Flushing of the Blue Hydraulic System of the Electrically Driven Pump

TASK 12-36-29-170-003-A
Flushing of the Blue 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.

FIN: 2075GJ

1. Reason for the Job
Flushing of the Blue hydraulic system after a failure in the electrically driven pump 2075GJ.
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	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
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
195BB, 197EB, 197FB

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 29-10-00-863-003-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 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-12-43-610-001-A	Servicing of the Electric-Pump Case-Drain Filter
TASK 29-12-45-610-001-A	Servicing of the HP-Filter
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
Blue Hydraulic System of the Electrically Driven Pump 2075GJ - Flushing Schematic ** ON A/C NOT FOR ALL
Blue Hydraulic System of the Electrically Driven Pump 2075GJ - Flushing Schematic ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 12-36-29-860-056-A

A. Aircraft Maintenance Configuration
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).
(3) Depressurize the reservoir of the Blue 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 12-36-29-010-086-A

B. Get Access
(1) Open the access panel 195BB.
(2) Open the access doors 197EB 197FB.

Subtask 12-36-29-860-057-A

C. Preparation for the Flushing Procedure
(1) Put the WARNING NOTICE(S) in position.
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(3) Put the ACCESS PLATFORM 2M (6 FT) in position at the Zone 195.
(4) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the Zone 197.
(5) Put a CONTAINER 5 L (1.32 USGAL) in position to collect the hydraulic fluid below:

the electrically driven pump 2075GJ,
the case drain filter 2084GM,
the LP filter 2002GM,
the check valve 2041GM.

(6) Disconnect the case-drain lower line from the electrically driven pump 2075GJ.
(7) Disconnect the pressure line from the electrically driven pump 2075GJ.
(8) Disconnect the case-drain lower line from the check valve 2041GM.
(9) Disconnect the case-drain upper line from the case-drain filter 2084GM.
(10) Disconnect the case-drain upper line from the LP filter 2002GM.
(11) Connect the pressure line and the case-drain lower line together with a union.
(12) 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.

(13) Connect the pressure hose of the ALT29000001 HYD GRND PWR UNIT3000 to the check valve end of the case-drain lower line with an LOCALLY MANUFACTURED - ADAPTER.
(14) Connect the return hose of the hydraulic power cart to the delivery connector 2008GM with an LOCALLY MANUFACTURED - ADAPTER.
(15) Put the PLUG-BLANKING in each disconnected line end.

4. Procedure
Subtask 12-36-29-170-052-A

A. Flush the Blue 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 lower line.
(4) Disconnect the return hose of the hydraulic power cart and the adaptor from the delivery connector 2008GM.
(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 case-drain filter 2084GM end of the case-drain upper line with an LOCALLY MANUFACTURED - ADAPTER.
(7) Connect the return hose (of the hydraulic power cart) to the LP filter 2002GM end of the case-drain upper line 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 12-36-29-960-052-A

B. Replace the subsequent components:
(1) The HP filter element (Ref. AMM TASK 29-12-45-610-001).
(2) The case-drain filter element (Ref. AMM TASK 29-12-43-610-001).

5. Close-up
Subtask 12-36-29-860-058-A

A. Put the system back to the serviceable condition.
(1) Disconnect the pressure and return hoses of the hydraulic power cart and the adaptors from the case-drain upper line.
(2) Disconnect and remove the union from the pressure line and the case-drain lower line.
(3) Remove the hydraulic power cart.
(4) Remove the blanking plugs.
(5) Connect the case-drain upper line to the LP filter 2002GM.
(6) Connect the case-drain upper line to the case drain filter 2084GM.
(7) Connect the case-drain lower line to the check valve 2041GM.

NOTE: The check valve 2041GM is not in the flush circuit. If it is necessary remove and clean it.

(8) Connect the pressure line and the case-drain lower line to the electrically driven pump 2075GJ.

Subtask 12-36-29-790-052-A

B. Leak Test of the Components which were Disconnected
(1) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
(2) Make sure that there is no hydraulic fluid leakage.
(3) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).

Subtask 12-36-29-942-091-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 12-36-29-410-073-A

D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 197EB 197FB.
(3) Close the access panel 195BB.
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 06:10:38 UTC