Flushing of the Yellow Hydraulic System of the Electrically Driven Pump

TASK 12-36-29-170-006-A
Flushing of the Yellow Hydraulic System of the Electrically Driven Pump

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

1. Reason for the Job
To flush the Yellow hydraulic system after a failure in the electrically driven pump 3075GX.
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	1	CONTAINER 5 L (1.32 USGAL)
No specific	2	LOCALLY MANUFACTURED - ADAPTER
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	1	WARNING NOTICE(S)
ALT29000001	1	HYD GRND PWR UNIT3000

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
196BB, 198CB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-10-00-863-002-A	Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01	Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-13-44-610-001-A	Servicing of the LP-Filter
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
Yellow Hydraulic System of the Electrically Driven Pump 3075GX - Flushing Schematic

3. Job Set-up
Subtask 12-36-29-860-065-A

A. Aircraft Maintenance Configuration
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(3) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002)

Subtask 12-36-29-010-089-A

B. Get Access
(1) Open the right MLG door (Ref. AMM TASK 32-12-00-010-001).
(2) Open the access door 198CB.
(3) Open the access panel 196BB.

Subtask 12-36-29-860-066-A

C. Preparation for the Flushing Procedure
(1) Put the ACCESS PLATFORM 2M (6 FT) in position at the Zone 148.
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(3) Put the WARNING NOTICE(S) in position
(4) Put a CONTAINER 5 L (1.32 USGAL) in position to collect the hydraulic fluid below:

the electrically driven pump 3075GX and
the LP manifold 3003GM.

(5) Disconnect the pressure line from the electrically driven pump 3075GX.
(6) Disconnect the case drain line from the electrically driven pump 3075GX.
(7) Disconnect the case drain line from the LP manifold 3003GM.
(8) Put the ALT29000001 HYD GRND PWR UNIT3000 in position as necessary.

CAUTION: MAKE SURE THAT THE FLOW RATE AND THE SUPPLY PRESSURE ON THE GROUND HYDRAULIC CART ARE SET TO A MINIMUM.

(9) Connect the pressure hose of the ALT29000001 HYD GRND PWR UNIT3000 to the case drain line at the electrically driven pump 3075GX with an LOCALLY MANUFACTURED - ADAPTER.
(10) Connect the return hose of the ALT29000001 HYD GRND PWR UNIT3000 to the case drain line at the LP manifold 3003GM with an LOCALLY MANUFACTURED - ADAPTER.
(11) Put the PLUG-BLANKING in each disconnected line end.

4. Procedure
Subtask 12-36-29-170-055-A

A. Flush the Yellow hydraulic system.
(1) Operate the hydraulic power cart for 20 s at 20 bar (290.0754 psi).
(2) Stop the hydraulic power cart.
(3) Disconnect the pressure hose of the hydraulic power cart and the adaptor from the case drain line.
(4) Disconnect the return hose of the hydraulic power cart and the adaptor from the case drain line.
(5) Remove the blanking plugs.

CAUTION: MAKE SURE THAT THE FLOW RATE AND THE SUPPLY PRESSURE ON THE GROUND HYDRAULIC CART ARE SET TO A MINIMUM.

(6) Connect the pressure hose of the hydraulic power cart to the pressure line at the electrically driven pump 3075GX with an LOCALLY MANUFACTURED - ADAPTER.
(7) Connect the return hose of the hydraulic power cart to the delivery connector 3008GM with an LOCALLY MANUFACTURED - ADAPTER.
(8) Put the PLUG-BLANKING in each disconnected line end.
(9) Operate the hydraulic power cart for 20 s at 20 bar (290.0754 psi).
(10) Stop the hydraulic power cart.

Subtask 12-36-29-960-055-A

B. Replace the LP filter element (Ref. AMM TASK 29-13-44-610-001).

5. Close-up
Subtask 12-36-29-860-067-A

A. Put the system back to the serviceable condition.
(1) Disconnect the return hose of the hydraulic power cart and the adaptor from the delivery connector 3008GM.
(2) Disconnect the pressure hose of the hydraulic power cart and the adaptor from the pressure line.
(3) Remove the hydraulic power cart.
(4) Remove the blanking plugs.
(5) Connect the case drain line to the electrically driven pump 3075GX.
(6) Connect the pressure line to the electrically driven pump 3075GX.
(7) Connect the case drain line to the LP manifold 3003GM.

Subtask 12-36-29-790-055-A

B. Leak Test of the Connections which were Disconnected
(1) Pressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-863-002).
(2) Make sure that there is no hydraulic fluid leakage.
(3) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-863-003).

Subtask 12-36-29-942-094-A

C. Put the aircraft back to its initial configuration.
(1) Remove the containers.
(2) Remove the safety barriers
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

Subtask 12-36-29-410-076-A

D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).
(3) Close the access door 198CB.
(4) Close the access panel 196BB.
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 06:10:39 UTC