Removal of the Yellow E-Pump Check Valve

TASK 29-24-21-000-001-A
Removal of the Yellow E-Pump Check Valve

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

FIN: 3083GM

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	CONTAINER 5 L (1.32 USGAL)
No specific	2	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	2	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
196BB, 198CB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
Yellow E-Pump Check Valve (3083GM)

3. Job Set-up
Subtask 29-24-21-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
** ON A/C ALL
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-24-21-860-050-A

B. Aircraft Maintenance Configuration
(1) Open the access door 198CB.
(2) Open the access panel 196BB.

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(3) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(4) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:

in the cockpit on the hydraulic section 40VU of the overhead panel,
on the ground service panel of the Yellow hydraulic system.

(5) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(6) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(7) Put the CONTAINER 5 L (1.32 USGAL) below the HP manifold of the Yellow hydraulic system.
(8) Disconnect the isolation coupling of the power transfer unit (PTU) (Ref. AMM TASK 29-23-00-860-001).

4. Procedure
Subtask 29-24-21-020-050-A

A. Removal of the Yellow E-Pump Check Valve (3083GM)

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL LOOSEN OR TIGHTEN THE UNION TOO MUCH.

(1) Loosen the pipe end-fitting (2) and disconnect the pipe (1) from the check valve (3).
(2) Remove the check valve (3) from the T-fitting (5).
(3) Put a PLUG - BLANKING on the disconnected pipe end-fitting (2) and in the open port of the T-fitting (5).
(4) Remove and discard the packing (4).

[Rev.10 from 2021] 2026.04.01 00:27:03 UTC