W DOC AIRBUS | TSM A320F

APU AUTO SHUTDOWN - NO FLAME, Ignition Unit Fault (131-9(A))

TASK 49-00-81-810-825-A
APU AUTO SHUTDOWN - NO FLAME, Ignition Unit Fault (131-9(A))

1. Possible Causes
  • IGNITION UNIT SHOWS OPEN CIRCUIT
  • IGNITION UNIT SHOWS SHORT CIRCUIT
  • damage/contamination of the electrical connector P10
  • wiring
  • IGNITION UNIT (P10)
  • ELECTRONIC CONTROL BOX [59KD]
  • IGNITION UNIT (8030KM)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 49-00-81-810-821-A
APU AUTO SHUTDOWN - NO FLAME, No EGT Rise during Start (131-9(A))
AMM 49-00-00-860-008
APU Start by External Power
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)
ASM 496104
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 49-00-81-710-138-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
    IGNITION UNIT SHOWS OPEN CIRCUIT
    or
    IGNITION UNIT 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 49-00-81-810-101-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
IGNITION EXCITER P10

associated with the Fault Code Number (FCN) 128

  • Do a check for damage/contamination of the electrical connector P10 of the Ignition Unit (P10).
   (1) If the electrical connector P10 is damaged/contaminated:
  • Do a repair/cleaning.
   (2) If the electrical connector P10 is OK:
  • Do a check and repair the wiring from the ECB (59KD) AC/10 to the ignition unit (P10) P10/1 and from the ignition unit (P10) P10/2 to GND ASM 496104.
     (a) If the fault continues:
     (b) If the fault continues:
Subtask 49-00-81-810-104-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 FLAME
IGNITION EXCITER P10

associated with the Fault Code Number (FCN) 146

  • Do a check for damage/contamination of the electrical connector P10 of the Ignition Unit (P10).
   (1) If the electrical connector P10 is damaged/contaminated:
  • Do a repair/cleaning.
   (2) If the electrical connector P10 is OK:
  • Do a check and repair the wiring from the ECB (59KD) AC/10 to the ignition unit (P10) P10/1 and from the ignition unit (P10) P10/2 to GND ASM 496104.
     (a) If the fault continues:
     (b) If the fault continues:
   (3) If the fault continues:
Subtask 49-00-81-810-101-B ** ON A/C NOT FOR ALL
C. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message:

NO FLAME
IGNITION UNIT (8030KM)

associated with the Fault Code Number (FCN) 128

  • Do a check for damage/contamination of the electrical connector P10 of the Ignition Unit (8030KM)
   (1) If the electrical connector P10 is damaged/contaminated:
  • Do a repair/cleaning.
   (2) If the electrical connector P10 is OK:
  • Do a check and repair the wiring from the ECB (59KD) AC/10 to the ignition unit (8030KM) P10/1 and from the ignition unit (8030KM) P10/2 to GND ASM 496104.
     (a) If the fault continues:
     (b) If the fault continues:
Subtask 49-00-81-810-104-B ** ON A/C NOT FOR ALL
D. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message:

NO FLAME
IGNITION UNIT (8030KM)

associated with the Fault Code Number (FCN) 146

  • Do a check for damage/contamination of the electrical connector P10 of the Ignition Unit (8030KM).
   (1) If the electrical connector P10 is damaged/contaminated:
  • Do a repair/cleaning.
   (2) If the electrical connector P10 is OK:
  • Do a check and repair the wiring from the ECB (59KD) AC/10 to the ignition unit (8030KM) P10/1 and from the ignition unit (8030KM) P10/2 to GND ASM 496104.
     (a) If the fault continues:
     (b) If the fault continues:
   (3) If the fault continues:
Subtask 49-00-81-710-139-A ** ON A/C NOT FOR ALL
E. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:34:33 UTC
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