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

TASK 26-21-49-400-804-A
Installation 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.

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

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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 9.5 and 8.5 m.daN (70.06 and 62.68 lbf.ft )
98D27803000000	AR	LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06CMD9)	Silicone Adhesive Sealant-General Purpose One part legacy
(Material No.06LDG2)	Non Hardening Jointing Putty-High Temp. Area - Structure

C. 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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 26-21-00-720-803-A	Check Distribution Piping to Detect Leakage and Obstruction
TASK 26-21-41-000-001-F	Removal of the Engine Fire-Extinguisher Bottle
TASK 26-21-41-400-001-F	Installation 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 28-16-00-400-001-A	Installation of the Fuel Recirculation Pipe
TASK 28-20-00-000-803-A	Removal of the Pylon Engine Fuel-Feed-Pipes
TASK 28-20-00-400-803-A	Installation of the Pylon Engine Fuel-Feed-Pipes
TASK 54-51-21-000-804-A	Removal of the Pylon Lateral Access-Doors
TASK 54-51-21-400-803-A	Installation of the Pylon Lateral Access-Doors
TASK 54-51-61-000-802-A	Removal of the Thermal Blankets between RIB1 and RIB5
TASK 54-51-61-400-802-A	Installation of the Thermal Blankets between RIB1 and RIB5
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Engine Fire-Extinguishing Bottle-Supports
Engine Fire-Extinguishing Pipes (Center Part)
Engine Fire-Extinguishing Pipes (Aft Part)

3. Job Set-up
Subtask 26-21-49-861-053-A

A. Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).

Subtask 26-21-49-860-059-A

B. Safety Precautions
(1) 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) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) 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) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC system 1(2).
(3) On FLAPS panel 114VU:
(a) Make sure that the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION is in position on the flap/slat control lever (Ref. AMM TASK 27-00-00-480-002).
(b) Make sure that the WARNING NOTICE(S) is in position on the flap/slat control lever to tell persons not to operate the flap/slat controls.

Subtask 26-21-49-865-072-A

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

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 26-21-49-010-075-A

D. Get Access
(1) Make sure that the fan cowl doors are open (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 26-21-49-040-058-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) Make sure that the thrust reverser system is deactivated for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 26-21-49-010-076-A

F. Get Access
(1) Make sure that the thrust reverser cowl-doors are open (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) Make sure that an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
(3) Make sure that these access doors are removed (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 26-21-49-010-077-A

G. Removal of the Components
(1) Make sure that the two engine fire-extinguisher bottles are removed (Ref. AMM TASK 26-21-41-000-001).
(2) Make sure that the engine fire-extinguishing bottles-supports are removed.

Engine Fire-Extinguishing Bottle-Supports

(3) If necessary:

Make sure that the pylon engine-fuel feed-pipe and/or the fuel drain line is (are) removed (Ref. AMM TASK 28-20-00-000-803).
Make sure that the fuel recirculation pipe is removed (Ref. AMM TASK 28-16-00-000-001).

(4) Make sure that the thermal blanket is removed (Ref. AMM TASK 54-51-61-000-802).

4. Procedure
Subtask 26-21-49-420-064-A

A. Installation of the Engine Fire-Extinguishing Pipe (Center Part)

Engine Fire-Extinguishing Pipes (Center Part)

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

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

(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Put the pipe (2) in the pylon and in the correct position.
(3) Install the pipe (2) on the pipe (25). Do not torque the nut (24) at this time.
(4) Install the elbow (3) on the interface (23).
(5) Install the clamp (27) with the pipe (2) on the bracket (26).
(6) Install the washer (28) and bolt (29) on the clamp (27).
(7) Tighten the bolt (29).
(8) TORQUE the nut (24) to between 9.5 and 8.5 m.daN (70.06 and 62.68 lbf.ft )

.
(a) Put a red line between the nut (24) and the pipe (25) (Ref. AMM TASK 20-23-22-910-001).

Subtask 26-21-49-420-063-A

B. Installation of the Engine Fire-Extinguisher Pipe (Aft Part)

Engine Fire-Extinguishing Pipes (Aft Part)

(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Clean the mating surface of the elbow (18) (Ref. AMM TASK 20-28-00-912-802).
(3) Put the pipe (1) in the pylon and in the correct position.
(4) Install the pipe (1) on the pipe (2). Do not torque the nut (4) at this time.
(5) Install the three washers (5) and bolts (6). Do not torque the three bolts (6) at this time.
(6) Install the bracket (8):
(a) Install the bracket (8) between the welded bracket (7) and the bracket (11).
(b) Install the two washers (12) and bolts (13). Do not torque the two bolts (13) at this time.
(c) Install the two washers (9) and bolts (10). Do not torque the two bolts (10) at this time.
(7) Apply a layer of Non Hardening Jointing Putty-High Temp. Area - Structure (Material No.06LDG2) on the mating surface of the elbow (18).
(8) Install the pipe (1) on the pipe (22).
(9) Install the three washers (20) and bolts (21). Do not torque the three bolts (21) at this time.
(10) Do an electrical bonding of the elbow (18) (Ref. AMM TASK 20-28-00-912-802).
(11) TORQUE the nut (4) to between 9.5 and 8.5 m.daN (70.06 and 62.68 lbf.ft )

.
(a) Put a red line between the nut (4) and the duct (1) (Ref. AMM TASK 20-23-22-910-001).
(12) TORQUE the nut (19) to between 9.5 and 8.5 m.daN (70.06 and 62.68 lbf.ft )

.
(a) Put a red line between the nut (19) and the duct (22) (Ref. AMM TASK 20-23-22-910-001).
(b) Apply a layer of Silicone Adhesive Sealant-General Purpose One part legacy (Material No.06CMD9) on the edge of surface and the clip nuts of the elbow (18).
(13) Tighten the two bolts (10) and (13).
(a) Put a red line on the two bolts (10) and (13) (Ref. AMM TASK 20-23-22-910-001).
(14) Tighten the three bolts (6).
(a) Put a red line on the bolts (6) (Ref. AMM TASK 20-23-22-910-001).
(b) Apply a layer of Silicone Adhesive Sealant-General Purpose One part legacy (Material No.06CMD9) on the edge of surface and the clip nuts of the elbow (3).
(15) Tighten the three bolts (21).
(a) Put a red line on the bolts (21) (Ref. AMM TASK 20-23-22-910-001).
(16) Install the two clamps (15) on the brackets (14).
(a) Install the four washers (16) and bolts (17) on the two clamps (15).
(b) Tighten the four bolts (17).

Subtask 26-21-49-720-054-A

C. Test
(1) Do a check of the engine fire-extinguishing distribution-piping for leakage and obstruction (Ref. AMM TASK 26-21-00-720-803).

Subtask 26-21-49-410-062-A

D. Installation of the Components
(1) Install the thermal blanket (Ref. AMM TASK 54-51-61-400-802).
(2) If removed:

Install the pylon engine-fuel feed-pipe and/or the fuel drain line (Ref. AMM TASK 28-20-00-400-803).
Install the fuel recirculation pipe (Ref. AMM TASK 28-16-00-400-001).

(3) Installation of the supports-engine fire-extinguishing bottles.

Engine Fire-Extinguishing Bottle-Supports

(a) Install the bracket (34).
1 Install the bracket (34) on the support (35).
2 Install the two bolts (36) and nuts (39) and tighten them.
3 Install the two bolts (37) and nuts (48) and tighten them.
4 Install the clamp (33) with the duct (30) on the bracket (35).
5 Install the two washers (32) and bolts (31) on the clamp (30) and tighten the bolts (31).
(b) Install the bracket (46).
1 Install the bracket (46) on the support (45).
2 Install the three bolts (50) and nuts (47) and tighten them.
3 Install the three bolts (49) and nuts (48) and tighten them.
4 Engage the cable (40) in the two clamps (43).
5 Install the two clamps (43) on the support (44).
6 Install the two washers (42) and bolts (41) and tighten them.
(c) Install the bracket (52).
1 Install the bracket (52) on the support (51).
2 Install the four bolts (54) and nuts (53) and tighten them.
(4) Install the two engine fire-extinguisher bottles (Ref. AMM TASK 26-21-41-400-001).

Subtask 26-21-49-865-071-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	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

5. Close-up
Subtask 26-21-49-410-064-A

A. Close Access
(1) Put the aircraft back to its initial configuration.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the access doors (Ref. AMM TASK 54-51-21-400-803)
(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
(4) Remove the access platform(s).
(5) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 26-21-49-440-054-A

B. Do the reactivation of the thrust reverser system after nacelle maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 26-21-49-410-065-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) On FLAPS panel 114VU:

Remove the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION from the flap/slat control lever.

(3) Remove the WARNING NOTICE(S).

Subtask 26-21-49-862-051-A

D. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.01 07:59:53 UTC