Failure of the T/R Inhibition System on Engine 1

TASK 73-25-00-810-869-A
Failure of the T/R Inhibition System on Engine 1

1. Possible Causes

RELAY-THRUST REV INHIBITION, ENG 1 [14KS1]
EIU-1 [1KS1]
wiring from the EIU-1 (1KS1) to the engine 1 thrust reverser inhibition relay (14KS1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 732516
ASM 732519
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 73-25-00-710-198-A ** ON A/C NOT FOR ALL

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

Subtask 73-25-00-710-198-B ** ON A/C NOT FOR ALL

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

4. Fault Isolation
Subtask 73-25-00-810-124-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message CHECK 14KS1 RELAY CIRCUIT OR EIU 1:

replace the RELAY-THRUST REV INHIBITION, ENG 1 [14KS1] ASM 732516 and ASM 732519.

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring from the EIU-1 (1KS1) to the engine 1 thrust reverser inhibition relay (14KS1) pin AB/10A to pin x of the relay (14KS1) ASM 732516 and ASM 732516.

Subtask 73-25-00-710-199-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