Flushing of the Yellow Hydraulic System of the Engine Driven Pump (EDP)

TASK 12-36-29-170-002-A
Flushing of the Yellow Hydraulic System of the Engine Driven Pump (EDP)

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 engine driven pump 3030GD.
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
198CB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-32-29-281-001-A	Analyze Hydraulic Fluid
TASK 12-36-29-600-002-A	Change of the Hydraulic Fluid in the Yellow Hydraulic System - with Ground Cart Available
TASK 12-36-29-615-002-A	Clean the Fluid in the Yellow Hydraulic System
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 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-13-43-610-010-A	Servicing of the Engine-Pump Case-Drain Filter
TASK 29-13-43-610-041-A	Servicing of the Engine Pump Case-Drain Filter
TASK 29-13-45-610-001-A	Servicing of the HP-Filter
TASK 29-13-51-000-010-A	Removal of the Engine Pump
TASK 29-13-51-400-010-A	Installation of the Engine Pump
TASK 29-13-51-860-001-A	Hydraulic Maintenance Procedure after an Engine Installation (with Engine Pump Installed) or after an Engine Pump Installation
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
TASK 71-00-00-710-012-B	Test No.3 : Idle Leak Check
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 78-31-51-000-011-A	Removal of the Thrust Reverser HCU Filter Cartridge
TASK 78-31-51-400-011-A	Installation of the Thrust Reverser HCU Filter Cartridge
Yellow Hydraulic System of the EDP 3030GD - Flushing Schematic

3. Job Set-up
Subtask 12-36-29-860-053-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 12-36-29-010-085-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the right MLG door (Ref. AMM TASK 32-12-00-010-001).
(2) Open the engine 2 fan-cowl doors (Ref. AMM TASK 71-13-00-010-040).
(3) Open the access door 198CB.

Subtask 12-36-29-010-085-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the right MLG door (Ref. AMM TASK 32-12-00-010-001).
(2) Open the engine 2 fan-cowl doors (Ref. AMM TASK 71-13-00-010-010).
(3) Open the access door 198CB.

Subtask 12-36-29-010-085-C ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the right MLG door (Ref. AMM TASK 32-12-00-010-001).
(2) Open the engine 2 fan-cowl doors (Ref. AMM TASK 71-13-00-010-040).
(3) Open the access door 198CB.

Subtask 12-36-29-860-054-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 below the Zone 147.
(4) Put a CONTAINER 5 L (1.32 USGAL) in position to collect the hydraulic fluid below:

the engine driven pump 3030GD,
the case drain filter 3084GM,
the LP manifold 3003GM.

(5) Disconnect the case-drain lower line from the engine driven pump 3030GD.
(6) Disconnect the pressure line from the engine driven pump 3030GD.
(7) Disconnect the case-drain upper and lower lines from the case drain filter 3084GM.
(8) Disconnect the case-drain upper line from the LP manifold 3003GM.
(9) Connect the pressure line and the case-drain lower line together with a union.
(10) 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.

(11) Connect the pressure hose of the ALT29000001 HYD GRND PWR UNIT3000 to the filter end of the case-drain lower-line with an LOCALLY MANUFACTURED - ADAPTER.
(12) Connect the return hose of the hydraulic power cart to the delivery connector 3008GM with an LOCALLY MANUFACTURED - ADAPTER.
(13) Put the PLUG-BLANKING in each disconnected line end.

4. Procedure
Subtask 12-36-29-170-051-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 lower line.
(4) Disconnect the return hose of the hydraulic power cart and the adaptor from the delivery connector 3008GM.
(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 filter end of the case-drain upper-line with an LOCALLY MANUFACTURED - ADAPTER.
(7) Connect the return hose of the hydraulic power cart to the manifold 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 12-36-29-960-051-A ** ON A/C NOT FOR ALL

B. Replace the subsequent components:
(1) The case-drain filter element (Ref. AMM D/O 29-13-43-61).
(2) The HP filter element (Ref. AMM TASK 29-13-45-610-001).

Subtask 12-36-29-960-051-C ** ON A/C NOT FOR ALL

B. Replace the subsequent components:
(1) The case-drain filter element (Ref. AMM TASK 29-13-43-610-010).
(2) The HP filter element (Ref. AMM TASK 29-13-45-610-001).

Subtask 12-36-29-960-051-D ** ON A/C NOT FOR ALL

B. Replace the subsequent components:
(1) The case-drain filter element (Ref. AMM TASK 29-13-43-610-041).
(2) The HP filter element (Ref. AMM TASK 29-13-45-610-001).

Subtask 12-36-29-170-064-B ** ON A/C NOT FOR ALL

C. Flush the Yellow Hydraulic System

NOTE: This is an alternative procedure to flush the Yellow hydraulic system.

(1) Replace the engine driven pump 3030GD (Ref. AMM TASK 29-13-51-000-010) and (Ref. AMM TASK 29-13-51-400-010).
(2) Drain the Yellow hydraulic system reservoir and service with new hydraulic fluid (Ref. AMM TASK 12-36-29-600-002).
(3) Replace the components that follow:
(a) The thrust reverser hydraulic control-unit filter (Ref. AMM TASK 78-31-51-000-011) and (Ref. AMM TASK 78-31-51-400-011).
(b) The case-drain filter element (Ref. AMM TASK 29-13-43-610-010).
(c) The HP filter element (Ref. AMM TASK 29-13-45-610-001).
(4) Do dry cranking of the engine driven pump 3030GD (Ref. AMM TASK 29-13-51-860-001).
(5) Ground run the engine for a minimum of 15 minutes (Ref. AMM TASK 71-00-00-710-012).
(a) Make sure that the engine driven pump 3030GD does not overheat.
(b) Do a check of the filter clogging indicator and HP/case drain filter bowl for Foreign Object Damage (FOD).
(6) If the engine pump 3030GD overheats or FOD is found in the filter clogging indicator and HP/case-drain filter bowl, do the steps in Para.4.C.(3) again.
(7) Do a fluid sample of the Yellow hydraulic system (Ref. AMM TASK 12-32-29-281-001).

NOTE: The fluid sample must be available in 10 days.

(8) If the fluid sample is in the correct limits, no more work is necessary.
(9) If the fluid sample is not in the correct limits, clean the hydraulic fluid in the Yellow hydraulic system (Ref. AMM TASK 12-36-29-615-002).

5. Close-up
Subtask 12-36-29-860-055-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 manifold 3003GM and the case drain filter 3084GM.
(6) Connect the case-drain lower line to the case drain filter 3084GM.
(7) Connect the pressure line and the case-drain lower line to the engine driven pump 3030GD.

Subtask 12-36-29-790-051-A

B. Leak Test of the Components 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 29-10-00-864-002).

Subtask 12-36-29-942-090-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 12-36-29-410-072-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the engine 2 fan-cowl doors (Ref. AMM TASK 71-13-00-410-040).
(3) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).
(4) Close the access door 198CB.
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 12-36-29-410-072-B ** ON A/C NOT FOR ALL

D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the engine 2 fan-cowl doors (Ref. AMM TASK 71-13-00-410-010).
(3) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).
(4) Close the access door 198CB.
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 12-36-29-410-072-C ** ON A/C NOT FOR ALL

[Rev.10 from 2021] 2026.03.31 22:58:25 UTC