The DISCH Legend of the ENG 1/AGENT 2 Pushbutton Switch Stays on

TASK 26-21-00-810-816-A
The DISCH Legend of the ENG 1/AGENT 2 Pushbutton Switch Stays on

1. Possible Causes

BOTTLE 2-FIRE EXTING, ENG 1 [8WE1]
ENG/APU FIRE PNL [1WD]
ground signal at the pin A/3 of the engine 1 fire extinguishing bottle 2
wiring of the HP discrete signal from the engine 1 fire extinguishing bottle 2 to the ENG/APU FIRE panel

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 26-12-12-000-001	Removal of the ENG/APU Fire Panel
AMM 26-12-12-400-001	Installation of the ENG/APU Fire Panel
ASM 262101
AMM 26-21-41-000-001	Removal of the Engine Fire-Extinguisher Bottle
AMM 26-21-41-400-001	Installation of the Engine Fire-Extinguisher Bottle

3. Fault Confirmation
Subtask 26-21-00-710-079-A

A. Test
Not applicable, the fault is evident.

4. Fault Isolation
Subtask 26-21-00-810-065-A

A. If the DISCH legend of the ENG 1/AGENT 2 pushbutton switch does not go off:

disconnect the electrical connector 8WE1-A from the engine 1 fire extinguishing bottle 2
do a check for continuity between the pins A/2 and A/3 of the engine 1 fire extinguishing bottle 2.

(1) If there is no continuity:

replace the BOTTLE 2-FIRE EXTING, ENG 1 [8WE1] AMM 26-21-41-000-001 and AMM 26-21-41-400-001.

(2) If there is continuity:

connect the electrical connector 8WE1-A on the engine 1 fire extinguishing bottle 2
replace the ENG/APU FIRE PNL [1WD] AMM 26-12-12-000-001 and AMM 26-12-12-400-001.

(a) If the fault continues:

do a check for a ground signal at the pin A/3 of the engine 1 fire extinguishing bottle 2 ASM 262101.

1 If there is no ground signal:

2 If there is a ground signal:

do a check and repair the wiring of the HP discrete signal from the engine 1 fire extinguishing bottle 2 to the ENG/APU FIRE panel, from pin A/2 to pin B/K ASM 262101.

[Rev.8 from Aug 2018] 2026.04.04 04:27:24 UTC