Removal of the MLG Actuating Cylinder Wing-End Pin

TASK 32-31-46-000-003-A
Removal of the MLG Actuating Cylinder Wing-End Pin

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: OBEY THE HYDRAULIC SAFETY PROCEDURES. WORK ON THE HYDRAULIC SYSTEMS CAN BE DANGEROUS.

ZONE: 571
ZONE: 671

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 3M (10 FT)- ADJUSTABLE
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
571	MLG BAY
671	MLG BAY

C. 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 32-00-00-481-001-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 32-12-00-010-001-A	Open the Main Gear Doors for Access
Overwing Panel Cover-Plate
MLG Actuating Cylinder Wing-End Pin - Location and Detail ** ON A/C NOT FOR ALL
MLG Actuating Cylinder Wing-End Pin - Location and Detail ** ON A/C NOT FOR ALL
MLG Actuating Cylinder Wing-End Pin - Location and Detail ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 32-31-46-941-056-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
(3) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(4) 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.

(5) Put WARNING NOTICE(S) to tell persons not to pressurize the hydraulic systems:

In the cockpit, on the HYD overhead panel 40VU
On the hydraulic ground service-panels 197CB and 198CB
On the access door 195BB.

Subtask 32-31-46-869-058-A

B. 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 circuit breakers.

Subtask 32-31-46-865-055-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
** 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 32-31-46-860-058-A

D. Aircraft Maintenance Configuration
(1) Disconnect the isolation coupling of the power transfer unit (Ref. AMM TASK 29-23-00-860-001).
(2) Depressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-00-00-864-001).
(3) Depressurize the applicable hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-001).

Subtask 32-31-46-010-054-B

E. Get Access

Overwing Panel Cover-Plate

(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position:
(a) FOR [2503GM] (ACTG CYL-MLG, L)

Below zone 571.

(b) FOR [2504GM] (ACTG CYL-MLG, R)

Below zone 671.

(2) Remove the cover plates (13) and (14) as follows:

WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.

(a) Remove and discard the cotter pins (19) and (20).
(b) Remove the nuts (17) and (18) and the bridge plates (15) and (16).
(c) Remove the cover plates (13) and (14).

4. Procedure
Subtask 32-31-46-020-052-C ** ON A/C NOT FOR ALL

A. Removal of the MLG Actuating Cylinder Wing-End Pin
(1) Disconnect the hydraulic hoses from the actuating cylinder.
(2) Put the PLUG-BLANKING in each disconnected line end.
(3) Attach the hydraulic hoses to the adjacent structure. Do not make kinks in the hydraulic hoses.
(4) Remove and discard the cotter pin (2).
(5) Remove the nut (3), the washer (4), the nylon-washer (5), the bolt (6) and the collar (7).
(6) Remove the pin (1) from the actuating cylinder and the the wing mounting lug.

Subtask 32-31-46-020-052-D ** ON A/C NOT FOR ALL

Nut (3)
Washer (4)
Washer (5), if installed
Nylon-washer (6)
Washer (7), if installed
Bolt (8)
Collar (9).

(6) Remove the pin (1) from the actuating cylinder and the wing mounting lug.

Subtask 32-31-46-020-052-E ** ON A/C NOT FOR ALL

A. Removal of the MLG Actuating Cylinder Wing-End Pin hydraulic hoses.
(1) Disconnect the hydraulic hoses from the actuating cylinder.
(2) Put the PLUG-BLANKING in each disconnected line end.
(3) Attach the hydraulic hoses to the adjacent structure. Do not make kinks in the hydraulic hoses.
(4) Remove and discard the cotter pin (7).
(5) Remove the:

Nut (6)
Washer (5)
Nylon-washer (4)
Bolt (2)
Collar (3).

(6) Remove the pin (1) from the actuating cylinder and the wing mounting lug.

[Rev.10 from 2021] 2026.04.01 00:45:36 UTC