Removal of the Hydraulic Pressure Line from the Pylon to the Green Hydraulic Pump

TASK 29-11-49-000-809-A
Removal of the Hydraulic Pressure Line from the Pylon to the Green 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: OBEY THE HYDRAULIC SAFETY PROCEDURES.

ZONE: 435

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	AR	CAP - PROTECTION
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - STANDARD

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
435	FAN AND ACCESSORY GEARBOX
195BB, 197CB
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR

C. Referenced Information

REFERENCE	DESIGNATION
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 71-13-00-010-803-A	Opening of the Fan Cowl Doors
Hydraulic Pressure Line from the Pylon to the Green Hydraulic Pump

3. Job Set-up
Subtask 29-11-49-860-144-A

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

Subtask 29-11-49-941-114-A

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

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

(2) Open access door 197CB.
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system.
(3) On the HYD section of panel 40VU:

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

(4) Open access door 195BB:
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the reservoir of the Green hydraulic system.
(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 the ENG section of maintenance panel 50VU:

Make sure that the ON legend of the 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).

Subtask 29-11-49-010-134-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
(2) Put an ACCESS PLATFORM 2M (6 FT) in position at the engine.

4. Procedure
Subtask 29-11-49-020-127-B

A. Removal of the Hydraulic Pressure Line from the Pylon to the Green 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) Put a CONTAINER 5 L (1.32 USGAL) in position below the hydraulic pump (1).
(2) Disconnect the hydraulic line (2) from the hydraulic pump (1) as follows:
(a) Use a WRENCH - STANDARD to hold the fitting on the hydraulic pump (1).
(b) Use a second WRENCH - STANDARD to disconnect the hydraulic line (2) from the fitting.
(c) Let the hydraulic line (2) drain into the CONTAINER 5 L (1.32 USGAL).
(3) Disconnect the fitting on the hydraulic line (2) at the connection to the pressure transducer (10).
(4) Disconnect the hydraulic line (2) from the engine at three locations as follows:
(a) Remove the bolts (4), (5) and (8) from each of the three clamps (14), (6) and (7).
(b) Remove the three clamps (14), (6) and (7) from the support brackets (13), (11) and (9).
(5) Disconnect the upper fitting on the hydraulic line (2) from the pylon connector (3).
(6) Remove the hydraulic line (2) from the engine.
(7) Install COVER - PROTECTION and CAP - PROTECTION on the all open ports, open tubes, open hoses and disconnected connectors.

[Rev.10 from 2021] 2026.04.01 08:00:40 UTC