DOC AIRBUS | TSM A320FLoss of N1 Indication on Engine 1 or 2
TASK 77-00-00-810-835-A
Loss of N1 Indication on Engine 1 or 2
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 77-00-00-710-111-A ** ON A/C NOT FOR ALL
Subtask 77-00-00-810-092-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:37:31 UTC
Loss of N1 Indication on Engine 1 or 2
1. Possible Causes
- DMC-1 [1WT1]
- aircraft wiring
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 31-63-34-000-001 | Removal of the DMC |
| AMM 31-63-34-400-001 | Installation of the DMC |
| AMM 71-00-00-710-006 | Minimum Idle Check |
Subtask 77-00-00-710-111-A ** ON A/C NOT FOR ALL
A. Test
(1) Do a check to see if the N1 indication is XX on the upper ECAM display unit with the DMC3 switched on.
4. Fault Isolation(1) Do a check to see if the N1 indication is XX on the upper ECAM display unit with the DMC3 switched on.
Subtask 77-00-00-810-092-A ** ON A/C NOT FOR ALL
A. If N1 indication is not XX on the upper ECAM display unit with the DMC3 switched on:
(1) Replace the DMC-1 [1WT1] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.
Subtask 77-00-00-810-093-A ** ON A/C NOT FOR ALL (1) Replace the DMC-1 [1WT1] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.
B. If N1 indication is XX on the upper ECAM display unit with the DMC3 switched on:
(1) Do a check and repair the aircraft wiring between the N1 sensor (4000EV), the ECU (4000KS) and the DMC (1WT1).
Subtask 77-00-00-710-112-A ** ON A/C NOT FOR ALL (1) Do a check and repair the aircraft wiring between the N1 sensor (4000EV), the ECU (4000KS) and the DMC (1WT1).