Removal of the Engine Fire-Extinguishing Pipes (Center and Aft Part)

TASK 26-21-49-000-804-A
Removal of the Engine Fire-Extinguishing Pipes (Center and Aft Part)

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

ZONE: 400

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 2M (6 FT) - ADJUSTABLE
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D27803000000	1	LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
415AL, 415AR, 415BL, 415BR, 415CR, 437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
425AL, 425AR, 425BL, 425BR, 425CR, 447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 26-21-41-000-001-F	Removal of the Engine Fire-Extinguisher Bottle
TASK 27-00-00-480-002-A	Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
TASK 28-16-00-000-001-A	Removal of the Fuel Recirculation Pipe
TASK 28-20-00-000-803-A	Removal of the Pylon Engine Fuel-Feed-Pipes
TASK 54-51-21-000-804-A	Removal of the Pylon Lateral Access-Doors
TASK 54-51-61-000-802-A	Removal of the Thermal Blankets between RIB1 and RIB5
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
Engine Fire-Extinguishing Bottle-Supports
Engine Fire-Extinguishing Pipes (Aft Part)
Engine Fire-Extinguishing Pipes (Center Part)

3. Job Set-up
Subtask 26-21-49-861-052-A

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

Subtask 26-21-49-941-062-A

B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(2) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(3) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC system 1(2).
(4) On FLAPS panel 114VU:
(a) Put the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION in position on the flap/slat control lever (Ref. AMM TASK 27-00-00-480-002).
(b) Put a WARNING NOTICE(S) on the flap/slat control lever to tell persons not to operate the flap/slat controls.

Subtask 26-21-49-865-073-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE2	Q41
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q40

Subtask 26-21-49-010-072-A

D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 26-21-49-040-057-A

E. Deactivation of the Thrust Reverser for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 26-21-49-010-073-A

F. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(3) Remove the access doors (Ref. AMM TASK 54-51-21-000-804):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
415AL 415BL 415AR 415BR 415CR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
425AL 425BL 425AR 425BR 425CR

Subtask 26-21-49-010-074-A

G. Removal of the Components
(1) Remove the two engine fire-extinguisher bottles (Ref. AMM TASK 26-21-41-000-001).
(2) Removal of the engine fire-extinguishing bottle-supports

Engine Fire-Extinguishing Bottle-Supports

(a) Remove the bracket (34).
1 Remove the two bolts (31) and washers (32) from the clamp (33).
2 Disengage the clamp (33) from the bracket (34).
3 Remove the two bolts (36) and nuts (39).
4 Remove the two bolts (37) and nuts (38).
5 Remove the bracket (34) from the support (35).
(b) Remove the bracket (46).
1 Remove the two bolts (41) and washers (42) from the two clamps (43).
2 Disengage the cable (40) from the two clamps (43).
3 Remove the two clamps (43) from the support (44).
4 Remove the three bolts (50) and nuts (47).
5 Remove the three bolts (49) and nuts (48).
6 Remove the bracket (46) from the support (45).
(c) Remove the bracket (52).
1 Remove the four bolts (54) and nuts (53).
2 Remove the bracket (52) from the support (51).
(3) If necessary:

Remove the pylon engine-fuel feed-pipe and/or the fuel drain line (Ref. AMM TASK 28-20-00-000-803).
Remove the fuel recirculation pipe (Ref. AMM TASK 28-16-00-000-001).

(4) Remove the thermal blanket (Ref. AMM TASK 54-51-61-000-802).

4. Procedure
Subtask 26-21-49-020-062-A

A. Removal of the Engine Fire-Extinguishing Pipe (Aft Part)

Engine Fire-Extinguishing Pipes (Aft Part)

(1) Loosen the nut (4).
(2) Remove the three bolts (6) and washers (5).
(3) Remove the two bolts (10) and washers (9) from the two brackets (8) and (11).
(4) Remove the two bolts (13) and washers (12) from the bracket (8) and the welded bracket (7).
(5) Remove the bracket (8).
(6) Disconnect the pipe (1) from the pipe (2).
(7) Loosen the nut (19).
(8) Remove the three bolts (21) and washers (20).
(9) Disconnect the pipe (1) from the pipe (22).
(10) Remove the four bolts (17) and washers (16) from the two clamps (15).
(11) Remove the two clamps (15) from the two brackets (14) and the pipe (1).
(12) Remove the pipe (1) from the pylon.
(13) Put the PLUG-BLANKING in each disconnected line end.

Subtask 26-21-49-020-063-A

B. Removal of the Engine Fire-Extinguishing Pipe (Center Part)

Engine Fire-Extinguishing Pipes (Center Part)

NOTE: You must remove the aft part of the engine fire-extinguishing pipe before you remove the center part of the engine fire-extinguishing pipe.

NOTE: Use a second wrench to hold the union when you disconnect/connect the two pipes.

(1) Loosen the nut (24).
(2) Remove the bolt (29) and washer (28) from the clamp (27).
(3) Remove the clamp (27) from the bracket (26) and the pipe (2).
(4) Disconnect the pipe (2) from the pipe (25).
(5) Disengage the elbow (3) from the interface (23).
(6) Remove the pipe (2) from the pylon.
(7) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 07:59:50 UTC