Failure of the Relay 15KS1 Control on the EIU 1

TASK 73-25-00-810-851-A
Failure of the Relay 15KS1 Control on the EIU 1

1. Possible Causes

EIU-1 [1KS1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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 73-25-34-710-041	Read The Class 3 Faults
AMM 73-25-34-710-044	Read the Class 3 Faults

3. Fault Confirmation
Subtask 73-25-00-710-150-A ** ON A/C NOT FOR ALL

A. Test
Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) to read the Class 3 Faults AMM 73-25-34-710-041.

Subtask 73-25-00-710-150-B ** ON A/C NOT FOR ALL

A. Test
Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) to read the Class 3 Faults AMM 73-25-34-710-044.

4. Fault Isolation
Subtask 73-25-00-810-100-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message CHECK 15KS1 RELAY CIRCUIT OR EIU 1:

replace the EIU-1 [1KS1] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.

NOTE: As relay 15KS1 is not installed, no maintenance action in line is necessary. When the message comes into view on the EIU Class 3 report, replace the EIU 1 at the "A" check that follows.

Subtask 73-25-00-710-151-A ** ON A/C NOT FOR ALL

B. If the EIU 1 (1KS1) is replaced:

do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:35:42 UTC