Loss of the Second and Fourth Rows of the Legend of the ENG 2 FIRE Pushbutton Switch and the FIRE Legend of the ENG/2 FIRE/FAULT Annunciator

TASK 26-12-00-810-820-A
Loss of the Second and Fourth Rows of the Legend of the ENG 2 FIRE Pushbutton Switch and the FIRE Legend of the ENG/2 FIRE/FAULT Annunciator

1. Possible Causes

BOARD-ANN LT TEST & INTFC [5LP]
wiring of the annunciator light test and interface board (5LP)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 26-12-00-710-001	Operational Check of Loop/Squib
ASM 261201
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

3. Fault Confirmation
Subtask 26-12-00-710-086-A

A. Test
(1) Do the operational test of the engine fire and overheat detection (loop/squib) AMM 26-12-00-710-001.

4. Fault Isolation
Subtask 26-12-00-810-069-A

A. If during the test, the second and fourth rows of the legend of the ENG 2 FIRE pushbutton switch and the FIRE legend of the ENG/2 FIRE/FAULT annunciator do not come on:

replace the BOARD-ANN LT TEST & INTFC [5LP] AMM 33-14-33-000-001 and AMM 33-14-33-400-001.

(1) If the fault continues:

do a check and repair the wiring of the annunciator light test and interface board (5LP), from pin A/20 to the first terminal block ASM 261201.

Subtask 26-12-00-710-087-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:09 UTC