Installation of the Hydraulic Pressure Line from the Pylon to the Yellow Hydraulic Pump

TASK 29-13-49-400-808-A
Installation of the Hydraulic Pressure Line from the Pylon to the Yellow Hydraulic Pump

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

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

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)
No specific	1	TAPE - ADHESIVE
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - STANDARD
No specific	Torque wrench: range to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )
No specific	Torque wrench: range to between 4.58 and 4.29 m.daN (33.78 and 31.64 lbf.ft )
No specific	Torque wrench: range to between 9.50 and 8.50 m.daN (70.06 and 62.68 lbf.ft )
No specific	Torque wrench: range to between 10.70 and 9.70 m.daN (78.91 and 71.53 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2442)	engine oil

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB, 198CB
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-13-00-710-002-A	Operational Test of the Yellow Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
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
Hydraulic Pressure Line from the Pylon to the Yellow Hydraulic Pump

3. Job Set-up
Subtask 29-13-49-860-134-A

A. Aircraft Maintenance Configuration
(1) Make sure that the Yellow hydraulic system is depressurized.
(Ref. AMM TASK 29-10-00-864-002).
(2) Depressurize the reservoir of the Yellow hydraulic system.
(Ref. AMM TASK 29-14-00-614-001).

Subtask 29-13-49-941-119-A

B. Safety Precautions
(1) On AIR COND panel 30VU:

Make sure that the APU BLEED pushbutton switch is released (the ON legend is off).
Make sure that a WARNING NOTICE(S) is in position to tell persons not to operate this pushbutton switch.

(2) Make sure that a WARNING NOTICE(S) is in position to tell persons not to pressurize the Yellow hydraulic system:

On the HYD section of panel 40VU
On access door 198CB, on the ground service panel of the Yellow hydraulic system.

(3) Make sure that a WARNING NOTICE(S) is in position on access door 195BB to tell persons not to pressurize the reservoir of the Yellow hydraulic system.
(4) 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.
Make sure that a WARNING NOTICE(S) is in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.

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

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

Subtask 29-13-49-010-130-A

C. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Make sure that an ACCESS PLATFORM 2M (6 FT) is in position at the engine.

4. Procedure
Subtask 29-13-49-420-114-B

A. Installation of the Hydraulic Pressure Line from the Pylon to the Yellow Hydraulic Pump

WARNING: USE PROTECTIVE CLOTHING WHEN YOU USE HYDRAULIC FLUID. HYDRAULIC FLUID CAN CAUSE SKIN IRRITATION.

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.

CAUTION: DO NOT LET HYDRAULIC FLUID FALL ON THE ENGINE. UNWANTED HYDRAULIC FLUID MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH. THE FLUID CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the hydraulic line end-fittings are serviceable.
(4) Remove all protective covers and caps from the openings, tubes, hoses and connectors.
(5) Lubricate the threads of the bolts (4), (5) and (8) with engine oil (Material No.CP2442) .
(6) Put the hydraulic line (2) in position on the engine.
(7) Connect the hydraulic line (2) to the pylon connector (3) as follows:
(a) Adjust the routing of the hydraulic line (2) near the pylon connector (3).
(b) Make that sure the routing of the hydraulic line (2) goes aft of the middle hinge of the fan cowl door.
(c) Make sure that the middle hinge of the fan cowl door does not hit the hydraulic line when the fan cowl door closes.
(d) Attach the hydraulic line (2) to the pylon connector (3).
(8) Adjust the angle of the hydraulic pressure line (2) as follows:
(a) Find the hydraulic suction line immediately aft of the hydraulic pressure line (2).
(b) Measure 8 in. (203.20 mm) down from the quick disconnect at the top of the hydraulic suction line.
(c) Apply a piece of TAPE - ADHESIVE to the hydraulic suction line at the measured location.
(d) Measure the space between the hydraulic suction line and the hydraulic pressure line (2) at the location of the tape.
(e) Adjust the angle of the hydraulic pressure line (2) at the pylon connection (3) until the space is 0.795 -0.005 in. or +0.005 in. (20.2 -0.1 mm or +0.1 mm).
(9) Attach the hydraulic line (2) to the engine at three locations as follows:
(a) Loosely install the bolts (4), (5) and (8) and the clamps (14), (6) and (7) to attach the hydraulic line (2) to the three support brackets (13), (11) and (9).
(b) TORQUE the bolts (4), (5) and (8) to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )

.
(10) Connect the hydraulic line (2) to the pressure transducer (10) as follows:
(a) Manually connect the fitting on the hydraulic line (2) to the pressure transducer (10).
(b) Use a WRENCH - STANDARD to hold the fitting on the pressure transducer (10).
(c) TORQUE the tube nut on the hydraulic line (2) to between 4.58 and 4.29 m.daN (33.78 and 31.64 lbf.ft )

.
(11) Connect the hydraulic pressure tube (2) to the hydraulic pump (1) as follows:
(a) Connect the tube nut on the hydraulic pressure tube (2) to the hydraulic pump (1).
(b) TORQUE the tube nut to between 9.50 and 8.50 m.daN (70.06 and 62.68 lbf.ft )

.
1 Use the triple torque procedure as follows:
a Torque to the specified value.
b Loosen the nut by one turn.
c Torque to the specified value.
d Torque to the specified value again.
(12) TORQUE the tube nut on the hydraulic line (2) at the pylon connector
(3) to between 10.70 and 9.70 m.daN (78.91 and 71.53 lbf.ft )

.
(13) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

Subtask 29-13-49-820-050-A

B. Check of the Fan Cowl Door
(1) Slowly and carefully try to close the fan cowl door. During the travel, examine the clearance between the middle hinge of the fan cowl door and the hydraulic line (2).
(2) If there is not sufficient clearance between the middle hinge and the hydraulic line (2), open the fan cowl door immediately. Loosen the pylon connection and adjust the routing to get the necessary clearance.
(3) Refer to paragraph 4.A.(8) and do a check of the space between the suction line and the pressure line.
(4) Remove the piece of tape from the suction line.

Subtask 29-13-49-710-085-A

C. Operational Test
(1) Do the operational test of the Yellow hydraulic system (Ref. AMM TASK 29-13-00-710-002).
(2) After the dry-motoring, make sure that there were no leaks from the hydraulic connections.
(3) Make sure that the level of the hydraulic fluid in the Yellow reservoir is correct. If necessary, fill the reservoir (Ref. AMM TASK 12-12-29-611-001).

5. Close-up
Subtask 29-13-49-410-114-A

A. Close Access
(1) Remove the container.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the WARNING NOTICE(S).

Subtask 29-13-49-860-136-A

B. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Close access doors 198CB and 195BB.
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 00:23:11 UTC