DOC AIRBUS | TSM A320FSpurious TCMA Arming on Engine 1
TASK 73-20-00-810-985-A
Spurious TCMA Arming on Engine 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 73-20-00-710-340-A ** ON A/C NOT FOR ALL
Subtask 73-20-00-810-287-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:35:32 UTC
Spurious TCMA Arming on Engine 1
1. Possible Causes
Relay (29KS1) Relay (30KS1) - EIU-1 [1KS1]
- 8LP Board
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 33-14-33-000-001 | Removal of the Annunciator-Light Test and Interface-Board |
| AMM 33-14-33-400-001 | Installation of the Annunciator-Light Test and Interface-Board |
| ASM 732509 | |
| 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) |
Subtask 73-20-00-710-340-A ** ON A/C NOT FOR ALL
A. test
4. Fault Isolation- Check if the "Fault" light located in Engine Control Unit Panel (115VU) is illuminated:
- No further action is required
- Do the step 4. Fault Isolation
Subtask 73-20-00-810-287-A ** ON A/C NOT FOR ALL
A. If amber fault light is illuminated:
Subtask 73-20-00-710-341-A ** ON A/C NOT FOR ALL - On the overhead panel (50VU), push FADEC GND PWR 1 pushbotton switch
- Check if the "Fault" light located in Engine Control Unit Panel (115VU) is illuminated:
- Pull 24KS1 C/B
- Check if the "Fault" light located in Engine Control Unit Panel (115VU) is illuminated:
- Replace
Relay (29KS1) .
- Replace
Relay (30KS1) .
- Pull 2KS1 C/B
- Pull 4KS1 C/B
- Check if the "Fault" light located in Engine Control Unit Panel (115VU) is illuminated:
- Replace EIU-1 [1KS1] AMM 73-25-34-000-040 AMM 73-25-34-400-040.
- Replace 8LP Board AMM 33-14-33-000-001 AMM 33-14-33-400-001.
- repair the wiring between 8LP board and 5KS ASM 732509;
B. Do the test given in Para. 3.A.