a check and repair of damage/contamination of the wiring and the electrical connections of the STARTER MOTOR (8KA):
   (1) Make sure that the installation of the electrical connections is correct AMM 49-42-51-400-006.
   (2) If the electrical connections are damaged/contaminated:
  • Do a repair/cleaning.
   (3) If the electrical connections are OK:
  • 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 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.
  • Make sure that the APU rotates freely.
     (a) If rotates the APU freely:
  • Do a brush wear check AMM 49-42-51-200-007
  • Examine the STARTER MOTOR (8KA) for signs of mechanical faults.
       1 If you cannot see the brush-wear indicator pin and/or there are signs of a mechanical fault:
       2 If you can see the brush-wear indicator pin and/or there are no signs of a mechanical fault:
  • Turn the manual drive shaft of the STARTER MOTOR (8KA) in the counterclockwise direction (in the direction of the arrow on the housing) and make sure that the STARTER-CLUTCH MODULE engages correctly.
NOTE: The STARTER-CLUTCH MODULE engages correctly if:
  • It engages immediately,
  • It does not rub,
  • It does not make unusual noise.
  • Turn the manual drive shaft of the STARTER MOTOR (8KA) in the counterclockwise direction (in the direction of the arrow on the housing) and make sure that the STARTER-CLUTCH MODULE engages correctly.
NOTE: The STARTER-CLUTCH MODULE disengages correctly if:
  • It disengages immediately,
  • The manual drive shaft of the STARTER MOTOR (8KA) turns freely,
  • It does not rub,
  • It does not make unusual noise.
         a If the STARTER-CLUTCH MODULE does not engage and/or disengage correctly:
         b If the STARTER-CLUTCH MODULE engages and disengage correctly:
         c If the fault continues:
     (b) If the APU does not rotate freely:
Subtask 49-00-81-710-157-A ** ON A/C NOT FOR ALL
C. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:34:34 UTC
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