DOC AIRBUS | TSM A320FLoss of the GMT Data on the ARINC Bus from the EIU to the FADEC on Engine 1
TASK 73-25-00-810-928-A
Loss of the GMT Data on the ARINC Bus from the EIU to the FADEC on Engine 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-303-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-810-180-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:35:49 UTC
Loss of the GMT Data on the ARINC Bus from the EIU to the FADEC on Engine 1
1. Possible Causes
harness J3 from the EIU (1KS1) to the ECU (4000KS) wiring from CFDIU (1TW) to the EIU-1 (1KS1) - EIU-1 [1KS1]
- CFDIU [1TW]
- ECU [4000KS]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 31-32-34-000-001 | Removal of the CFDIU |
| AMM 31-32-34-400-001 | Installation of the CFDIU |
| 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 732506 | |
| 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 73-25-00-710-303-A ** ON A/C NOT FOR ALL
A. Do the operational test of the FADEC 1B on the ground (with engine non motoring) AMM 73-29-00-710-040.
4. Fault IsolationSubtask 73-25-00-810-180-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message EIU (GMT), J3:
Subtask 73-25-00-810-180-B ** ON A/C NOT FOR ALL - Do a check for open or short to ground at pins AB/5A, 5C to pins J3/22, 23 of the
harness J3 from the EIU (1KS1) to the ECU (4000KS) and at pins AA/11F, 11G to pins AA/11C, 12B of thewiring from CFDIU (1TW) to the EIU-1 (1KS1) ASM 732506.
- Repair the defective harness J3 or the wiring.
- Replace the EIU-1 [1KS1] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
- Replace the CFDIU [1TW] AMM 31-32-34-000-001 and AMM 31-32-34-400-001.
- Replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
A. If the test gives the maintenance message CFDIU, EIU (GMT), J3*:
Subtask 73-25-00-710-304-A ** ON A/C NOT FOR ALL - Do a check for open or short to ground at pins AB/5A, 5C to pins J3/22, 23 of the
harness J3 from the EIU (1KS1) to the ECU (4000KS) and at pins AA/11F, 11G to pins AA/11C, 12B of thewiring from CFDIU (1TW) to the EIU-1 (1KS1) ASM 732506.
- Repair the defective harness J3 or the wiring.
- Replace the EIU-1 [1KS1] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
- Replace the CFDIU [1TW] AMM 31-32-34-000-001 and AMM 31-32-34-400-001.
- Replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
B. Do the test given in Para. 3.A.