DOC AIRBUS | TSM A320FLoss of the A/THR Control on Engine 1
TASK 73-25-00-810-889-A
Loss of the A/THR Control on Engine 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-226-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-810-140-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:35:46 UTC
Loss of the A/THR Control on Engine 1
1. Possible Causes
harness J3 between the EIU (1KS1) and the ECU (4000KS) - EIU-1 [1KS1]
wiring between the FCU (2CA) and the EIU (1KS1) - FCU [2CA]
- FMGC-1 [1CA1]
- ECU [4000KS]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 22-81-12-000-001 | Removal of the FCU |
| AMM 22-81-12-400-001 | Installation of the FCU |
| AMM 22-83-34-000-001 | Removal of the FMGC |
| AMM 22-83-34-400-001 | Installation of the FMGC |
| 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 732510 | |
| 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) |
Subtask 73-25-00-710-226-A ** ON A/C NOT FOR ALL
A. Test
Do the operational test of the FADEC 1A on the ground (with engine non motoring) AMM 73-29-00-710-040.
4. Fault IsolationDo the operational test of the FADEC 1A on the ground (with engine non motoring) AMM 73-29-00-710-040.
Subtask 73-25-00-810-140-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message EIU (ATN 1), J3:
Subtask 73-25-00-810-140-B ** ON A/C NOT FOR ALL - do a check for open or short to ground at the
harness J3 between the EIU (1KS1) and the ECU (4000KS) pins AB/5A, 5C to pins J3/22, 23 ASM 732506 and ASM 732510.
- replace the EIU-1 [1KS1] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
- do a check of the
wiring between the FCU (2CA) and the EIU (1KS1) pins AA/DD, EE to pins AA/1J, 1K.
- repair the above wiring.
- replace the FCU [2CA] AMM 22-81-12-000-001 and AMM 22-81-12-400-001.
- replace the FMGC-1 [1CA1] AMM 22-83-34-000-001 and AMM 22-83-34-400-001.
- replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
A. If the test gives the maintenance message FCU, EIU (ATN1), J3:
Subtask 73-25-00-710-227-A ** ON A/C NOT FOR ALL - do a check for open or short to ground at the
harness J3 between the EIU (1KS1) and the ECU (4000KS) pins AB/5A, 5C to pins J3/22, 23 ASM 732506 and ASM 732510.
- replace the EIU-1 [1KS1] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
- do a check of the
wiring between the FCU (2CA) and the EIU (1KS1) pins AA/DD, EE to pins AA/1J, 1K.
- repair the above wiring.
- replace the FCU [2CA] AMM 22-81-12-000-001 and AMM 22-81-12-400-001.
- replace the FMGC-1 [1CA1] AMM 22-83-34-000-001 and AMM 22-83-34-400-001.
- replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
B. Do the test given in Para. 3.A.