Installation of the Fire-Extinguisher Bottle Cartridge

TASK 26-22-42-400-001-A
Installation of the Fire-Extinguisher Bottle Cartridge

WARNING: THE CARTRIDGE IS AN EXPLOSIVE DEVICE. REMOVE IT BEFORE YOU DISASSEMBLE THE FIRE EXTINGUISHER BOTTLE. TO PREVENT INJURY TO THE PERSONNEL BECAUSE OF THE EXPLOSION OF THE CARTRIDGE IF IT HAS NOT BEEN FIRED:

INSTALL A SHUNT DEVICE.
THIS WILL SHUNT THE PINS TOGETHER ON THE CARTRIDGE BEFORE ITS REMOVAL.

DO NOT USE A FOIL SHUNT.

FIN: 12WF

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	1	BAG - ELECTROSTATIC SAFETY
No specific	1	FLASHLIGHT
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.1 and 0.9 m.daN (97.35 and 79.65 lbf.in )
No specific	Torque wrench: range to between 1.1 and 1.0 m.daN (97.35 and 88.50 lbf.in )
6971-0010	1	CAP SHUNT-FIRE BOTTLE
MS25043-10DA	1	CARTRIDGE CAP

B. Consumable Materials

REFERENCE	DESIGNATION
No specific	corrosion-resistant steel lockwire 0.8 mm (0.032 in.) dia

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
314AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
7	O-RING	AIPC 26-22-04-01-018
7	O-RING	AIPC 26-22-84-01-050

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 26-22-00-710-001-A	Operational Test of the APU Fire-Extinguishing Loop/Squib
TASK 52-41-23-010-801-A	Opening of Access Door 314AR
TASK 52-41-23-410-801-A	Closing of Access Door 314AR
Fire - Extinguisher Bottle Cartridge ** ON A/C NOT FOR ALL
Fire - Extinguisher Bottle Cartridge ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 26-22-42-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that the WARNING NOTICE(S) is in position on panel 25VU to tell the persons not to operate the APU.

WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

(2) Put on and attach a safety harness before you start work in the work area
(3) Make sure that the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE is in position below maintenance door 314AR.
(4) Make sure that access door 314AR is open and safetied in the open position.
(Ref. AMM TASK 52-41-23-010-801).
(5) If necessary, use a FLASHLIGHT.

Subtask 26-22-42-865-052-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/FIRE AND OVHT/DET/LOOP B	2WG	L44
121VU	APU/FIRE AND OVHT/DET/LOOP A	1WG	L43
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
121VU	APU/FIRE/EXTIG/SQUIB/B	2WF	L39
121VU	APU/FIRE/EXTIG/SQUIB/A	1WF	L38
121VU	APU/FIRE/LP VALVE/NORM	4WF	M42
121VU	APU/FIRE/LP VALVE/STBY	3WF	M41

4. Procedure

WARNING: MAKE SURE THAT THE MAXIMUM PERMITTED LIFE (MPL) OF THE CARTRIDGE IS LONGER THAN THE TIME TO THE NEXT SCHEDULED DISCARD OF THE CARTRIDGE.

Subtask 26-22-42-210-051-A ** ON A/C NOT FOR ALL

A. Preparation for Installation

WARNING: BEFORE YOU TOUCH THE POWER DEVICE CARTRIDGE, MAKE SURE THAT YOU ARE GROUNDED AND THAT YOU INSTALL A SHUNT DEVICE ON IT. USE A CAP OR PLUG AS SHUNT DEVICE (THE CAP OR PLUG WILL SHUNT THE PINS TOGETHER ON THE CARTRIDGE). DO NOT USE A FOIL SHUNT. IF YOU TOUCH A POWER DEVICE CARTRIDGE THAT DOES NOT HAVE A SHUNT DEVICE INSTALLED, AN EXPLOSION CAN OCCUR AND CAUSE INJURIES TO YOU.

(1) Make sure that the MS25043-10DA CARTRIDGE CAP is installed on the cartridge (2).
(2) Make sure that the cartridge is in a BAG - ELECTROSTATIC SAFETY.
(3) Clean the component interfaces and the adjacent area.
(4) Do an inspection of the component interfaces and the adjacent area.

Subtask 26-22-42-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the Fire-Extinguisher Bottle Cartridge (12WF)

WARNING: DO NOT INSTALL THE CARTRIDGE ON THE DISCHARGE HEAD IF THE HEAD IS NOT INSTALLED ON THE FIRE EXTINGUISHER BOTTLE.

(1) Install the bonding lug (3) on the cartridge (2).
(2) Install the new AIPC 26-22-04-01-018 O-RING (7) or AIPC 26-22-84-01-050 O-RING (7) on the cartridge (2).
(3) Install the cartridge (2) in the Fire-Extinguisher Bottle (8).
(4) TORQUE the cartridge (2) to between 1.1 and 1.0 m.daN (97.35 and 88.50 lbf.in )

.
(5) Safety the cartridge (2) with corrosion-resistant steel lockwire 0.8 mm (0.032 in.) dia.
(6) Install the washer (4), the bonding strap (5) and the nut (6) on the bonding lug (3) (Ref. AMM TASK 20-28-00-912-802).
(7) Remove the MS25043-10DA CARTRIDGE CAP from the cartridge (2).
(8) Remove the CAP-BLANKING from each electrical connector and receptacle.
(9) Make sure that all the electrical connections are clean and in the correct condition.
(10) Connect the electrical connector (1) to the cartridge (2).

Subtask 26-22-42-210-051-B ** ON A/C NOT FOR ALL

C. Preparation for Installation

(1) Make sure that the 6971-0010 CAP SHUNT-FIRE BOTTLE or CAP SHUNT-FIRE BOTTLE (CEC-10) is installed on the cartridge (2).
(2) Make sure that the cartridge is in a BAG - ELECTROSTATIC SAFETY.
(3) Clean the component interfaces and the adjacent area.
(4) Do an inspection of the component interfaces and the adjacent area.

Subtask 26-22-42-420-050-B ** ON A/C NOT FOR ALL

D. Installation of the Fire-Extinguisher Bottle Cartridge (12WF)
(1) Install the bonding lug (3) on the cartridge (2).
(2) Install the cartridge (2) in the Fire-Extinguisher Bottle (7).
(3) TORQUE the cartridge (2) to between 1.1 and 0.9 m.daN (97.35 and 79.65 lbf.in )

.
(4) Safety the cartridge (2) with corrosion-resistant steel lockwire 0.8 mm (0.032 in.) dia.
(5) Install the washer (4), the bonding strap (5) and the nut (6) on the bonding lug (3) (Ref. AMM TASK 20-28-00-912-802).
(6) Remove the 6971-0010 CAP SHUNT-FIRE BOTTLE or CAP SHUNT-FIRE BOTTLE (CEC-10) from the cartridge (2).
(7) Remove the CAP-BLANKING from each electrical connector and receptacle.
(8) Make sure that all the electrical connections are clean and in the correct condition.
(9) Connect the electrical connector (1) to the cartridge (2).

Subtask 26-22-42-865-053-A

E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/FIRE AND OVHT/DET/LOOP B	2WG	L44
121VU	APU/FIRE AND OVHT/DET/LOOP A	1WG	L43
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
121VU	APU/FIRE/EXTIG/SQUIB/B	2WF	L39
121VU	APU/FIRE/EXTIG/SQUIB/A	1WF	L38
121VU	APU/FIRE/LP VALVE/NORM	4WF	M42
121VU	APU/FIRE/LP VALVE/STBY	3WF	M41

Subtask 26-22-42-710-051-A

F. Do the operational test of the APU Fire-Extinguishing Loop/Squib (Ref. AMM TASK 26-22-00-710-001).

5. Close-up
Subtask 26-22-42-410-053-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Set the light switch to off.
(3) Close access door 314AR (Ref. AMM TASK 52-41-23-410-801).
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.03.31 23:45:42 UTC