Removal of the Hydraulic Case Drain Tubes

TASK 29-11-49-000-012-A
Removal of the Hydraulic Case Drain Tubes

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: DO NOT GET HYDRAULIC FLUID ON YOUR SKIN, IN YOUR EYES OR IN YOUR MOUTH. HYDRAULIC FLUID IS POISONOUS AND CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY. FLUSH HYDRAULIC FLUID FROM YOUR EYES, MOUTH OR SKIN WITH WATER. GET MEDICAL AID IF YOU GET HYDRAULIC FLUID IN YOUR EYES OR MOUTH.

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. 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	AR	CONTAINER - CLEAN, APPLICABLE
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (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
Hydraulic Tube Details
Hydraulic Tube Details
Hydraulic Tube Details
FOR [1000EM1] (ENGINE-1)
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)

3. Job Set-up
Subtask 29-11-49-869-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(2) Depressurize the Green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system:

on the ground service panel 197CB.

(4) Put WARNING NOTICE(S) on the access door 195BB to tell persons not to pressurize the Green hydraulic reservoir.

Subtask 29-11-49-941-052-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:

make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to start the engine.

(2) Make sure that the engine 1 (2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system:

in the cockpit, on the HYD section of the overhead panel 40VU.

(4) On the overhead maintenance panel 50VU:

make sure that the ON legend of the ENG/FADEC GND PWR1 pushbutton switch is off.

(5) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to push the ENG/FADEC GND PWR1 pushbutton switch.
(6) Put a CONTAINER 5 L (1.32 USGAL) below the suction-hose adapter connection to the hydraulic pump.

Subtask 29-11-49-010-052-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowls:
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR (Ref. AMM TASK 71-13-00-010-010).
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the engine.

4. Procedure
Subtask 29-11-49-680-051-A ** ON A/C NOT FOR ALL

A. Drain the hydraulic fluid from the case drain tubes.
(1) Put the CONTAINER - CLEAN, APPLICABLE in position below the hydraulic pump.
(2) Cut and discard the lockwire from the connection of the hose (8).
(3) Hold the union (55) with an applicable wrench and disconnect the hose (8) from the union.
(4) Let the hydraulic fluid drain in to the container.

Subtask 29-11-49-020-052-A ** ON A/C NOT FOR ALL

B. Remove the hydraulic case-drain tubes.
(1) Write the positions of these parts before removal:
(a) The clamps (14), (17), (37) and (39) and the clip (53)
(b) The bolts (13), (16), (36), (40) and (54).
(c) The hoses (3) and (8) and the tube (5).

NOTE: You must write the position of these parts. This makes sure that they are installed in the correct position during the installation task.

(2) Remove the upper hose (3).
(a) Remove the bolts (13) and (16) from the clamps (14) and (17).
(b) Hold the union (31) with an applicable wrench and disconnect the hose (3).
(c) Remove the hose (3) from the clamps (14) and (17).
(d) Hold the hose (3) and disconnect it from the aircraft pylon interface.
(e) Remove the hose (3) from the engine.
(3) Remove the tube (5).
(a) Hold the union (31) with an applicable wrench and loosen the end connector of the tube (5) and the nut (30).
(b) Hold the union (51) with an applicable wrench and loosen the end connector of the tube (5).
(c) Remove the three bolts (40) and the top of the clamp (39) from the engine.
(d) Safety the bottom of the clamp (39) to the raft (38) with temporary ties.
(e) Remove the three bolts (36) and the top of the clamp (37) from the engine.
(f) Safety the bottom of the clamp (37) to the raft (34) with temporary ties.
(g) Disconnect the end connectors of the tube (5) from the unions (31) and (51) and remove the tube from the engine.
(4) Remove the lower hose (8).
(a) Hold the union (52) with an applicable wrench and disconnect the end connector of the hose (8).
(b) Hold the hose (8). Remove the bolt (54) which attaches the clip (53) to the bracket.
(c) Remove the hose (8) from the engine.
(5) Put the applicable COVER - BLANKING on all the openings.
(6) Transferable parts removal.
(a) Remove the clip (53) from the hose (8).

[Rev.10 from 2021] 2026.04.01 00:17:35 UTC