W DOC AIRBUS | TSM A320F

APU AUTO SHUTDOWN - AIR INTAKE NOT OPEN, Air Intake Fault (131-9(A))

TASK 49-00-81-810-828-A
APU AUTO SHUTDOWN - AIR INTAKE NOT OPEN, Air Intake Fault (131-9(A))

1. Possible Causes
  • INLET FLAP SHOWS FLAP LOSS OF OPEN INDICATION
  • INLET FLAP SHOWS FLAP FAILED TO OPEN
  • INLET FLAP SHOWS FLAP CLOSE CIRCUIT OPEN
  • INLET FLAP SHOWS FLAP OPEN HIGH CURRENT
  • damage/contamination of the electrical connector 7527VC
  • aircraft wiring
  • AIR INTAKE FLAP ACTUATOR (4015KM)
  • ELECTRONIC CONTROL BOX [59KD]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 49-00-00-860-008
APU Start by External Power
ASM 491601
AMM 49-16-51-000-003
Removal of the Air-Intake Flap Actuator (131-9(A))
AMM 49-16-51-400-003
Installation of the Air-Intake Flap Actuator (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))
3. Fault Confirmation
Subtask 49-00-81-710-146-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
    INLET FLAP SHOWS FLAP LOSS OF OPEN INDICATION
    or
    INLET FLAP SHOWS FLAP FAILED TO OPEN
    or
    INLET FLAP SHOWS FLAP CLOSE CIRCUIT OPEN
    or
    INLET FLAP SHOWS FLAP OPEN HIGH CURRENT

   (4) Start the APU and apply Bleed Air for 20 seconds, minimum AMM 49-00-00-860-008.
4. Fault Isolation
Subtask 49-00-81-810-106-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:

AIR INTAKE NOT OPEN
AIR INTAKE FLAP ACTUATOR

associated with Fault Code Numbers (FCN) 64, 65, 68, 70 or 71

  • do a check for damage/contamination of the electrical connector 7527VC of the AIR INTAKE FLAP-ACTUATOR.
   (1) If the electrical connector 7527VC is damaged/contaminated:
  • do a repair/cleaning.
   (2) If the electrical connector 7527VC is OK:
  • do a check and repair of the aircraft wiring from
    the ECB (59KD) AC/5,4 to the electrical connector 7527VCA/J,K
    and
    the ECB (59KD) AB/G2,G3,G4,G5 to the electrical connector 7527VCA/D,C,E,B
    and
    the electrical connector 7527VCA/A,L,F, to GND
    ASM 491601.
     (a) If the aircraft wiring is OK:
     (b) If the fault continues:
Subtask 49-00-81-810-106-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:

AIR INTAKE NOT OPEN
AIR INTAKE FLAP ACTUATOR (4015KM)

associated with Fault Code Numbers (FCN) 64, 65, 68, 70 or 71

  • do a check for damage/contamination of the electrical connector 7527VC of the AIR INTAKE FLAP-ACTUATOR (4015KM).
   (1) If the electrical connector 7527VC is damaged/contaminated:
  • do a repair/cleaning.
   (2) If the electrical connector 7527VC is OK:
  • do a check and repair of the aircraft wiring from
    the ECB (59KD) AC/5,4 to the electrical connector 7527VCA/J,K
    and
    the ECB (59KD) AB/G2,G3,G4,G5 to the electrical connector 7527VCA/D,C,E,B
    and
    the electrical connector 7527VCA/A,L,F, to GND
    ASM 491601.
     (a) If the aircraft wiring is OK:
     (b) If the fault continues:
Subtask 49-00-81-710-147-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:34:34 UTC
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