Removal of the Top Case Drain Hose/Tube Assembly

TASK 29-11-49-000-003-A
Removal of the Top Case Drain Hose/Tube Assembly

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: DO NOT TOUCH THE HYDRAULIC SYSTEM COMPONENTS FOR A SHORT TIME AFTER THE ENGINE IS SHUTDOWN. THE ENGINE COMPONENTS STAY HOT FOR SOME TIME AND CAN CAUSE INJURY.

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 1M (3 FT)-ADJUSTABLE
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL

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
Top Case Drain Hose/Tube Assembly
FOR [1000EM1] (ENGINE-1)
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors

3. Job Set-up
Subtask 29-11-49-860-069-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) in position on the access door 195BB to tell persons not to pressurize the Green hydraulic reservoir.

Subtask 29-11-49-941-067-A ** ON A/C NOT FOR ALL

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

put WARNING NOTICE(S) 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 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 PWR/1(2) pushbutton switch is off.

(5) Put WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(6) Put a CONTAINER 5 L (1.32 USGAL) below the suction-hose adapter connection to the hydraulic pump.

Subtask 29-11-49-865-061-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34

Subtask 29-11-49-010-067-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the left fan cowl door:
(a) FOR [1000EM1] (ENGINE-1)
open the door 437AL (Ref. AMM TASK 71-13-00-010-040).
(2) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position at the engine.

4. Procedure
Subtask 29-11-49-020-061-A ** ON A/C NOT FOR ALL

A. Removal of the Top Case Drain Hose/Tube Assembly
(1) Disconnect the drain hose/tube (20) from the hydraulic filter assembly and let the fluid flow into the container.

NOTE: Use a second wrench to hold the union on the filter assembly when you loosen the coupling nut on the drain hose/tube (20).

(2) Remove the bolt (25), the washer (10) and the clamp (15) that attach the drain hose/tube (20) to the lower mid channel.
(3) Remove the bolt (5), the washer (10) and the clamp (15) that attach the drain hose/tube (20) to the higher mid channel.
(4) Remove the bolt (5), the washer (10) and the clamp (15) that attach the drain hose/tube (20) to the higher bracket.
(5) Disconnect the pressure-relief valve tube from the tee-fitting on the drain hose/tube (20).

NOTE: Use a second wrench to hold the wrenching flats on the tee-fitting when you loosen the coupling nut on the pressure-relief valve tube.

(6) Disconnect the drain hose/tube (20) from the fluid disconnect panel at the top of the engine.
(7) Remove the drain hose/tube (20) from the engine.
(8) Put COVER - PROTECTION on the drain hose/tube (20), the union in the filter assembly, the pressure-relief valve tube, and the fitting on the fluid disconnect panel.

[Rev.10 from 2021] 2026.04.01 08:00:22 UTC