Failure of the Annunciator Light Test and Interface Board for Engine 1

TASK 73-25-00-810-857-A
Failure of the Annunciator Light Test and Interface Board for Engine 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 33-14-33-000-001	Removal of the Annunciator-Light Test and Interface-Board
AMM 33-14-33-400-001	Installation of the Annunciator-Light Test and Interface-Board
ASM 732509
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 73-25-00-710-162-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 73-25-00-710-162-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 73-25-00-810-106-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message CHECK 8LP RELAY CIRCUIT OR EIU 1:

replace the BOARD-ANN LT TEST & INTFC [8LP] AMM 33-14-33-000-001 and AMM 33-14-33-400-001

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring from the EIU-1 (1KS1) to the board (8LP) pin AB/9A to pin AA/21 ASM 732509.

Subtask 73-25-00-710-163-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:35:43 UTC