Installation of the Pylon Hydraulic Tubes and Hoses [PW11]

TASK 78-31-51-400-803-A
Installation of the Pylon Hydraulic Tubes and Hoses

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

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	Torque wrench: range to between 37.2 and 32.7 lbf.in (0.42 and 0.37 m.daN )
No specific	Torque wrench: range to between 283.2 and 256.7 lbf.in (3.20 and 2.90 m.daN )
No specific	Torque wrench: range to between 522 and 478 lbf.in (5.90 and 5.40 m.daN )
No specific	Torque wrench: range to between 734.6 and 663.8 lbf.in (8.30 and 7.50 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU6-0003)	lubricant

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
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 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-31-00-710-805-A	Operational Test of Thrust Reverser with MCDU
TASK 78-31-00-710-805-A-01	Thrust Reverser Cycling Test (Engine Running)
Pylon Hydraulic Tubes and Hoses
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)

3. Job Set-up
Subtask 78-31-51-941-074-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833)

Subtask 78-31-51-864-059-A ** ON A/C NOT FOR ALL

B. Depressurization of the Hydraulic Systems
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(a) Make sure that the Green hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-001)
(b) Make sure that the Green hydraulic reservoir is depressurized (Ref. AMM TASK 29-14-00-614-001).
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(a) Make sure that the Yellow hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-002)
(b) Make sure that the Yellow hydraulic reservoir is depressurized (Ref. AMM TASK 29-14-00-614-001).

Subtask 78-31-51-010-093-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.

Subtask 78-31-51-040-076-A ** ON A/C NOT FOR ALL

D. Deactivation of the Thrust Reverser System 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 you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

4. Procedure
Subtask 78-31-51-420-068-A ** ON A/C NOT FOR ALL

A. Installation of the Pylon Hoses

CAUTION: HYDRAULIC FLUID CAN CAUSE DAMAGE TO EQUIPMENT. IF HYDRAULIC FLUID FALLS ON A SURFACE, IMMEDIATELY CLEAN THE SURFACE WITH A CLEAN CLOTH.

(1) Removal of the protection covers

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

(a) Remove the CAP - PROTECTION from the pylon deploy hose (1), return hose (3) and stow hose (2).
(2) Lubrication of the threads of the coupling nuts

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

(a) Apply a thin layer of lubricant (Material No.PU6-0003) or equivalent to the threads of the coupling nuts on the deploy hose (1), the return hose (3), and the stow hose (2).
(3) Install the deploy hose (1), the return hose (3) and the stow hose (2) on the Tee-piece. Do not torque the hose fittings at this time.
(4) Install the deploy hose (1), the return hose (3) and the stow hose (2) on the pylon. Do not torque the hose fittings at this time.
(5) Adjust the deploy hose (1), the return hose (3) and the stow hose (2) to keep the pre-load to a minimum.
(6) Tighten the deploy hose (1), the return hose (3) and the stow hose (2) fittings.
(a) TORQUE the deploy hose (1) fittings to between 734.6 and 663.8 lbf.in (8.30 and 7.50 m.daN )

.
(b) TORQUE the return hose (3) fittings to between 283.2 and 256.7 lbf.in (3.20 and 2.90 m.daN )

.
(c) TORQUE the stow hose (2) to between 522 and 478 lbf.in (5.90 and 5.40 m.daN )

.
(7) Install the return hose (3) and the stow hose (2) on the pylon bracket with the screws (4), washers (5) and the two clamps (6) and (7).
(8) TORQUE the screws to between 37.2 and 32.7 lbf.in (0.42 and 0.37 m.daN )

5. Close-up
Subtask 78-31-51-440-068-A ** ON A/C NOT FOR ALL

A. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 78-31-51-863-056-A ** ON A/C NOT FOR ALL

B. Pressurization of the Hydraulic Systems
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(a) Pressurize the reservoir of the Green hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(a) Pressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(3) Make sure that there are no leaks at the tube connections.

Subtask 78-31-51-410-080-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 78-31-51-710-058-A ** ON A/C NOT FOR ALL

D. Test(s)
(1) Do the operational test of the thrust reverser with the MCDU (Ref. AMM TASK 78-31-00-710-805).
(2) Make sure that there is no leakage from the hoses or the connections.

[Rev.10 from 2021] 2026.04.01 03:31:33 UTC