Loss of Data on ARINC Bus from the CFDIU for Engine 1

TASK 73-25-00-810-881-A
Loss of Data on ARINC Bus from the CFDIU for Engine 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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 73-25-34-710-040	Operational Test of the Engine Interface Unit

3. Fault Confirmation
Subtask 73-25-00-710-186-A ** ON A/C NOT FOR ALL

A. Not applicable.

4. Fault Isolation
Subtask 73-25-00-810-118-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message EIU 1 : NO CFDIU DATA:

(1) If the fault continues:

do a check and repair the wiring from the EIU-1 (1KS1) pins AA/11C, 12B to the first terminal block ASM 732506.

Subtask 73-25-00-710-187-A ** ON A/C NOT FOR ALL

B. Do the operational test of the engine interface unit through the CFDS AMM 73-25-34-710-040.

[Rev.8 from Aug 2018] 2026.04.04 04:35:45 UTC