Installation of the APU Fire-Extinguisher Discharge-Outlet and Tubing

TASK 26-22-41-400-803-A
Installation of the APU Fire-Extinguisher Discharge-Outlet and Tubing

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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 4.0 and 3.4 m.daN (29.50 and 25.07 lbf.ft )
No specific	Torque wrench: range to between 7.5 and 6.1 m.daN (55.31 and 44.99 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
314AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
9	PACKING	AIPC 26-22-04-01-016
3	O-RINGS	AIPC 26-22-04-02-050

E. Referenced Information

REFERENCE	DESIGNATION
TASK 26-22-42-400-001-A	Installation of the Fire-Extinguisher Bottle Cartridge
TASK 52-41-23-010-801-A	Opening of Access Door 314AR
TASK 52-41-23-410-801-A	Closing of Access Door 314AR
Extinguisher Discharge-Outlet and Tubing (Meggitt Bottle)
Extinguisher Discharge-Outlet and Tubing (Kidde Bottle)

3. Job Set-up
Subtask 26-22-41-860-059-A

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

Subtask 26-22-41-865-064-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

Subtask 26-22-41-010-060-A

C. Aircraft Maintenance Configuration

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.

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

4. Procedure
Subtask 26-22-41-420-058-A

A. Installation of the APU Fire-Extinguisher Discharge-Outlet (4015WM) and Tubing for Meggitt Assembly

Extinguisher Discharge-Outlet and Tubing (Meggitt Bottle)

.
(7) Safety the swivel nut (8) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(8) Install the fire extinguisher cartridge (Ref. AMM TASK 26-22-42-400-001).

Subtask 26-22-41-420-059-A

B. Installation of the APU Fire-Extinguisher Discharge-Outlet (4015WM) and Tubing for Kidde Assembly

Extinguisher Discharge-Outlet and Tubing (Kidde Bottle)

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Installation of the discharge outlet.
(a) Remove the PLUG-BLANKING from each disconnected line end.
(b) Install the discharge outlet (7) in the fire-extinguisher bottle outlet (9).
(c) Do not fully tighten the discharge outlet (7) at this step.
(5) Installation of the spray tubing.
(a) Install the new AIPC 26-22-04-02-050 O-RINGS (3) and the ring-retainings (2) on the spray tubing (6) and on the discharge outlet (7).
(b) Make sure that the O-ring (3) is correctly installed in the groove of the discharge outlet (7).
(c) Loosely install the bushing (4).
(d) Put the spray tubing (6) in position and loosely install the nuts (1).
(e) Adjust the spray tubing (6) and the discharge outlet (7) to each other.
(f) Install the clamp (5).
(g) Make sure that the spray tubing (6) is aligned with the discharge outlet (7).
(h) Tighten the nuts (1).
(i) Safety the nuts (1) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(6) TORQUE the swivel nut (8) to between 4.0 and 3.4 m.daN (29.50 and 25.07 lbf.ft )

.
(7) Safety the swivel nut (8) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(8) Install the fire extinguisher cartridge (Ref. AMM TASK 26-22-42-400-001).

5. Close-up
Subtask 26-22-41-865-065-A

A. 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/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 26-22-41-410-055-A

B. 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 23:45:40 UTC