Removal of the Hydraulic Pressure Hose

TASK 29-11-49-000-807-A
Removal of the Hydraulic Pressure Hose

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.

WARNING: YOU MUST NOT GET HYDRAULIC FLUID ON YOUR SKIN, IN YOUR EYES OR IN YOUR MOUTH. THE HYDRAULIC FLUID IS POISONOUS AND CAN BE ABSORBED INTO YOUR BODY. IF YOU ACCIDENTALLY GET HYDRAULIC FLUID IN YOUR EYES, MOUTH OR ON YOUR SKIN, FLUSH WITH WATER AND GET MEDICAL AID.

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: OBEY THE HYDRAULIC SAFETY PROCEDURES.

ZONE: 413

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	1	CONTAINER 1 L (1/4 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
413	UPPER FWD PYLON
195BB, 197CB
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 452AR

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 71-00-00-860-833-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
Hydraulic Pressure Hose ** ON A/C NOT FOR ALL
Hydraulic Pressure Hose ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 29-11-49-860-139-A ** ON A/C NOT FOR ALL

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

Subtask 29-11-49-941-110-A ** ON A/C NOT FOR ALL

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 WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system on the ground service panel.
(3) On the HYD section of panel 40VU:

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

Subtask 29-11-49-010-127-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 29-11-49-040-073-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 29-11-49-010-128-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

4. Procedure
Subtask 29-11-49-020-126-B ** ON A/C NOT FOR ALL

A. Removal of the Hydraulic Pressure Hose

CAUTION: YOU MUST USE A WRENCH TO HOLD THE MATING PARTS WHEN YOU LOOSEN OR TIGHTEN THE TUBE NUTS. IF YOU DO NOT OBEY THIS CAUTION, YOU CAN TWIST OR CAUSE DAMAGE TO THE TUBES.

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

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

(1) Remove the hydraulic pressure hose (1).
(a) Put a CONTAINER 1 L (1/4 USGAL) below the hydraulic pressure hose (1).
(b) Hold the hydraulic inline damper with a WRENCH - STANDARD and disconnect the hydraulic pressure hose (1) from the hydraulic inline damper on the hydraulic pump.
(c) Drain the hydraulic fluid from the lower end of the hydraulic pressure hose (1) into the CONTAINER 1 L (1/4 USGAL).
(d) Disconnect the hydraulic pressure hose (1) from the pylon fuel-hydraulic panel.
(e) Drain the hydraulic fluid from the hydraulic pressure hose (1) into the CONTAINER 1 L (1/4 USGAL).
(f) Remove the hydraulic pressure hose (1) from the engine.

NOTE: There is remaining hydraulic fluid inside the hydraulic pressure hose (1). Hold the hydraulic pressure hose (1) vertically to prevent flow out of the hydraulic fluid.

(2) Installation of the protection covers

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Install COVER - PROTECTION on the hydraulic pressure hose (1), the hydraulic inline damper on the hydraulic pump, and the pylon fuel-hydraulic panel interface.

[Rev.10 from 2021] 2026.04.01 07:59:29 UTC