DOC AIRBUS | TSM A320FLow N1 on Engine 1
TASK 73-00-00-810-863-A
Low N1 on Engine 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 73-00-00-710-172-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 73-00-00-810-112-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:35:10 UTC
Low N1 on Engine 1
1. Possible Causes
- ECU [4000KS]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 70-00-00-810-801-A | Engine Failure(s) |
| 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) |
| AMM 73-29-00-710-040 | Operational Test of the FADEC on the ground (with Engine Motoring) |
Subtask 73-00-00-710-172-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 73-00-00-810-112-A ** ON A/C NOT FOR ALL
A. If the check confirms the fault:
(1) Do a check of the PS3 and PS12 sense lines to make sure that there are no leaks.
(2) Do an operational test of the FADEC on the ground (with engine motoring) to do a check of the VSV/VBV position AMM 73-29-00-710-040.
(3) Replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
(4) Do the trouble shooting procedure (Ref. TSM TASK 70-00-00-810-801).
Subtask 73-00-00-710-173-A ** ON A/C NOT FOR ALL (1) Do a check of the PS3 and PS12 sense lines to make sure that there are no leaks.
(2) Do an operational test of the FADEC on the ground (with engine motoring) to do a check of the VSV/VBV position AMM 73-29-00-710-040.
(3) Replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
(4) Do the trouble shooting procedure (Ref. TSM TASK 70-00-00-810-801).
B. Do the test given in Para. 3.A.