Installation of the Engine Fire-Extinguisher Bottle

TASK 26-21-41-400-001-A
Installation of the Engine Fire-Extinguisher Bottle

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.

WARNING: BE VERY CAREFUL WHEN YOU MOVE A FULL FIRE EXTINGUISHER BOTTLE. A SUDDEN OR HEAVY SHOCK TO A FULL BOTTLE CAN CAUSE UNWANTED DISCHARGE AND INJURY TO PERSONS.

WARNING: IF YOU REMOVE THE FIRE EXTINGUISHER BOTTLES IN A CLOSED HANGAR, MAKE SURE THAT THERE IS A FLOW OF NEW AIR IN THE HANGAR.

CAUTION: BEFORE INSTALLATION, MAKE SURE THAT:

THE EXTINGUISHER BOTTLE, DISCHARGE HEAD AND CARTRIDGE ARE FROM THE SAME VENDOR, AND
THE PART NUMBERS ARE THE ONES SPECIFIED IN THE IPC.

ZONE: 415
ZONE: 425
FIN: 6WE1 ** ON A/C NOT FOR ALL
FIN: 6WE2 ** ON A/C NOT FOR ALL
FIN: 8WE1 ** ON A/C NOT FOR ALL
FIN: 8WE2 ** 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	WARNING NOTICE(S)
263193	AR	SHUNT PLUG-FIRE EXTINGUISHER CARTRIDGE
53100141-1	AR	PLUG, SHUNT
OR	OR
M83723-60-18AN	AR	CAP, PROTECTIVE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
415	LOWER PYLON
425	LOWER PYLON
FOR [6WE1] (BOTTLE 1-FIRE EXTING, ENG 1)
FOR [8WE1] (BOTTLE 2-FIRE EXTING, ENG 1)
415BL, 415BR
FOR [6WE2] (BOTTLE 1-FIRE EXTING, ENG 2)
FOR [8WE2] (BOTTLE 2-FIRE EXTING, ENG 2)
425BL, 425BR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 20-15-00-910-001-A	Handling Precautions for Electrostatic Discharge Sensitive Devices
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 20-28-00-912-803-A	Bonding Surface Preparation
TASK 26-12-00-710-001-A	Operational Check of Loop/Squib
TASK 26-21-00-710-002-A	Operational Check of Engine-Bottle Low-Pressure Indicating-Circuit
TASK 26-21-41-280-001-A	Weight Check of the Engine Fire-Extinguisher Bottle
TASK 26-21-41-400-002-A	Installation of the Discharge Head of the Engine Fire-Extinguisher Bottle
TASK 26-21-41-400-004-A	Installation of the Cartridge of the Engine Fire-Extinguisher Bottle
TASK 54-51-21-000-001-A	Removal of the Pylon Lateral Access-Doors
Engine Fire-Extinguisher Bottle ** ON A/C NOT FOR ALL
Retaining Ring and O-ring ** ON A/C NOT FOR ALL
Retaining Ring and O-ring ** ON A/C NOT FOR ALL
Engine Fire-Extinguisher Bottle ** ON A/C NOT FOR ALL
Retaining Ring and O-ring ** ON A/C NOT FOR ALL
FOR [6WE1] (BOTTLE 1-FIRE EXTING, ENG 1)
FOR [8WE1] (BOTTLE 2-FIRE EXTING, ENG 1)
TASK 54-51-21-400-001-A	Installation of the Pylon Lateral Access-Doors
FOR [6WE2] (BOTTLE 1-FIRE EXTING, ENG 2)
FOR [8WE2] (BOTTLE 2-FIRE EXTING, ENG 2)
TASK 54-51-21-400-001-A	Installation of the Pylon Lateral Access-Doors

3. Job Set-up
Subtask 26-21-41-860-051-B ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration

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

Retaining Ring and O-ring ** ON A/C NOT FOR ALL

(1) On the center pedestal, on the ENG panel 115VU:
(a) Make sure that the ENG/MODE/CRANK/NORM/IGN/START selector switch is in the NORM position.
(b) Make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the 53100141-1 PLUG, SHUNTM83723-60-18AN CAP, PROTECTIVE is installed on the cartridge (9). Make sure that the line (4) is turned to the left.
(4) Make sure that the O-ring (20) is in position and not damaged.
(5) Make sure that the retaining ring (19) is in the correct position in the groove of the nut (6) and not damaged.

Subtask 26-21-41-860-051-C ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration

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

Retaining Ring and O-ring ** ON A/C NOT FOR ALL

(1) On the center pedestal, on the ENG panel 115VU:
(a) Make sure that the ENG/MODE/CRANK/NORM/IGN/START selector switch is in the NORM position.
(b) Make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the 263193 SHUNT PLUG-FIRE EXTINGUISHER CARTRIDGE is installed on the cartridge (9).
(4) Make sure that the line (4) is turned to the left.
(5) Make sure that the O-ring (20) is in position and not damaged.
(6) Make sure that the retaining ring (19) is in the correct position in the groove of the nut (6) and not damaged.

Subtask 26-21-41-280-052-A ** ON A/C NOT FOR ALL

B. Weight Check
(1) Do a weight check of the engine fire-extinguisher bottle (Ref. AMM TASK 26-21-41-280-001).

NOTE: If the engine fire-extinguisher bottle was weighed in a short time before this installation it is not necessary to weigh it again.

Subtask 26-21-41-420-062-A ** ON A/C NOT FOR ALL

C. Installation of the Equipment
(1) Install the discharge head (Ref. AMM TASK 26-21-41-400-002).
(2) Install the cartridge (Ref. AMM TASK 26-21-41-400-004).

Subtask 26-21-41-875-055-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 6WE2 (BOTTLE 1FIRE EXTING, ENG 2) FOR FIN: 6WE1 (BOTTLE 1FIRE EXTING, ENG 1)
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q43
FOR FIN: 8WE2 (BOTTLE 2FIRE EXTING, ENG 2) FOR FIN: 8WE1 (BOTTLE 2FIRE EXTING, ENG 1)
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE2	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q41

Subtask 26-21-41-010-054-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position below the pylon
(2) Make sure that the access door 415BL, 415BR, 425BL, 425BR are removed (Ref. AMM TASK 54-51-21-000-001).

4. Procedure
Subtask 26-21-41-420-050-B ** ON A/C NOT FOR ALL

A. Installation of the Fire-Extinguisher Bottle

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.

(1) Remove the blanking plug from the line (4).
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Clean the component interfaces and the adjacent area.
(4) Install the bottle (12):

WARNING: BE VERY CAREFUL WHEN YOU MOVE A FULL FIRE EXTINGUISHER BOTTLE. A SUDDEN OR HEAVY SHOCK TO A FULL BOTTLE CAN CAUSE UNWANTED DISCHARGE AND INJURY TO PERSONS.

(a) Install the bonding lead (14):
1 Put the fire extinguisher bottle (12) with the discharge head/cartridge assembly installed on it in the pylon.
2 Turn the bottle (12) to install the bonding lead (14), the washer (16) and the nut (15) on the screw (17) on the discharge head (10).
(b) Put the fire extinguisher bottle (12) on its support and push the discharge head (10) into the line (4).
(5) Tighten the nut (6) on the union (5) by hand as follows:

while you hold the nut pin outside its housing, tighten the nut (6) until it stops,
loosen the nut (a quarter of a turn maximum) until the pin engages its housing.

(6) Make sure that the clearance J1 between the nut (6) and the union (5) has a maximum value of 4.3 mm (0.17 in.).
(7) Install the washers (3), the screws (2) and tighten them.

Subtask 26-21-41-081-050-B ** ON A/C NOT FOR ALL

B. Removal of the Safety Tool

WARNING: DO NOT TOUCH THE CARTRIDGE BEFORE YOU DO THE PROCEDURE APPLICABLE TO DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE THE FIRE EXTINGUISHER BOTTLE TO RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS.

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) Before you touch the cartridge, do the procedure for devices that are sensitive to electrostatic discharge (Ref. AMM TASK 20-15-00-910-001).
(2) Remove the 53100141-1 PLUG, SHUNTM83723-60-18AN CAP, PROTECTIVE from the cartridge (9).

Subtask 26-21-41-420-050-C ** ON A/C NOT FOR ALL

C. Installation of the Engine Fire-Extinguisher Bottle

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.

(1) Remove the blanking plug from the line (4).
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Clean the component interfaces and the adjacent area.

WARNING: BE VERY CAREFUL WHEN YOU MOVE A FULL FIRE EXTINGUISHER BOTTLE. A SUDDEN OR HEAVY SHOCK TO A FULL BOTTLE CAN CAUSE UNWANTED DISCHARGE AND INJURY TO PERSONS.

(4) Install the engine fire-extinguisher bottle (12) as follows:
(a) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).
(b) Install the bonding lead (16):
1 Put the engine fire-extinguisher bottle (12) in position in the pylon.
2 Make sure that the discharge head/cartridge assembly is installed on the engine fire-extinguisher bottle (12).
3 Turn the engine fire-extinguisher bottle (12) and install the bonding lead (16), washer (17), screw (18) and nut (15) on the discharge head (10).
4 Tighten the nut (15).
(c) Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
(d) Remove the 73245-02 SAFETY CAP from the nut (6) of the discharge head (10).
(e) Put the engine fire-extinguisher bottle (12) on its support and push the discharge head (10) into the line (4).
(5) Tighten the nut (6) on the union (5) with your hand as follows:

While you hold the nut pin on the outer side of its housing, tighten the nut (6) until it stops.
Loosen the nut (a quarter of a turn maximum) until the pin engages into its housing.

(6) Make sure that clearance J1 between the nut (6) and the union (5) has a maximum value of 4.3 mm (0.17 in.).
(7) Install the washers (3) and the screws (2).
(8) Tighten the screws (2).

Subtask 26-21-41-081-050-C ** ON A/C NOT FOR ALL

D. Removal of the Safety Tool

(1) Before you touch the cartridge, do the procedure for devices that are sensitive to electrostatic discharge (Ref. AMM TASK 20-15-00-910-001).
(2) Remove the 263193 SHUNT PLUG-FIRE EXTINGUISHER CARTRIDGE from the cartridge (9).

Subtask 26-21-41-420-058-B ** ON A/C NOT FOR ALL

E. Connect the Electrical Connectors
(1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Connect the electrical connector (1) to the pressure switch (13).
(4) Connect the electrical connector (8) to the cartridge (9).

5. Close-up
Subtask 26-21-41-875-056-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 6WE2 (BOTTLE 1FIRE EXTING, ENG 2) FOR FIN: 6WE1 (BOTTLE 1FIRE EXTING, ENG 1)
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q43
FOR FIN: 8WE2 (BOTTLE 2FIRE EXTING, ENG 2) FOR FIN: 8WE1 (BOTTLE 2FIRE EXTING, ENG 1)
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE2	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q41

Subtask 26-21-41-710-050-A ** ON A/C NOT FOR ALL

B. Do these Test
(1) Do an operational test of the loop/squib (Ref. AMM TASK 26-12-00-710-001).
(2) Do an operational test of the low-pressure indicating circuit (Ref. AMM TASK 26-21-00-710-002).

Subtask 26-21-41-410-050-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) FOR [6WE1] (BOTTLE 1-FIRE EXTING, ENG 1), [8WE1] (BOTTLE 2-FIRE EXTING, ENG 1)

Close the access doors 415BR 415BL (Ref. AMM TASK 54-51-21-400-001).

(3) FOR [6WE2] (BOTTLE 1-FIRE EXTING, ENG 2), [8WE2] (BOTTLE 2-FIRE EXTING, ENG 2)

Close the access doors 425BR 425BL (Ref. AMM TASK 54-51-21-400-001).

(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:44:48 UTC