Removal of the Cartridge of the Cargo Fire-Extinguisher Bottle

TASK 26-23-42-000-004-A
Removal of the Cartridge of the Cargo Fire-Extinguisher Bottle

WARNING: DO NOT REMOVE/INSTALL THE DISCHARGE HEAD WITH THE CARTRIDGE INSTALLED.

ZONE: 150
ZONE: 160
ZONE: 170
FIN: 4016WX ** ON A/C NOT FOR ALL
FIN: 4018WX ** ON A/C NOT FOR ALL
FIN: 4021WX ** ON A/C NOT FOR ALL
FIN: 4023WX ** ON A/C NOT FOR ALL

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

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	ELECTRICALLY GROUNDED WRIST STRAP
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
10-101950-81	AR	SHUNT PLUG-FIRE EXTINGUISHER CARTRIDGE,HTL

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
160	BULK CARGO COMPARTMENT AFT BULKHEAD OF AFT CARGO COMPARTMENT TO AFT BULKHEAD OF BULK CARGO COMPARTMENT
170	AFT CAB U/FLOOR COMPT AFT BHD OF BULK
826
161DW
162AW

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 25-55-12-000-001-A	Removal of the Aft Cargo-Compartment Partition at FR65
TASK 25-55-12-000-003-A	Removal of the Sidewall Panels in the Aft Cargo Compartment - FR59/FR65
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 26-23-00-00	CARGO COMPARTMENT FIRE EXTINGUISHING - DESCRIPTION AND OPERATION
Cartridge - Cargo Fire-Extinguisher Bottle

3. Job Set-up
Subtask 26-23-42-861-052-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the ground service network (Ref. AMM TASK 24-42-00-861-001).

Subtask 26-23-42-865-056-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR COND/CARGO FIRE/EXTIG/BTL2	8WX	C04
49VU	AIR COND/CARGO FIRE/EXTIG/BTL1	1WX	C03
** ON A/C NOT FOR ALL
122VU	AIR COND/CARGO/FIRE/EXTIG	1WX	T19

Subtask 26-23-42-010-054-A ** ON A/C NOT FOR ALL

C. Get Access
(1) For the location of this component, refer to Para. Component Location (Ref. AMM D/O 26-23-00-00).
(2) Open the aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-001).
(3) Set the CARGO COMPT LIGHT switch 8LU to the ON position.
(4) Remove the sidewall panel 162AW (Ref. AMM TASK 25-55-12-000-003).

Subtask 26-23-42-010-054-B ** ON A/C NOT FOR ALL

C. Get Access
(1) For the location of this component, refer to Para. Component Location (Ref. AMM D/O 26-23-00-00).
(2) Open the aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-001).
(3) Set the CARGO COMPT LIGHT switch 8LU to the ON position.
(4) Remove the partition panel 161DW (Ref. AMM TASK 25-55-12-000-001).

4. Procedure
Subtask 26-23-42-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Cartridges

Cartridge - Cargo Fire-Extinguisher Bottle ** ON A/C NOT FOR ALL

NOTE: The removal procedure is the same for cartridges 4016WX, 4018WX, 4021WX and 4023WX.

(1) Make sure that you are grounded with the ELECTRICALLY GROUNDED WRIST STRAP.
(2) Disconnect the electrical connector (5) as follows:

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(a) If the lockwire is installed, remove and discard it from the electrical connector (5).

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.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(b) Disconnect the electrical connector (5) from the cartridge (4).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Put the 10-101950-81 SHUNT PLUG-FIRE EXTINGUISHER CARTRIDGE,HTL on the cartridge (4).

(3) Remove and discard the lockwire from the cartridge (4).
(4) Remove the cartridge (4) as follows:

WARNING: DO NOT TOUCH THE FRANGIBLE DISC IN THE FIRE EXTINGUISHER BOTTLE. DAMAGE TO THE FRANGIBLE DISC CAN CAUSE UNWANTED DISCHARGE AND INJURY TO PERSONS.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR(S) IS(ARE) DISCONNECTED BEFORE YOU DISCONNECT THE BONDING STRAP(S).

(a) Remove the nut (6) and the bonding strap (3) from the ground lug bolt (7).
(b) Remove the cartridge (4).
(c) Remove the ground lug bolt (7).
(d) Remove and discard the O-ring (2).
(e) Put the PLUG - BLANKING on the discharge head (1).

[Rev.10 from 2021] 2026.03.31 23:46:41 UTC