W DOC AIRBUS | TSM A320F

Uncommanded engine start/crank on Engine 2

TASK 80-00-00-810-855-A
Uncommanded engine start/crank on Engine 2

1. Possible Causes
  • wiring between the ENG/MASTER CTL switch (2KC) and the EIU-2 (1KS2)
  • wiring between the EIU-2 (1KS2) and the ECU-2 (4000KS2)
  • wiring between the ECU-2 (4000KS2) and the starter shutoff valve
  • wiring between the ENG/MASTER CTL switch (4KC) and the EIU-2 (1KS2)
  • EIU-1 [1KS1]
  • EIU-2 [1KS2]
  • CTL SW-ENG/MASTER 2 [2KC]
  • ENG/MAN START/1 pushbutton switch (9KS2)
  • ECU-1 [4000KS1]
  • starter shutoff valve
  • SEL SW-ENG/MODE/CRANK/AUTO IGN/IGN (6KS)
  • wiring between the EIU-2 (1KS2) and the ECU-1 (4000KS2)
  • CTL SW-ENG/MASTER 1 [3KC]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 31-36-00-740-008
Access to the Parameter Call-Up Menus
AMM 71-00-00-710-003
Engine Automatic Start
AMM 71-00-00-710-028
Engine Shutdown
AMM 73-21-60-000-001
Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001
Installation of the Electronic Control Unit (ECU)
ASM 732506
ASM 732508
AMM 73-25-34-000-040
Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-040
Installation of the Engine Interface Unit (EIU)
AMM 73-25-34-710-040
Operational Test of the Engine Interface Unit
AMM 73-25-34-710-043
Operational Test of the Engine Interface Unit
AMM 73-29-00-710-040
Operational Test of the FADEC on the ground (with Engine Motoring)
ASM 743101
AMM 80-11-20-000-001
Removal of the Starter Shutoff Valve
AMM 80-11-20-400-001
Installation of the Starter Shutoff Valve
3. Fault Confirmation
Subtask 80-00-00-710-184-A ** ON A/C NOT FOR ALL
A. Test
   (1) Not applicable, the fault is evident.
4. Fault Isolation
Subtask 80-00-00-810-187-A ** ON A/C NOT FOR ALL
A. If the flight crew has reported an uncommanded engine start or an uncommanded engine rotation with the ENG/MASTER 1 control switch (3KC) not set in the "ON" position:
WARNING: MAKE SURE THAT ALL ENGINE OPERATING AREAS ARE AS CLEAN AS POSSIBLE. ALL RAMPS, TAXIWAYS, RUNWAYS AND OTHER OPERATING AREAS MUST BE VERY CLEAN TO PREVENT BAD DAMAGE TO THE ENGINE, AIRCRAFT AND PERSONS IN THE AREA.
   (1) Request flight crew report and especially the cockpit configuration:
  • ENG/MASTER 1 control switch (3KC) position,
  • Rotary Selector position,
  • ENG/MAN START/1 pushbutton switch (9KS1) position.
    Identify the action that has led to the engine to automatically start and how the start sequence has been stopped.
   (2) Prepare the MCDU for an alpha call up of the affected engine of ECU label 273 (07C/1/273/01) AMM 31-36-00-740-008.
   (3) Try to reproduce the uncommanded start in the same conditions as reported by the flight crew.
   (4) Note the values of ECU label 273 bit 19, 20, 21 & 22.
   (5) If the engine starts, stop the engine AMM 71-00-00-710-028 and go to Para 4.C.
   (6) If the engine do not start, put the aircraft in normal configuration and go to Para 4.B.
Subtask 80-00-00-810-188-A ** ON A/C NOT FOR ALL
B. If the uncommanded start cannot be reproduced:
   (1) Do the operational test of the engine interface unit through the CFDS AMM 73-25-34-710-040.
  • If there is a fault message, do the related troubleshooting procedure.
   (2) Do the operational test of the FADEC 1A and 1B on the ground (with engine non motoring) AMM 73-29-00-710-040.
  • If there is a fault message, do the related troubleshooting procedure.
   (3) Do a check and repair:
     (a) The wiring between the ENG/MASTER CTL switch (2KC) and the EIU-2 (1KS2) ASM 732508:
  • pin 2A and pin 4E
  • pin 3A and pin 5A.
     (b) The wiring between the EIU-2 (1KS2) and the ECU-2 (4000KS2) ASM 732506:
  • pin 5A and pin 22
  • pin 5C and pin 23
  • pin 15A and pin 22
  • pin 15C and pin 11.
     (c) The wiring between the ECU-2 (4000KS2) and the starter shutoff valve ASM 743101:
  • pin J10/9 and pin C19/3
  • pin J10/10 and pin C19/4
  • pin J10/12 and pin C19/1
  • pin J10/11 and pin C19/2
  • pin J9/9 and pin C14/3
  • pin J9/10 and pin C14/4
  • pin J9/12 and pin C14/1
  • pin J9/11 and pin C14/2.
   (4) Try to reproduce the uncommanded start in the same conditions as reported by the flight crew.
  • If the engine starts, stop the Engine AMM 71-00-00-710-028 and go to Para 4.C.
  • If the engine not starts, put the aircraft in normal configuration and go to Para 4.D.
Subtask 80-00-00-810-189-A ** ON A/C NOT FOR ALL
C. If the uncommanded start can be reproduced:
NOTE: It is important to obey the sequence of the steps to find the defective componant.
   (1) Do the operational test of the engine interface unit through the CFDS AMM 73-25-34-710-040.
  • If there is a fault message, do the related troubleshooting procedure.
   (2) Do the operational test of the FADEC 1A and 1B on the ground (with engine non motoring) AMM 73-29-00-710-040.
  • If there is a fault message, do the related troubleshooting procedure.
   (3) Swap the EIUs (1KS1) and (1KS2) AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
NOTE: The purpose is to check if the fault will follow the EIU.
   (4) Check if the fault has swapped also by trying to reproduce the uncommanded start:
   (5) Do a check and repair:
     (a) The wiring between the ENG/MASTER CTL switch (2KC) and the EIU-2 (1KS2) ASM 732508:
  • pin 2A and pin 4E
  • pin 3A and pin 5A.
     (b) The wiring between the EIU-2 (1KS2) and the ECU-2 (4000KS2) ASM 732506:
  • pin 5A and pin 22
  • pin 5C and pin 23
  • pin 15A and pin 22
  • pin 15C and pin 11.
     (c) The wiring between the ECU-2 (4000KS2) and the starter shutoff valve ASM 743101:
  • pin J10/9 and pin C19/3
  • pin J10/10 and pin C19/4
  • pin J10/12 and pin C19/1
  • pin J10/11 and pin C19/2
  • pin J9/9 and pin C14/3
  • pin J9/10 and pin C14/4
  • pin J9/12 and pin C14/1
  • pin J9/11 and pin C14/2.
   (6) If the fault continues:
     (a) Replace the CTL SW-ENG/MASTER 2 [2KC] on the ENG panel 115VU.
     (b) Try to reproduce the uncommanded start in the same conditions as reported by the flight crew:
  • If the fault continues, stop the engine AMM 71-00-00-710-028 and replace the ENG/MAN START/1 pushbutton switch (9KS2).
  • If the fault does not continues, put the aircraft in normal configuration and go to Para 4.D.
     (c) Try to reproduce the uncommanded start in the same conditions as reported by the flight crew:
     (d) Try to reproduce the uncommanded start in the same conditions as reported by the flight crew:
     (e) Try to reproduce the uncommanded start in the same conditions as reported by the flight crew:
  • If the fault continues, stop the engine AMM 71-00-00-710-028 and replace the SEL SW-ENG/MODE/CRANK/AUTO IGN/IGN (6KS).
  • If the fault does not continues, put the aircraft in normal configuration and go to Para 4.D.
Subtask 80-00-00-810-188-B ** ON A/C NOT FOR ALL
D. If the uncommanded start cannot be reproduced:
   (1) Do the operational test of the engine interface unit through the CFDS AMM 73-25-34-710-043.
  • If there is a fault message, do the related troubleshooting procedure.
   (2) Do the operational test of the FADEC 1A and 1B on the ground (whit engine non motoring) AMM 73-29-00-710-040.
  • If there is a fault message, do the related troubleshooting procedure.
   (3) Do a check and repair:
     (a) The wiring between the ENG/MASTER CTL switch (4KC) and the EIU-2 (1KS2) ASM 732508:
  • pin 2A and pin 4E
  • pin 3A and pin 5A.
     (b) The wiring between the EIU-2 (1KS2) and the ECU-2 (4000KS2) ASM 732506:
  • pin 5A and pin 22
  • pin 5C and pin 23
  • pin 15A and pin 22
  • pin 15C and pin 11.
     (c) The wiring between the ECU-2 (4000KS2) and the starter shutoff valve ASM 743101:
  • pin J10/9 and pin C19/3
  • pin J10/10 and pin C19/4
  • pin J10/12 and pin C19/1
  • pin J10/11 and pin C19/2
  • pin J9/9 and pin C14/3
  • pin J9/10 and pin C14/4
  • pin J9/12 and pin C14/1
  • pin J9/11 and pin C14/2.
   (4) Try to reproduce the uncommanded start in the same conditions as reported by the flight crew.
  • If the engine starts, stop the Engine AMM 71-00-00-710-028 and go to Para 4.C.
  • If the engine not starts, put the aircraft in normal configuration and go to Para 4.D.
Subtask 80-00-00-810-189-B ** ON A/C NOT FOR ALL
E. If the uncommanded start can be reproduced:
NOTE: It is important to obey the sequence of the steps to find the defective componant.
   (1) Do the operational test of the engine interface unit through the CFDS AMM 73-25-34-710-043.
  • If there is a fault message, do the related troubleshooting procedure.
   (2) Do the operational test of the FADEC 1A and 1B on the ground (with engine non motoring) AMM 73-29-00-710-040.
  • If there is a fault message, do the related troubleshooting procedure.
   (3) Swap the EIUs (1KS1) and (1KS2) AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
NOTE: The purpose is to check if the fault will follow the EIU.
   (4) Check if the fault has swapped also by trying to reproduce the uncommanded start:
   (5) Do a check and repair:
     (a) The wiring between the ENG/MASTER CTL switch (2KC) and the EIU-2 (1KS2) ASM 732508:
  • pin 2A and pin 4E
  • pin 3A and pin 5A.
     (b) The wiring between the EIU-2 (1KS2) and the ECU-1 (4000KS2) ASM 732506:
  • pin 5A and pin 22
  • pin 5C and pin 23
  • pin 15A and pin 22
  • pin 15C and pin 11.
     (c) The wiring between the ECU-2 (4000KS2) and the starter shutoff valve ASM 743101:
  • pin J10/9 and pin C19/3
  • pin J10/10 and pin C19/4
  • pin J10/12 and pin C19/1
  • pin J10/11 and pin C19/2
  • pin J9/9 and pin C14/3
  • pin J9/10 and pin C14/4
  • pin J9/12 and pin C14/1
  • pin J9/11 and pin C14/2.
   (6) If the fault continues:
     (a) Replace the CTL SW-ENG/MASTER 1 [3KC] on the ENG panel 115VU.
     (b) Try to reproduce the uncommanded start in the same conditions as reported by the flight crew:
  • If the fault continues, stop the engine AMM 71-00-00-710-028 and replace the ENG/MAN START/1 pushbutton switch (9KS2).
  • If the fault does not continues, put the aircraft in normal configuration and go to Para 4.D.
     (c) Try to reproduce the uncommanded start in the same conditions as reported by the flight crew:
     (d) Try to reproduce the uncommanded start in the same conditions as reported by the flight crew:
     (e) Try to reproduce the uncommanded start in the same conditions as reported by the flight crew:
  • If the fault continues, stop the engine AMM 71-00-00-710-028 and replace the SEL SW-ENG/MODE/CRANK/AUTO IGN/IGN (6KS).
  • If the fault does not continues, put the aircraft in normal configuration and go to Para 4.D.
Subtask 80-00-00-810-190-A ** ON A/C NOT FOR ALL
F. Do an engine automatic start procedure AMM 71-00-00-710-003 and check the correct behaviour.
Subtask 80-00-00-810-191-A ** ON A/C NOT FOR ALL
G. Report the event to Airbus Engineering Support and report the values noted during the alpha call up.
[Rev.8 from Aug 2018] 2026.04.04 04:38:38 UTC
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