Loss of Data on the Secondary ECS Bus to the EIU 1

TASK 73-25-00-810-877-A
Loss of Data on the Secondary ECS Bus to the EIU 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
AMM 73-25-34-710-043	Operational Test of the Engine Interface Unit

3. Fault Confirmation
Subtask 73-25-00-710-214-A ** ON A/C NOT FOR ALL

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

Subtask 73-25-00-710-214-B ** ON A/C NOT FOR ALL

A. Test
Do the operational test of the engine interface unit through the CFDS AMM 73-25-34-710-043.

4. Fault Isolation
Subtask 73-25-00-810-132-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message EIU 1 : NO ZONE CONT S DATA:

(1) If the fault continues:

do a check and repair the wiring from the EIU-1 (1KS1) pins AA/3J, 3K to the first terminal block ASM 732506.

Subtask 73-25-00-710-215-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.A.

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