DOC AIRBUS | TSM A320FLoss of the Channels A and B of the FADEC on Engine 1
TASK 77-00-00-810-882-A
Loss of the Channels A and B of the FADEC on Engine 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 77-00-00-710-197-A ** ON A/C NOT FOR ALL
Subtask 77-00-00-865-061-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:37:35 UTC
Loss of the Channels A and B of the FADEC on Engine 1
1. Possible Causes
- ECU [4000KS]
- harnesses J1 and J2
- EIU-1 [1KS1]
- aircraft wirings
- C/B-ENGINE/1/FADEC A/AND EIU 1 [2KS1]
- C/B-ENGINE/ENG1/FADEC B/AND EIU 1 [4KS1]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 71-00-00-710-006 | Minimum Idle Check |
| 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) |
Subtask 77-00-00-710-197-A ** ON A/C NOT FOR ALL
A. Test
(1) 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(1) Do the operational test of the FADEC 1A and 1B on the ground (with engine motoring) AMM 73-29-00-710-040.
Subtask 77-00-00-865-061-A ** ON A/C NOT FOR ALL
A. Table of the circuit breakers used in this procedure:
Subtask 77-00-00-810-152-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | ENGINE/1/FADEC A/AND EIU 1 | 2KS1 | A04 |
| 121VU | ENGINE/ENG1/FADEC B/AND EIU 1 | 4KS1 | R41 |
B. If the fault symptom is identified by the upper ECAM warning ENG1 FADEC FAULT and the test of the FADEC 1A and 1B gives no manitenance message:
(d) Check the wiring 568 on the pin 3B at 1KS1:
Subtask 77-00-00-710-198-A ** ON A/C NOT FOR ALL - disconnect the connectors J1 and J2 from the ECU (4000KS) and do a check for 28VDC at pins J1 and J2 /13 with the FADEC GND PWR pushbutton switch released (the ON legend is on).
- replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
- do a check for 28VDC at EIU 1 (1KS1) pins AC/9, 11 ASM 732505.
- do a check for open or short to ground at the harnesses J1 and J2 between the EIU 1 (1KS1) and the ECU (4000KS), pin AC/7 to pin J1/13 and pin AC/2 to pin J2/13. Replace the harness J1 or J2 if necessary.
- make sure that there is no ground signal at EIU 1 (1KS1) pin AA/5B ASM 732508.
- replace the EIU-1 [1KS1] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
- do a check for open or short to ground at the aircraft wirings between the circuit breakers (2KS1), (4KS1) and EIU 1 (1KS1) pin AC/9, 11.
- repair the defective wiring(s).
- replace the defective C/B-ENGINE/1/FADEC A/AND EIU 1 [2KS1] or the C/B-ENGINE/ENG1/FADEC B/AND EIU 1 [4KS1] .
(d) Check the wiring 568 on the pin 3B at 1KS1:
- Repair the above wiring.