The SQUIB and DISCH Legends of the ENG 1/AGENT 2 Pushbutton Switch do not Come on

TASK 26-21-00-810-808-A
The SQUIB and DISCH Legends of the ENG 1/AGENT 2 Pushbutton Switch do not Come on

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 2045110
AMM 26-12-00-710-001	Operational Check of Loop/Squib
ASM 262101

3. Fault Confirmation
Subtask 26-21-00-865-055-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 26-21-00-710-064-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 26-21-00-810-057-A

A. If the SQUIB and DISCH legends of the ENG 1/AGENT 2 pushbutton switch do not come on during the fire test:

on the panel 25VU, set the ANN LT switch to TEST and do a check to see if the SQUIB and DISCH legends come on.

(1) If the SQUIB and DISCH legends do not come on:
(a) Replace the lamps of the ENG 1/AGENT 2 pushbutton switch.

(b) Or replace the ENG 1/AGENT 2 pushbutton switch that has LEDs ESPM 2045110.
(c) If the fault continues:

do a check and repair the wiring of the 5VAC signal at the ENG 1/AGENT 2 pushbutton switch from the ENG/APU FIRE panel (1WD) pin B/C to the first terminal block ASM 262101.

(2) If the SQUIB and DISCH legends come on:

do a check and repair the wiring of the ground signal at the ENG 1/AGENT 2 pushbutton switch on the ENG/APU FIRE panel pin B/D ASM 262101 .

Subtask 26-21-00-710-065-A

B. Do the test given in Para. 3.

5. Close-up
Subtask 26-21-00-860-055-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 04:27:23 UTC