Loss of the FIRE Legend of ENG/1 FIRE/FAULT Annunciator

TASK 26-12-00-810-817-A
Loss of the FIRE Legend of ENG/1 FIRE/FAULT Annunciator

1. Possible Causes

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 26-12-00-865-054-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	LIGHTING/TST/BOARD/SPLY	30LP	X06

Subtask 26-12-00-710-080-A

B. 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 26-12-00-810-066-A

A. If during the test, the FIRE legend of the ENG/1 FIRE/FAULT annunciator does not come on:

on the panel 25VU, set the ANN LT switch to TEST and do a check to see if the FIRE legend of the ENG/1 FIRE/FAULT annunciator comes on.

(1) If it comes on:

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

(a) If the fault continues:

do a check and repair the wiring of the annunciator light test and interface board (5LP), from pin A/38 to the first terminal block and from pin A/39 to pin A/32 ASM 261201.

(b) If it does not come on:

1 If the fault continues:

do a check and repair the wiring of the ENG/1 FIRE/FAULT annunciator (5KS1), from pin A/9 to the first terminal block and from pin A/7 to the pin A/37 of the annunciator light test and interface board (5LP) ASM 261201.

Subtask 26-12-00-710-081-A

B. Do the test given in Para. 3.

5. Close-up
Subtask 26-12-00-860-054-A

A. Put the aircraft back to its initial configuration.
(1) On the panel 25VU, set the ANN LT switch to BRT.

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