Removal of the Reservoir Pressurization Tubes in the Pylon

TASK 29-14-49-000-803-A
Removal of the Reservoir Pressurization Tubes in the Pylon

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: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.

WARNING: DO NOT TOUCH THE HYDRAULIC SYSTEM COMPONENTS FOR A SHORT TIME AFTER THE ENGINE IS SHUTDOWN. THE ENGINE COMPONENTS STAY HOT FOR SOME TIME AND CAN CAUSE INJURY.

ZONE: 410
ZONE: 470

1. Reason for the Job
This procedure is applicable only for the left pylon.
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	WARNING NOTICE(S)
No specific	AR	WRENCH - STANDARD
98D27803000000	1	LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
410	ENG 1 PYLON BOX AND FORWARD FAIRING
470	ENGINE 1 AFT PYLON
195BB, 197CB, 197EB, 198CB, 415AL, 415AR, 415BL, 415BR, 415CR, 475AL
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
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 54-54-00-000-804-A	Removal of the Rear Pylon Fairing (RPF)
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 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Reservoir Pressurization Tubes in the Pylon

3. Job Set-up
Subtask 29-14-49-860-056-A

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft hydraulic systems are depressurized (Ref. AMM TASK 29-10-00-864-001) (Ref. AMM TASK 29-10-00-864-002) (Ref. AMM TASK 29-10-00-864-003).
(2) Depressurize the hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-001).
(3) Open access doors 197CB, 197EB and 198CB:
(a) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green, Blue and Yellow hydraulic systems:

On the ground service panel of the Green hydraulic system
On the ground service panel of the Blue hydraulic system
On the ground service panel of the Yellow hydraulic system.

(4) Open access door 195BB:
(a) Put WARNING NOTICE(S) in position to tell persons not to pressurize the hydraulic reservoirs.

Subtask 29-14-49-941-056-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 AIR COND panel 30VU:

Make sure that the APU BLEED pushbutton switch is released (ON legend off).
Make sure that the ENG 1(2) BLEED pushbutton switch is released (OFF legend on).
Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.

(3) On the HYD section of panel 40VU:

Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green, Blue and Yellow hydraulic systems.

(4) On the ENG section of maintenance panel 50VU:

Make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton switch is off.
Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

(5) On the center pedestal, on ENG panel 115VU:

Make sure that the ENG/MODE selector switch is in the NORM position.
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.
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.

(6) On FLAPS panel 114VU:

Put the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION in position on the flap/slat control lever.
Put a WARNING NOTICE(S) in position on the flap/slat control lever to tell persons not to operate the flap/slat controls.

(7) On the HP ground connectors:

Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.

Subtask 29-14-49-010-061-A

C. 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

Subtask 29-14-49-040-055-A

D. 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 maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 29-14-49-010-062-A

E. 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

Subtask 29-14-49-020-057-A

F. Removal of the Components
(1) Remove the rear pylon fairing (Ref. AMM TASK 54-54-00-000-804):
(a) For the left pylon: 475AL.
(2) Disconnection of the Convoluted Bleed Hose

Reservoir Pressurization Tubes in the Pylon

(a) Disconnect the convoluted bleed hose (23) from the tube (2).
(b) Remove the nut (24), washer (25) and bolt (26).
(c) Put the PLUG-BLANKING in each disconnected line end.
(d) Remove the thermal blankets (Ref. AMM TASK 54-51-61-000-802).
(e) Remove the bolts (22) and washers (21) from the tube (2).

Subtask 29-14-49-010-065-A

G. Close Access
(1) Close the thrust-reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR

Subtask 29-14-49-410-058-A

H. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the left pylon.
(2) Remove the pylon lateral access-doors that follow (Ref. AMM TASK 54-51-21-000-804):
(a) For the left pylon: 415AL 415BL 415AR 415BR 415CR.

4. Procedure
Subtask 29-14-49-020-060-A

A. Removal of the Reservoir Pressurization Tubes in the Pylon

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

(1) Removal of the tube (1)
(a) At rib (8), hold the union of the tube (1) with a WRENCH - STANDARD and disconnect the tube (2) from the tube (1).
(b) Remove the bolts (5), washers (4) and clamps (3) from the tube (1).
(c) Remove the bolt (20), nut (17), washer (19) and clamp (18).
(d) At the pylon/wing interface, hold the wing union with a WRENCH - STANDARD and disconnect the tube (1).
(e) Remove the tube (1) from the pylon.
(f) Put the PLUG-BLANKING in each disconnected line end.
(2) Removal of the tube (2)
(a) Remove the bolts (5), washers (4) and clamps (3) from the tube (2).
(b) Remove the bolts (11), washers (10) and self-locking nuts (6) from the half-clamp blocks (7) and (9).
(c) Remove the bolts (14) and washers (15).
(d) Remove the two half-clamp blocks (7) and (9) and the closing clamp block (13).
(e) Remove the tube (2) from the pylon with the related bush (12).
(f) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 00:25:09 UTC