Removal of the MLG Lockstay Actuating-Cylinder

TASK 32-11-21-000-001-A-02
Removal of the MLG Lockstay Actuating-Cylinder

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.

1. Reason for the Job
To remove the MLG lockstay actuating cylinder with the lockstay brace tool (DRT68864) installed. It is not necessary to lift the aircraft on jacks.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	1	CONTAINER 1 L (1/4 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
DRT68864	1	LOCK, STAY BRACE TOOL

B. Referenced Information

REFERENCE	DESIGNATION
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 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 32-00-00-480-001-A	Installation of the Brace Tool on the Lockstay Actuator
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
MLG Lockstay Actuating-Cylinder

3. Job Set-up
Subtask 32-11-21-941-054-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Make sure that the ground safety locks are installed on the landing gear and the landing gear doors (Ref. AMM TASK 32-00-00-481-001) and (Ref. AMM TASK 32-00-00-481-002).
(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) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the Green or Yellow hydraulic system.

Subtask 32-11-21-860-056-A

B. Aircraft Maintenance Configuration
(1) Disconnect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-001).
(2) Make sure that the Yellow and Green hydraulic systems are depressurized (Ref. AMM TASK 29-00-00-864-001).
(3) Make sure that the applicable hydraulic system reservoir is depressurized (Ref. AMM TASK 29-14-00-614-001).

Subtask 32-11-21-869-057-A

C. 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 32-11-21-865-056-A

D. 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
** 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 32-11-21-010-052-A

E. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable MLG lockstay actuating cylinder, at zone 731 or 741.
(2) Put a CONTAINER 1 L (1/4 USGAL) below the applicable actuating cylinder.

4. Procedure
Subtask 32-11-21-020-053-A

A. Removal of the MLG Lockstay Actuating-Cylinder
(1) Install the DRT68864 LOCK, STAY BRACE TOOL (Ref. AMM TASK 32-00-00-480-001).

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.

CAUTION: DURING REMOVAL OF THE LOCKSTAY ACTUATOR HOSES, MAKE SURE THAT YOU DO NOT LOOSEN THE SWAGED FITTINGS OF THE HOSES. IF YOU DO NOT OBEY THIS INSTRUCTION, RUPTURE OF THE LOCKSTAY ACTUATOR HOSES CAN OCCUR.

(2) Remove and discard the lockwire from the bolts (5).
(3) Remove the bolts (5) and the washers (4) from the hoses (1).
(4) Move the hoses (1) away from the actuating cylinder (6). Remove and discard the packings (3) and the back-up packings (2).
(5) Put the PLUG-BLANKING in each disconnected line end.
(6) Release and open the clamps (8) on support-arms (9) and (10).
(7) Remove the actuating cylinder (6) (weight 3.3 kg (7.3 lb)) from the DRT68864 LOCK, STAY BRACE TOOL (7).

[Rev.10 from 2021] 2026.04.01 00:40:42 UTC