Failure of the ENG 1/MODE Selector Switch

TASK 76-12-00-810-807-A
Failure of the ENG 1/MODE Selector Switch

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 732508
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 76-12-00-710-062-A ** ON A/C NOT FOR ALL

A. Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) AMM 73-25-34-710-040.

Subtask 76-12-00-710-062-B ** ON A/C NOT FOR ALL

A. Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) AMM 73-25-34-710-043.

4. Fault Isolation
Subtask 76-12-00-810-056-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message 115VU CRANK/MODE AUTO/IGN SEL SW:

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring from the EIU 1 (1KS1) to the ENG panel (115VU) pins AA/1C, 1A, 1B to pins 22, 23, 24 ASM 732508.

Subtask 76-12-00-710-063-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:37:27 UTC