Removal of the Reservoir Pressurization Tubes in the Pylon

TASK 29-14-49-000-802-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	1	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, 415BL, 415BR, 415CR
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 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 54-51-21-000-802-A	Removal of the Pylon Lateral Access-Doors
TASK 54-54-00-000-802-A	Removal of the Rear Pylon Fairing (RPF)
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
Reservoir Pressurization Tubes in the Pylon

3. Job Set-up
Subtask 29-14-49-860-054-A ** ON A/C NOT FOR ALL

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 29-14-49-941-054-A ** ON A/C NOT FOR ALL

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) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
(5) 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.

(6) On the HP ground connectors:

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

Subtask 29-14-49-010-057-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR

Subtask 29-14-49-040-053-A ** ON A/C NOT FOR ALL

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 78-30-00-040-805).

Subtask 29-14-49-010-058-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the thrust-reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the left pylon.
(3) Remove the pylon lateral access-doors that follow (Ref. AMM TASK 54-51-21-000-802):
(a) For the left pylon: 415AL 415BL 415BR 415CR.

Subtask 29-14-49-020-055-A ** ON A/C NOT FOR ALL

F. Remove the rear pylon fairing (Ref. AMM TASK 54-54-00-000-802).

4. Procedure
Subtask 29-14-49-020-054-C ** ON A/C NOT FOR ALL

A. Removal of the Reservoir Pressurization Tubes in the Pylon

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL LOOSEN OR TIGHTEN THE UNION TOO MUCH.

(1) Disconnect the convoluted bleed hose (28) from the tube (2).
(2) Put the PLUG-BLANKING in each disconnected line end.
(3) Remove the bolts (27) and washers (26).
(4) Hold the union of the tube (1) with a WRENCH - STANDARD.
(5) Disconnect the tube (2) from the tube (1).
(6) Remove the bolts (5), washers (4) and clamps (3).
(7) Remove the bolt (23), washer (24) and clamp (25).
(8) Remove the support arm (20).
(a) Remove the bolt (22) and washer (21).
(9) Remove the bolts (15), washers (14) and self-locking nuts (19) from the half-clamp blocks (12) and (13).
(10) Remove the bolts (16) and washers (17).
(11) Remove the two half-clamp blocks (12) and (13).
(12) Remove the tube (2) from the pylon with the related bush (18).
(13) Put the PLUG-BLANKING in each disconnected line end.
(14) Disconnect the tube (1) from the pylon/wing interface.
(15) Retain the spacers (9) and (10).
(16) Remove the bolt (6), washer (7), nut (11) and clamp (8).
(17) Install the bolt (6), washer (7) and nut (11) with the spacers (9) and (10).
(18) Tighten the nut (11).
(19) Remove the tube (1) from the pylon.
(20) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 00:25:06 UTC