Removal of the Bearing Seals of the MLG Actuator Bearing Assembly

TASK 57-26-13-000-004-A
Removal of the Bearing Seals of the MLG Actuator Bearing Assembly

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: 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.

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 07-11-00-581-001-A	Lifting for Aircraft Maintenance Operations
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 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
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 32-31-46-000-001-A	Removal of the MLG Actuating Cylinder
TASK 57-26-13-000-002-A	Removal of the Bearing Assembly of the MLG Actuator Attachment
Bearing Seals - MLG Actuator Bearing Assembly

3. Job Set-up
Subtask 57-26-13-941-055-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Install the safety devices on the landing gears (Ref. AMM TASK 32-00-00-481-001) and the landing gear doors (Ref. AMM TASK 32-00-00-481-002).
(3) On the 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) Put a WARNING NOTICE(S) to tell persons not to pressurize the Green hydraulic system.

Subtask 57-26-13-582-050-A

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

Subtask 57-26-13-860-055-A

C. Aircraft Maintenance Configuration
(1) Make sure that the Yellow and Green hydraulic systems are de-pressurized (Ref. AMM TASK 29-00-00-864-001).
(2) Disconnect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-001).

Subtask 57-26-13-869-052-A

D. Flight Configuration Precautions
(1) If the electrical power is not necessary for other maintenance tasks, de-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002). Then, it is not necessary to operate the LGCIU circuit breakers.
(2) If the electrical power is necessary, do the precautions for flight configuration (Ref. AMM TASK 32-00-00-860-001) before you open the LGCIU circuit breakers.

Subtask 57-26-13-865-050-A

E. 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

Subtask 57-26-13-010-054-A

F. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT) in position below the applicable main landing gear bay, zone 571 or 671.
(2) Remove the applicable MLG actuating cylinder (Ref. AMM TASK 32-31-46-000-001).
(3) Remove the applicable MLG actuator attachment bearing assembly (Ref. AMM TASK 57-26-13-000-002) .

4. Procedure
Subtask 57-26-13-020-054-B

A. Removal of the Bearing Seals
(1) Remove the bearing-halves (1) from the bearing ball (2) as follows:
(a) Hold the applicable bearing-half (1) tightly.

NOTE: Separation of the bearing-halves (1) from the bearing ball (2) is not easy.

(b) Carefully remove the bearing-halves (1) from the bearing ball (2).
(c) Make sure that the distance between the bearing-halves (1) is constant during separation.
(2) Remove and discard the seal (3) and the seal (4).
(3) Remove the bearing ball (2).
(4) Remove and discard the dowel pins (5) from the bearing-halves (1).

[Rev.10 from 2021] 2026.04.01 02:11:40 UTC