Removal of the Hydraulic Case Drain Line from the Pylon to the Yellow Hydraulic Pump

TASK 29-13-49-000-809-A
Removal of the Hydraulic Case Drain 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: OBEY THE HYDRAULIC SAFETY PROCEDURES.

ZONE: 445

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	2	WRENCH - STANDARD

B. Work Zones and Access Panels

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

C. Referenced Information

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

3. Job Set-up
Subtask 29-13-49-860-132-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 29-13-49-941-117-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 198CB.
(a) Put WARNING NOTICE(S) in position on the ground service panel to tell persons not to pressurize the Yellow hydraulic system.
(3) On the HYD section of panel 40VU:

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

(4) Put a WARNING NOTICE(S) in position on access door 195BB to tell persons not to pressurize the reservoir of the Yellow 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 29-13-49-010-126-A

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

4. Procedure

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.

Subtask 29-13-49-020-123-A

A. Removal of the Hydraulic Case Drain Line from the Pylon to the Yellow Hydraulic Pump
(1) Put the CONTAINER 5 L (1.32 USGAL) in position below the hydraulic pump (1).
(2) Disconnect the hydraulic tube (1) from the hydraulic pump (2) as follows:
(a) Use the WRENCH - STANDARD to hold the drain fitting (18) on the hydraulic pump (2).
(b) Use the second WRENCH - STANDARD to disconnect the hydraulic tube (1) from the drain fitting (18).
(c) Let the hydraulic line (1) drain into the CONTAINER 5 L (1.32 USGAL).
(3) Disconnect the hydraulic tube (1) from the filter (4) as follows:
(a) Use the WRENCH - STANDARD to hold the fitting on the filter (4).
(b) Use the second WRENCH - STANDARD to disconnect the hydraulic tube (1) from the fitting.
(c) Remove the hydraulic tube (1) from the engine.
(4) Disconnect the hydraulic tube (3) from the filter (4) as follows:
(a) Use the WRENCH - STANDARD to hold the fitting on the filter (4).
(b) Use the second WRENCH - STANDARD to disconnect the hydraulic tube (3) from the fitting.
(5) Disconnect the hydraulic tube (3) from the left side of the engine at four locations as follows:
(a) Remove the bolts (5), (8), (15) and (16) from each of the four clamps (6), (7), (11) and (13).
(b) Remove the four clamps (6), (7), (11) and (13) from the support brackets (9), (10), (12) and (14).
(6) Disconnect the upper fitting of the hydraulic tube (3) from the pylon fitting (17).
(7) Remove the hydraulic tube (3) from the engine.
(8) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.

Subtask 29-13-49-020-135-A

B. Removal of the Drain Fitting (18) from the Yellow Hydraulic Pump

NOTE: Removal of the drain fitting (18) is applicable, if visible hydraulic fluid leakage occurs between the drain fitting and the mating surface of the pump. If leakage occurs, remove the drain fitting and replace the O-ring seal (19).

(1) Remove the drain fitting (18) from the hydraulic pump (2) as follows:
(a) Use the WRENCH - STANDARD to remove the drain fitting (18) from the hydraulic pump (2).
(b) Remove and discard the O-Ring seal (19) from the drain fitting (18).
(2) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.

[Rev.10 from 2021] 2026.04.01 08:07:52 UTC