W DOC AIRBUS | TSM A320F

Loss of the Channel A on the Engine 1

TASK 73-20-00-810-850-A
Loss of the Channel A on the Engine 1

1. Possible Causes
  • ECU [4000KS]
  • harness J1
  • EIU-1 [1KS1]
  • aircraft wiring
  • C/B-ENGINE/1/FADEC A/AND EIU 1 [2KS1]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
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 732505
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 73-29-00-710-040
Operational Test of the FADEC on the ground (with Engine Motoring)
3. Fault Confirmation
Subtask 73-20-00-865-063-A ** ON A/C NOT FOR ALL
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUENGINE/1/FADEC A/AND EIU 12KS1A04
Subtask 73-20-00-710-116-A ** ON A/C NOT FOR ALL
B. Test
   (1) If the circuit breaker (2KS1) is open, refer to Para. 4.A.(2).
   (2) Do the operational test of the FADEC 1A and 1B on the ground (with engine motoring) AMM 73-29-00-710-040.
4. Fault Isolation
Subtask 73-20-00-810-100-B ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message ECU, EIU 28V, J1:
  • do a check of the status of the circuit breaker (2KS1).
   (1) If the circuit breaker is closed:
  • disconnect the connector J1 from the ECU (4000KS) and do a check for 28VDC at pin J1/13 with the FADEC GND PWR pushbutton switch released (the ON legend is on).
     (a) If there is 28VDC:
     (b) If there is no 28VDC:
  • do a check for 28VDC at EIU 1 (1KS1) pin AC/11 ASM 732505.
       1 If there is 28VDC:
  • do a check for open or short to ground at the harness J1 between the EIU 1 (1KS1) and the ECU (4000KS), pin AC/7 to pin J1/13. Replace the harness J1 if necessary.
         a If the fault continues:
  • make sure that there is no ground signal at EIU 1 (1KS1) pin AA/5B ASM 732508.
         b If the fault continues:
       2 If there is no 28VDC:
  • do a check for open or short to ground at the aircraft wiring between the circuit breaker (2KS1) and EIU 1 (1KS1) pin AC/11.
         a If there is a short to ground:
  • repair the above wiring.
         b If there is no short to ground:
  • replace the C/B-ENGINE/1/FADEC A/AND EIU 1 [2KS1] .
       3 Make sure that 28VDC supplies the ESS bus ASM 732505.
   (2) If the circuit breaker (2KS1) is open:
  • close the circuit breaker.
     (a) If the circuit breaker trips:
     (b) If the fault continues:
  • do a check for a short to ground at the harness J1 between the EIU 1 (1KS1) and the ECU (4000KS), pin AC/7 to pin J1/13.
       1 If there is a short to ground:
  • replace the harness J1 .
       2 If there is no short to ground:
  • do a check for a short to ground at the aircraft wiring between EIU 1 (1KS1) pin AC/11 and the circuit breaker (2KS1).
         a If there is a short to ground:
  • repair the above wiring.
         b If there is no short to ground:
  • replace the C/B-ENGINE/1/FADEC A/AND EIU 1 [2KS1] .
       3 Make sure that 28VDC supplies the ESS bus ASM 732505.
Subtask 73-20-00-710-117-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.B.
[Rev.8 from Aug 2018] 2026.04.04 04:35:19 UTC
"WTRUIB" 2025