W DOC AIRBUS | TSM A320F

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

TASK 49-00-81-810-823-A
APU AUTO SHUTDOWN - NO FLAME, Fuel-Control Unit Fault (131-9(A))

1. Possible Causes
  • FUEL TORQUE MOTOR SHOWS OPEN CIRCUIT
  • FUEL TORQUE MOTOR SHOWS SHORT CIRCUIT
  • FUEL SOLENOID SHOWS CIRCUIT FAILURE
  • damage/contamination of electrical connector P19
  • FUEL CONTROL UNIT (P19)
  • aircraft wiring
  • ELECTRONIC CONTROL BOX [59KD]
  • FUEL CONTROL UNIT (8022KM)
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
MULTIMETER - STANDARD
 B. Referenced Information
REFERENCE
DESIGNATION
AMM 49-00-00-860-008
APU Start by External Power
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))
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 49-00-81-710-134-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
    FUEL TORQUE MOTOR SHOWS OPEN CIRCUIT
    or
    FUEL TORQUE MOTOR SHOWS SHORT CIRCUIT
    or
    FUEL SOLENOID SHOWS CIRCUIT FAILURE
   (4) Start the APU and apply Bleed Air for 20 seconds, minimum AMM 49-00-00-860-008.
4. Fault Isolation
Subtask 49-00-81-810-099-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
FUEL CONTROL UNIT P19

associated with Fault Code Numbers (FCN) 105, 106, 107, 108 or 125

  • do a check for damage/contamination of electrical connector P19 of the FUEL CONTROL UNIT (P19)
   (1) If the electrical connector P19 is damaged/contaminated:
  • do a repair/cleaning.
   (2) If the electrical connector is OK:
  • use a MULTIMETER - STANDARD to do a resistance check across
    pin 6 and pin 7
    pin 8 and pin 9
    of the FUEL CONTROL UNIT (P19).
     (a) If the resistance value is not between 31 Ohms and 41 Ohms (pin 6 - 7)
and/or
not between 18 Ohms and 23 Ohms (pin 8 - 9).
     (b) If the resistance values are in the specified limits:
  • do a check and repair of the aircraft wiring from
    the ECB (59KD) AB/H11,G7,F6 to the FUEL CONTROL UNIT (P19) P19/6,7,8
    and
    the FUEL CONTROL UNIT (P19) P19/9 and GND ASM 496104.
       1 If the fault continues:
Subtask 49-00-81-810-099-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:

NO FLAME
FUEL CONTROL UNIT (8022KM)

associated with Fault Code Numbers (FCN) 105, 106, 107, 108 or 125

  • do a check for damage/contamination of electrical connector P19 of the FUEL CONTROL UNIT (8022KM)
   (1) If the electrical connector P19 is damaged/contaminated:
  • do a repair/cleaning.
   (2) If the electrical connector is OK:
  • use a MULTIMETER - STANDARD to do a resistance check across
    pin 6 and pin 7
    pin 8 and pin 9
    of the FUEL CONTROL UNIT (8022KM)
     (a) If the resistance value is not between 31 Ohms and 41 Ohms (pin 6 - 7)
and/or
not between 18 Ohms and 23 Ohms (pin 8 - 9).
     (b) If the resistance values are in the specified limits:
  • do a check and repair of the aircraft wiring from
    the ECB (59KD) AB/H11,G7,F6 to the FUEL CONTROL UNIT (8022KM) P19/6,7,8
    and
    the FUEL CONTROL UNIT (8022KM) P19/9 and GND ASM 496104.
       1 If the fault continues:
Subtask 49-00-81-710-135-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:34:33 UTC
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