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

TASK 32-51-42-000-001-C-01
Removal 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).

NOTE: If it is necessary to remove the rear and the front cylinders, you must start with the rear cylinder.

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

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
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	PLUG - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SPATULA - PLASTIC
No specific	AR	TOWBAR
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03GBB1)	Synthetic Oil base Grease-General Purpose Clay Thickened -
(Material No.03HBD9)	Synthetic Ester base Grease-General Purpose Low Temp -

C. 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 09-10-00-584-002-A	Towing by the Nose Landing Gear from the Front with a Towbar
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 32-51-43-000-001-A	Removal of the Nose-Wheel-Steering Anti-Shimmy Valve
TASK 12-22-00-00	LUBRICATION - DESCRIPTION AND OPERATION
Nose-Wheel Steering Cylinder

3. Job Set-up
Subtask 32-51-42-860-064-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, put the towing lever in the TOWING position.
(3) Depressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-864-001).
(4) For the removal 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).

(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) 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 32-51-42-860-064-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, put the towing lever in the TOWING position.
(3) Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-864-002).
(4) For the removal 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
NLG 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 the steps that follow:

Lift the front of the aircraft with a jack (Ref. AMM TASK 07-11-00-581-003).
Compress the NLG 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 the steps that follow:

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) 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 32-51-42-941-059-A

B. Safety Precautions
(1) Put the WARNING NOTICE(S) in position to tell persons not to operate the landing-gear control lever.
(2) Put the CONTAINER 5 L (1.32 USGAL) in position below the cylinder to collect the hydraulic fluid.
(3) Put the SAFETY BARRIER(S) in position.
(4) Obey the applicable safety precautions before you open the Landing Gear Control and Interface Unit (LGCIU) circuit breakers (Ref. AMM TASK 32-00-00-860-001).

Subtask 32-51-42-865-059-A

C. Open, safety and tag 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

4. Procedure
Subtask 32-51-42-020-057-A

A. Removal of the Steering Cylinder

NOTE: The removal procedure is the same for the front cylinder and the rear cylinder.
We recommend that you start with the rear cylinder.

(1) Before the removal of the cylinder, do the steps that follow:
(a) Make sure that the NLG wheels are fully turned to the right.
(b) Disconnect the electrical connector (8) from system 1 NLG external-proximity-sensor (24GA) (7).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Attach the disconnected electrical bundle to the leg during the maintenance.
(2) Precaution:
(3) When you remove the rubber protective layer, use a SPATULA - PLASTIC to prevent damage to the surfaces of the components.
(4) Disconnect the hydraulic couplings (2) from the steering anti-shimmy valve (6) and drain the hydraulic fluid into a CONTAINER 5 L (1.32 USGAL).
(5) Put the PLUG-BLANKING in each disconnected line end.
(6) Remove the steering anti-shimmy valve (6) (Ref. AMM TASK 32-51-43-000-001).
(7) If you installed lockwire, remove and discard it.

(a) Cut and discard the lockwire of the nine screws (5).
(8) Remove the nine screws (5) and the lockwashers (4). Discard the lockwashers (4).
(9) Remove the split washer (3).
(10) Remove the cylinder (1).

Subtask 32-51-42-020-058-A

B. Removal of the Piston and Seal Assembly

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

(1) Remove the nut (14), washer (13), bushes (11) and bolt (10).
(2) Remove the piston (9).
(3) Remove the bearing disc (12).
(4) Remove the seal and back-up ring assemblies (15) and discard them.

[Rev.10 from 2021] 2026.04.01 00:51:44 UTC