Removal of the NLG Shock Absorber Assy (with nose jacking only)

TASK 32-21-13-000-001-A-01
Removal of the NLG Shock Absorber Assy (with nose jacking only)

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 SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	1	HOIST 500 KG (1100 LB)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	STRAP - LIFTING
No specific	AR	STRAP-RATCHET
No specific	1	TROLLEY - LIFTING
No specific	AR	WARNING NOTICE(S)
J47564	1	ADAPTOR
J47999	1	GUIDE CONE

B. 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 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 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
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 32-21-18-000-001-A	Removal of the NLG Lock Springs
TASK 32-21-27-000-002-A	Removal of the Torque-Link Center Hinge
TASK 32-22-00-010-001-A	Nose Gear Doors - Ground Doors Opening
TASK 32-41-12-000-001-A	Removal of the NLG Wheel
NLG Shock Absorber Assy ** ON A/C NOT FOR ALL
Strap Around the Shock Absorber
Strap Around the NLG Turning Tube
Hoist Strapped to Upper Drag Strut
NLG Shock Absorber ** ON A/C NOT FOR ALL
NLG Shock Absorber ** ON A/C NOT FOR ALL
NLG Shock Absorber Assy ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 32-21-13-941-057-A

A. Safety Precautions
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) In the cockpit, on right-center-instrument panel 400VU, put WARNING NOTICE(S) in position to tell persons not to operate the landing-gear control lever.
(3) On the steering handwheel (CAPT and F/O) and on the brake pedals, put WARNING NOTICE(S) in position to tell persons not to operate them.
(4) Put the SAFETY BARRIER(S) in position. Put a CONTAINER 5 L (1.32 USGAL) for hydraulic fluid in position.
(5) Install the safety devices on the landing gears (Ref. AMM TASK 32-00-00-481-001).
(6) Obey the applicable safety precautions before you open the LGCIU circuit breakers (Ref. AMM TASK 32-00-00-860-001).

Subtask 32-21-13-865-059-A

B. 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/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34

Subtask 32-21-13-860-058-A

C. Aircraft Maintenance Configuration
(1) Make sure that the Green hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(2) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(3) Lift the aircraft with jack at the forward jacking point as per (Ref. AMM TASK 07-11-00-581-003).

Subtask 32-21-13-010-053-A

D. Get Access
(1) Open the doors of the nose landing gear (Ref. AMM TASK 32-22-00-010-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position in zone 123.

4. Procedure
Subtask 32-21-13-020-059-B

A. Preparation before Removal
(1) Remove the wheels of the nose landing gear (Ref. AMM TASK 32-41-12-000-001).
(2) Lightly loosen the valve (1) to bleed the nitrogen from the shock absorber (10).
(3) Disconnect the center hinge as follows:

CAUTION: WHEN YOU MOVE UP THE UPPER TORQUE LINK, MAKE SURE THAT THERE IS NO CONTACT BETWEEN THE PROTECTIVE SUPPORT OF THE SHOCK-ABSORBER PROXIMITY SENSORS, THE LEVER AND THE LINK ASSEMBLY.

(a) Disconnect the center hinge (Ref. AMM TASK 32-21-27-000-002).
(4) Disconnect the lower end of the actuating cylinder (29) as follows:

CAUTION: WHEN YOU ATTACH THE ACTUATING CYLINDER, MAKE SURE THAT ITS RIGID PIPE IS NOT IN CONTACT WITH THE NLG BAY AROUND THE ATTACHMENT POINT.

(a) Remove and discard the cotter pin (22).
(b) Remove the nut (23), washer (24), bolt (28) and washer (27).
(c) Remove the bush (25).
(d) Remove the ring (26).
(e) Disconnect the spherical end of the actuating cylinder (29) and secure it with a cord to the NLG door hinge.
The actuating cylinder (29) must be tilted forward and to the right to prevent collision with the leg when it will be tilted.
(5) Disconnect the lower ends of the lock springs (31) and (32) (Ref. AMM TASK 32-21-18-000-001).

Subtask 32-21-13-020-060-B

B. Removal of the NLG Shock Absorber Assy

CAUTION: BEFORE YOU INSTALL THE STRAPS AND THEIR PROTECTION, MAKE SURE THAT THE PARTS ARE CLEAN AND DRY. THIS IS TO PREVENT ABRASIVE EFFECTS ON THE PAINT.

CAUTION: WHEN YOU INSTALL THE STRAPS, MAKE SURE THAT THERE IS A BLISTER PACK BETWEEN EACH STRAP AND THE PART. THIS IS TO PREVENT DAMAGE OR CHAFFING ON THE PAINT.

(1) Install the TROLLEY - LIFTING under the shock absorber (10).
(2) Make sure that the valve (1) is open.
(3) Fully compress the shock absorber (10).

NOTE: Some oil may bleed from the valve, connect it to a hose to collect it.

(4) Hold the shock absorber.

CAUTION: MAKE SURE THAT YOU INSTALL THE STRAP BETWEEN THE HYDRAULIC PIPE AND THE STEERING ACTUATOR, AND NOT ON TOP OF THE PIPE. THIS IS TO PREVENT DAMAGE TO THE PIPE.

CAUTION: WHEN YOU INSTALL THE STRAPS, MAKE SURE THAT THERE IS A BLISTER PACK BETWEEN EACH STRAP AND THE PART. THIS IS TO PREVENT DAMAGE OR CHAFFING ON THE PAINT.

(a) Place a 1500 mm (59.06 in.) STRAP-RATCHET between the towing bar (42) and the steering actuator (41) as close as possible of the barrel to hold the shock absorber (10), then hang moderately the strap.

NOTE: Position the strap near the barrel as much as possible to avoid side load to be transmitted to the steering actuator.

(5) Loosen the shock absorber nut.
(a) Remove the bolt (2) and washer (3).
(b) Cut and discard the lockwire.

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 Cut and discard the lockwire between the valve (1) and the stop plate (4).
(c) Remove the stop plate (4), then remove the valve (1).
(d) Loosen the nut (6) with the J47564 ADAPTOR but do not remove it.

NOTE: Make sure that it is possible to turn the nut (6) by hand, but do not remove it at this stage. There will not be enough space to use a wrench to remove it later.

(6) Install and close the valve (1).
(7) Installation of the strap

CAUTION: MAKE SURE THAT THERE IS A THIN, NON ABRASIVE FABRIC BETWEEN THE STRAP AND THE PART. THIS IS TO PREVENT DAMAGE OR CHAFFING ON THE PAINT.

CAUTION: BE CAREFUL NOT TO CAUSE DAMAGE TO THE PLASTIC OR METALLIC "0 POSITION" INDICATOR. IF NECESSARY, REMOVE THE INDICATOR.

(a) Put the 735 mm (28.94 in.) STRAP - LIFTING around the turning tube (43).
(8) Installation of the hoist and its strap

CAUTION: WHEN YOU INSTALL THE STRAPS, MAKE SURE THAT THERE IS A BLISTER PACK BETWEEN EACH STRAP AND THE PART. THIS IS TO PREVENT DAMAGE OR CHAFFING ON THE PAINT.

(a) Install the HOIST 500 KG (1100 LB) with the 500 mm (19.69 in.) STRAP - LIFTING on the center of the upper arm forestay (44).
(9) Securing the turning tube.

WARNING: MAKE SURE THAT THE STRAP BETWEEN THE TOWING BAR AND THE STEERING CYLINDER IS CORRECTLY ATTACHED AND SAFETIED. IF NOT, INJURY TO PERSONNEL AND DAMAGE TO EQUIPMENT CAN OCCUR.

WARNING: MAKE SURE THAT THE STRAP AROUND THE TURNING TUBE IS CORRECTLY ATTACHED AND SAFETIED WHEN YOU TILT THE NLG. IF NOT, INJURY TO PERSONNEL AND DAMAGE TO EQUIPMENT CAN OCCUR.

(a) Attach the hook of the HOIST - MINI to the strap around the turning tube (43).
(10) Remove the safety pin from the NLG lockstay assy (33).
(11) Disengage the NLG lockstay assy (33) by pushing the lower link assy (45) upwards by hand while operating the HOIST 500 KG (1100 LB) to tilt the NLG. Tilt the NLG until the free length in front of the jacking dome and in the NLG alignment is not less than 1700 mm (66.9292 in.).
(12) Remove the nut (6) and install the J47999 GUIDE CONE on the threaded part of the sliding tube.
(13) Removal of the shock absorber

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE NLG SHOCK ABSORBER. THE NLG SHOCK ABSORBER IS VERY HEAVY (AROUND 60KG), AND A MINIMUM OF THREE PERSONS IS NECESSARY TO MOVE IT. IF THE NLG SHOCK ABSORBER FALLS, IT CAN CAUSE INJURY TO PERSONNEL AND DAMAGE TO EQUIPMENT.

CAUTION: BE CAREFUL NOT TO HIT THE INNER PART OF THE SHOCK STRUT WITH THE SLIDING TUBE.

(a) Keep the shock absorber (10) in fully compressed position by hand (power of two persons needed) and remove the strap between the towing bar (42) and the steering actuator (41).
(b) Slowly remove the shock absorber (10) from the NLG leg.

NOTE: The shock absorber is close to disengage from the main fitting when about 1250 mm (49.2126 in.) of the chromium length is visible.

[Rev.10 from 2021] 2026.04.01 00:42:05 UTC