DOC AIRBUS | TSM A320FFailure of the N1 Speed Condition Relay for Engine 1
TASK 73-25-00-810-859-A
Failure of the N1 Speed Condition Relay for Engine 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-166-A ** ON A/C NOT FOR ALL Subtask 73-25-00-710-166-B ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 73-25-00-810-108-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:35:43 UTC
Failure of the N1 Speed Condition Relay for Engine 1
1. Possible Causes
RELAY-N1 SPEED CONDTN (2708GJ) - EIU-1 [1KS1]
wiring from the EIU-1 (1KS1) to the relay (2708GJ)
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| ASM 291202 | |
| 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 73-25-34-710-040 | Operational Test of the Engine Interface Unit |
| AMM 73-25-34-710-043 | Operational Test of the Engine Interface Unit |
Subtask 73-25-00-710-166-A ** ON A/C NOT FOR ALL Subtask 73-25-00-710-166-B ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 73-25-00-810-108-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message CHECK 2708GJ RELAY CIRCUIT OR EIU 1:
Subtask 73-25-00-710-167-A ** ON A/C NOT FOR ALL - replace the
RELAY-N1 SPEED CONDTN (2708GJ) ASM 291202.
- replace the EIU-1 [1KS1] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
- do a check and repair the
wiring from the EIU-1 (1KS1) to the relay (2708GJ) pin AB/9E to pin Z.
B. Do the test given in Para. 3.A.