Loss of Data on the ARINC Bus from the EIU to the FADEC on Engine 1

TASK 73-25-00-810-936-A
Loss of Data on the ARINC Bus from the EIU to the FADEC on Engine 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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 73-25-34-000-040	Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-040	Installation of the Engine Interface Unit (EIU)

3. Fault Confirmation
Subtask 73-25-00-710-327-A ** ON A/C NOT FOR ALL

A. Test
(1) Not applicable.

4. Fault Isolation
Subtask 73-25-00-810-192-A ** ON A/C NOT FOR ALL

A. Replace the EIU-1 [1KS1] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
(1) If the fault continues:

Subtask 73-25-00-810-192-B ** ON A/C NOT FOR ALL

A. Replace the EIU-1 [1KS1] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
(1) If the fault continues:

Subtask 73-25-00-710-328-A ** ON A/C NOT FOR ALL

B. No additional maintenance action is required if the fault is not confirmed.
(1) Repeat the fault isolation procedure if the fault continues.

[Rev.8 from Aug 2018] 2026.04.04 04:35:49 UTC