Bleeding of the MLG Actuating Cylinder

TASK 32-31-46-600-001-A
Bleeding of the MLG Actuating Cylinder

WARNING: MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

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.

FIN: 2503GM
FIN: 2504GM

1. Reason for the Job
To bleed unwanted air from the actuating cylinders of the MLG.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	GROUND POWER CART-HYDRAULIC
No specific	AR	SAFETY BARRIER(S)
No specific	1	WARNING NOTICE(S)
460005835	2	SLEEVE - GROUND LOCK
98D32203502000	2	SAFETY PIN - NLG DOOR
D23080000	1	PIN-GROUND LOCK,NLG

B. Referenced Information

REFERENCE	DESIGNATION
TASK 07-11-00-581-001-A	Lifting for Aircraft Maintenance Operations
TASK 07-11-00-586-002-A	Lowering of the Aircraft for Maintenance Operations
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
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 29-10-00-863-001-A	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
TASK 32-00-00-481-002-A	Installation of the Safety Devices on the Landing Gear Doors
TASK 32-00-00-860-001-A	Flight Configuration Precautions with Electrical Power
TASK 32-00-00-860-001-A-01	Flight Configuration Precautions without Electrical Power
TASK 32-00-00-860-002-A	Ground Configuration after Flight Configuration with Electrical Power
TASK 32-00-00-860-002-A-01	Ground Configuration after Flight Configuration without Electrical Power
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 32-22-00-010-001-A	Nose Gear Doors - Ground Doors Opening
TASK 32-22-00-410-001-A	Nose Gear Doors - Ground Doors Closing

3. Job Set-up
Subtask 32-31-46-941-055-A

A. Safety Precautions
(1) Put the SAFETY BARRIER(S)S in position.
(2) Install the ground safety locks on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On panel 400VU:

Make sure that the landing-gear control-lever 6GA is in the DOWN position
Put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear.

(4) On panel 110VU, make sure that the GRAVITY GEAR EXTN handle is folded into the center console.

Subtask 32-31-46-860-054-A

B. Aircraft Maintenance Configuration
(1) Lift the aircraft on jacks (Ref. AMM TASK 07-11-00-581-001).

Subtask 32-31-46-869-056-A

C. Flight Configuration Precautions
(1) Do the flight configuration precautions (Ref. AMM TASK 32-00-00-860-001).

Subtask 32-31-46-865-054-A

D. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
** ON A/C NOT FOR ALL
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32
** ON A/C ALL
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
** ON A/C NOT FOR ALL
121VU	LGCIU/BAT SPLY/SYS2	59GA	R32
121VU	LGCIU/BAT SPLY/SYS1	58GA	R31

Subtask 32-31-46-860-056-A

E. Aircraft Maintenance Configuration
(1) Connect a GROUND POWER CART-HYDRAULIC to the aircraft (Ref. AMM TASK 29-10-00-863-001). Do not pressurize the Green hydraulic system until told to do so in Paragraph 4.A.
(2) Energize the electrical circuits from the external power (Ref. AMM TASK 24-41-00-861-002).
(3) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
(4) Install a 460005835 SLEEVE - GROUND LOCK on each MLG door (Ref. AMM TASK 32-00-00-481-002).
(5) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(6) Install a 98D32203502000 SAFETY PIN - NLG DOOR in each NLG door (Ref. AMM TASK 32-00-00-481-002).
(7) Install the D23080000 PIN-GROUND LOCK,NLG in the NLG lock stay (Ref. AMM TASK 32-00-00-481-001).
(8) Remove the ground safety lock from the applicable MLG.
(9) Remove the safety stay from FR73/74.
(10) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only) (Ref. AMM TASK 31-60-00-860-001).

4. Procedure
Subtask 32-31-46-870-051-A

WARNING: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR ARE CLEAR.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

A. Bleeding MLG Actuating Cylinder

NOTE: Two persons are necessary for this procedure. One person must be in the cockpit to operate the landing-gear control lever (6GA). The other person must be near the MLG to operate the GROUND POWER CART-HYDRAULIC and to monitor the movement of the MLG. The two persons must be able to speak to each other.

(1) Start the GROUND POWER CART-HYDRAULIC. Make sure that:

The necessary minimum flow capacity from the GROUND POWER CART-HYDRAULIC is 140 l.min (36.9838 USgal.mn).
You start the GROUND POWER CART-HYDRAULIC in no-load position and there is no flow from the hydraulic rig.
You do not pressurize the Green hydraulic system.

(2) On panel 400VU:

Move the landing-gear control lever (6GA) to the UP position.

(3) At the GROUND POWER CART-HYDRAULIC:

Carefully open the flow control valve to make the landing gear retract to between 20 and 30 degrees from the vertical.

NOTE: The rate of retraction of the landing gear is controlled by the position of the flow control valve.

(4) At the GROUND POWER CART-HYDRAULIC:

Close the flow control valve.

NOTE: This will stop the movement of the MLG.

(5) On panel 400VU:

Move the landing-gear control lever (6GA) to the DOWN position.

(6) At the GROUND POWER CART-HYDRAULIC:

Carefully open the flow control valve to extend the MLG.

NOTE: The rate of extension of the landing gear is controlled by the position of the flow control valve.

(7) In the cockpit:

Make sure the applicable MLG is in the locked down position.

(8) At the GROUND POWER CART-HYDRAULIC:

Fully close the flow control valve.

(9) Do the steps (2) thru (8) again for a minimum of ten times to fully bleed the system.

5. Close-up
Subtask 32-31-46-860-055-A

A. Aircraft Maintenance Configuration
(1) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002)
(2) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(3) Install the ground safety lock on the applicable MLG.
(4) Remove the ground safety locks and close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(5) Remove the ground safety locks and close the NLG doors (Ref. AMM TASK 32-22-00-410-001).
(6) De-energize the electrical circuits from the external power (Ref. AMM TASK 24-41-00-862-002).

Subtask 32-31-46-586-051-A

B. Lower the Aircraft
(1) Lower the aircraft to the ground (Ref. AMM TASK 07-11-00-586-002).

Subtask 32-31-46-860-057-A

C. Aircraft Configuration
(1) Do the aircraft ground configuration procedure (Ref. AMM TASK 32-00-00-860-002).

Subtask 32-31-46-942-052-A

D. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the SAFETY BARRIER(S)S.
(3) Remove the WARNING NOTICE(S).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:45:30 UTC