Installation of the Nose-Wheel Steering Cylinder (EV NLG)

TASK 32-51-42-400-001-C-01
Installation of the Nose-Wheel Steering Cylinder (EV NLG)

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: 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.

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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

1. Reason for the Job

NOTE: For the removal/installation of the rear cylinder, you must fully turn the NLG wheels to the right.
To do this, the aircraft must be in one of these configurations:

Front of the aircraft lifted on a jack, or
Nose gear wheels on two greased steel plates (a towbar is necessary to turn the wheels).

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	AIR SOURCE FILTERED, DRY
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	JACK - HYDRAULIC
No specific	AR	PLATE 1.2 M (4 FT) - STEEL, SQUARED
No specific	AR	SAFETY BARRIER(S)
No specific	AR	TOWBAR
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.9 and 0.6 m.daN (79.65 and 53.10 lbf.in )
No specific	Torque wrench: range to between 3.4 and 3 m.daN (25.07 and 22.12 lbf.ft )
No specific	Torque wrench: range to between 7.6 and 6.5 m.daN (56.05 and 47.94 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.03GBB1)	Synthetic Oil base Grease-General Purpose Clay Thickened -
(Material No.03GBC1)	Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. -
(Material No.03HBD9)	Synthetic Ester base Grease-General Purpose Low Temp -
(Material No.06ABB1)	Polysulfide Sealant-Fuel Tank Fillet -
(Material No.06LDG2)	Non Hardening Jointing Putty-High Temp. Area - Structure
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	LOCKWASHERS	AIPC 32-51-42-10-020
15	SEAL AND BACK-UP RING ASSEMBLY	AIPC 32-51-42-10-080
4	LOCKWASHERS	AIPC 32-51-42-20-020
15	SEAL AND BACK-UP RING ASSEMBLY	AIPC 32-51-42-20-080

D. Referenced Information

REFERENCE	DESIGNATION
TASK 07-11-00-581-003-A	Lifting of the Aircraft at the Forward Jacking Point, MLG Wheels on the Ground
TASK 07-11-00-586-001-A	Lowering of the Aircraft at Forward Jacking Point, MLG Wheels on the Ground
TASK 09-10-00-584-002-A	Towing by the Nose Landing Gear from the Front with a Towbar
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-12-29-611-002-A	Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
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 32-51-00-720-003-A	Functional Test of the Nose Wheel Steering with the Handwheel
TASK 32-51-43-400-001-A	Installation of the Nose-Wheel-Steering Anti-Shimmy Valve
TASK 32-69-00-740-001-A	BITE Check of Landing-Gear Control Interface-Unit (LGCIU) With Use of MCDU to Ensure that Continuous BITE is Operative
TASK 12-22-00-00	LUBRICATION - DESCRIPTION AND OPERATION
Nose-Wheel Steering Cylinder

3. Job Set-up
Subtask 32-51-42-860-065-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) In the cockpit, on the center pedestal, make sure that the free-fall control handle is in the normal position.
(2) On the NLG leg, on the electrical box, make sure that the towing lever is in the TOWING position.
(3) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the cylinder.
(4) Make sure that the Green hydraulic system is depressurized
(Ref. AMM TASK 29-10-00-864-001).
(5) For the removal of the rear cylinder, you must fully turn the NLG wheels to the right.
To do this, make sure that the aircraft is in one of these configurations:

Front of the aircraft lifted on a jack, or
Nose gear wheels on two greased steel plates (a towbar is necessary to turn the wheels).

(a) If you make the decision to lift the front of the aircraft with a jack, do these steps:

Lift the front of the aircraft with a jack (Ref. AMM TASK 07-11-00-581-003).
Compress the nose gear with a JACK - HYDRAULIC to disengage the centering cams.
Fully turn the NLG wheels manually to the right.

(b) If you make the decision to use two PLATE 1.2 M (4 FT) - STEEL, SQUARED and a TOWBAR, do these steps:

Put a square steel plate in position in front of the NLG wheels.
Apply a thick layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) to the top surface of the square steel plate.
Put the other square steel plate in position on the top of the greased steel plate.
Move the aircraft and put the NLG wheels in position on the greased steel plates (Ref. AMM TASK 09-10-00-584-002).
Connect the towbar to the NLG leg.
Fully turn the NLG wheels to the right with the towbar.

NOTE: For information about the lubricant grease specification and the lubrication requirements, refer to (Ref. AMM D/O 12-22-00-00).

Subtask 32-51-42-860-065-D ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) In the cockpit, on the center pedestal, make sure that the free-fall control handle is in the normal position.
(2) On the NLG leg, on the electrical box, make sure that the towing lever is in the TOWING position.
(3) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the cylinder.
(4) Make sure that the Yellow hydraulic system is depressurized.
(Ref. AMM TASK 29-10-00-864-002).
(5) For the removal of the rear cylinder, you must fully turn the NLG wheels to the right.
To do this, make sure that the aircraft is in one of these configurations:

Front of the aircraft lifted on a jack, or
Nose gear wheels on two greased steel plates (a towbar is necessary to turn the wheels).

(a) If you make the decision to lift the front of the aircraft with a jack, do these steps:

Lift the front of the aircraft with a jack (Ref. AMM TASK 07-11-00-581-003).
Compress the nose gear with a JACK - HYDRAULIC to disengage the centering cams.
Fully turn the NLG wheels manually to the right.

(b) If you make the decision to use two PLATE 1.2 M (4 FT) - STEEL, SQUARED and a TOWBAR, do these steps:

Put a square steel plate in position in front of the NLG wheels.
Apply a thick layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) to the top surface of the square steel plate.
Put the other square steel plate in position on the top of the greased steel plate.
Move the aircraft and put the NLG wheels in position on the greased steel plates (Ref. AMM TASK 09-10-00-584-002).
Connect the towbar to the NLG leg.
Fully turn the NLG wheels to the right with the towbar.

NOTE: For information about the lubricant grease specification and the lubrication requirements, refer to (Ref. AMM D/O 12-22-00-00).

Subtask 32-51-42-941-060-A

B. Safety Precautions
(1) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons no to operate the landing gear.
(2) Make sure that the SAFETY BARRIER(S) are in position.
(3) Make sure that you obeyed the applicable safety precautions (Ref. AMM TASK 32-00-00-860-001).

Subtask 32-51-42-865-060-A

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34

4. Procedure
Subtask 32-51-42-560-053-A

A. Preparation for Installation

NOTE: The installation procedure is the same for the forward piston and the aft piston.

(1) Make sure that the parts kept from the removed component are clean and in the correct condition.
(2) Lubricate the seal and the back-up ring assembly (15) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(3) Do an inspection of the piston (9):
(a) Do a full visual check around the piston to make sure that the piston external chamfer is in the correct condition

Nose-Wheel Steering Cylinder

(b) If there is no signs of damage on the external chamfer of the piston, refer to Para 4.A.(4).
(c) Measure outer diameters B1 and B4 at the end of the piston along:

The X axis
The Z axis

Nose-Wheel Steering Cylinder

(d) If one of the diameters measured in 4.A.(3)(c) is less than 82.2 mm (3.24 in.), discard the piston (9) and the related steering cylinder (1).

NOTE: AIRBUS recommends that you replace the damaged piston and the related steering cylinder in less than 100 flight cycles to prevent the risk of unscheduled maintenance. A new seal and a new back-up ring must be installed when the piston and the steering cylinder are replaced.

(4) Install the new AIPC 32-51-42-10-080 SEAL AND BACK-UP RING ASSEMBLY (15) or AIPC 32-51-42-20-080 SEAL AND BACK-UP RING ASSEMBLY (15) on the piston (9).
(5) Put the rounded edge of the back-up rings in position against the sides of the seal.
(6) Clean the attachment hardware with Non Aqueous Cleaner-General - - (Material No.08BAA9) and dry it with a AIR SOURCE FILTERED, DRY.
(7) Apply a thin layer of Non Hardening Jointing Putty-High Temp. Area - Structure (Material No.06LDG2) to the threads of all the screws.

Subtask 32-51-42-420-057-A

B. Installation of the Piston and Seal Assembly
(1) Apply a layer of Non Hardening Jointing Putty-High Temp. Area - Structure (Material No.06LDG2) to the internal diameter of the piston (9) and to the bolt (10).
(2) Install the bearing disc (12) on the piston (9).
(3) Put the piston (9) and the seal and back-up ring assembly (15) in position.
(4) Install the bolt (10), washer (13), bushes (11) and nut (14).
(5) TORQUE the nut (14) to between 0.9 and 0.6 m.daN (79.65 and 53.10 lbf.in )

.
(6) Lubricate the seal and back-up ring assembly (15) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .

Subtask 32-51-42-420-058-A

C. Installation of the Steering Cylinder
(1) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the cylinder (1).
(2) Apply Non Hardening Jointing Putty-High Temp. Area - Structure (Material No.06LDG2) to the outer mating diameter and to the mating surfaces of the cylinder (1).
(3) Put the cylinder (1) in position.

NOTE: Before the installation of the rear cylinder, fully turn the NLG wheels manually to the right.

(4) Install the split washer (3).
(5) Install the nine screws (5) and the nine new AIPC 32-51-42-10-020 LOCKWASHERS (4) or AIPC 32-51-42-20-020 LOCKWASHERS (4).
(6) TORQUE the screws (5) to between 3.4 and 3 m.daN (25.07 and 22.12 lbf.ft )

and safety them with the lockwashers (4).
(7) Safety the screws on their support.

(a) Safety the screws (5) on their support with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(8) Install the steering anti-shimmy valve (6) (Ref. AMM TASK 32-51-43-400-001).
(9) Remove the PLUG-BLANKING from each disconnected line end.
(10) Connect the hydraulic couplings (2) to the steering anti-shimmy valve (6).
(11) TORQUE the hydraulic couplings (2) to between 7.6 and 6.5 m.daN (56.05 and 47.94 lbf.ft )

.
(12) Identify the tightened union nuts with a red line (Ref. AMM TASK 20-23-22-910-001).
(13) Apply Polysulfide Sealant-Fuel Tank Fillet - (Material No.06ABB1) to the mating surfaces and to the heads of the bolts (5).
(14) Release the disconnected electrical bundle from the leg.
(15) Remove the CAP-BLANKING from each electrical connector and receptacle.
(16) Connect the electrical connector (8) to the proximity sensor (7).

Subtask 32-51-42-865-061-A

D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34

Subtask 32-51-42-860-066-A

E. Aircraft Maintenance Configuration
(1) After you close the Landing Gear Control and Interface Unit (LGCIU) circuit breakers, put the aircraft back to the correct (ground) condition (Ref. AMM TASK 32-00-00-860-002).

Subtask 32-51-42-720-053-A

F. Test(s)
(1) Do a functional test of the nose wheel steering with the handwheel (Ref. AMM TASK 32-51-00-720-003).

NOTE: It is necessary to do a minimum of five NLG-leg operation cycles. To do this, you must slowly and fully turn the handwheel (75 degrees) to the left and to the right.

(2) Do a BITE check of the landing gear (Ref. AMM TASK 32-69-00-740-001).
(3) Do a check of the fluid level of the applicable hydraulic reservoir. If necessary, fill the reservoir (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).

5. Close-up
Subtask 32-51-42-860-067-A

A. Put the aircraft back to its initial configuration.
(1) If the aircraft is lifted off the ground:
(a) Remove the hydraulic jack to extend the NLG shock absorber.
(b) Lower the aircraft to the ground (Ref. AMM TASK 07-11-00-586-001).
(2) If the NLG wheels are on the greased steel plates, move the aircraft (Ref. AMM TASK 09-10-00-584-002) and remove the greased steel plates and the towbar.
(3) On the NLG leg, on the electrical box, put the towing lever in the normal position (engaged position).
(4) Remove the WARNING NOTICE(S).
(5) Remove the SAFETY BARRIERS.
(6) Remove the CONTAINER 5 L (1.32 USGAL).
(7) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.01 00:51:47 UTC