Installation of the MLG Lockstay Actuating Cylinder

TASK 32-11-21-400-001-A
Installation of the MLG Lockstay Actuating Cylinder

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 731
ZONE: 741

1. Reason for the Job
To install and test the MLG lockstay actuating cylinder with the aircraft lifted on jacks.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 4.5 and 2.9 m.N (39.82 and 25.66 lbf.in )
No specific	Torque wrench: range to between 13.5 and 11 m.N (119.47 and 97.35 lbf.in )
No specific	Torque wrench: range to between 20 and 17 m.N (14.75 and 12.54 lbf.ft )
No specific	Torque wrench: range to between 0.45 and 0.29 m.daN (39.82 and 25.66 lbf.in )
No specific	Torque wrench: range to between 1.35 and 1.1 m.daN (119.47 and 97.35 lbf.in )
No specific	Torque wrench: range to between 2.0 and 1.7 m.daN (14.75 and 12.54 lbf.ft )
460003180-51	1	RING-KEEP
460005171-95	1	POST-ASSEMBLY
460006437	1	TOOL-HOLDING

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.03GBB1)	Synthetic Oil base Grease-General Purpose Clay Thickened -
(Material No.03GCB1)	Synthetic Oil base Grease-Landing Gear Wheel Bearing Lithium Thickened -
(Material No.03HBD9)	Synthetic Ester base Grease-General Purpose Low Temp -
(Material No.06AAB1)	Polysulfide Sealant-General Purpose Fillet -
(Material No.06AAC5)	Polysulfide Sealant-General Purpose Interfay Landing Gear
(Material No.06ABF1)	Polysulfide Sealant-Fuel Tank Quick Curing -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
731	L.H MAIN GEAR
741	R.H MAIN GEAR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
10	COTTER PIN	AIPC 32-11-17-01-030
16	TAB WASHER	AIPC 32-11-18-02-050
17	WASHER	AIPC 32-11-18-02-050
3	PACKINGS	AIPC 32-11-22-01-050
2	BACK-UP PACKINGS	AIPC 32-11-22-01-060
3	PACKINGS	AIPC 32-11-85-89-050
2	BACK-UP PACKINGS	AIPC 32-11-85-89-060
10	COTTER PIN	AIPC 32-11-85-96-030
16	TAB WASHER	AIPC 32-11-85-98-050

E. Referenced Information

REFERENCE	DESIGNATION
TASK 07-11-00-581-001-A	Lifting for Aircraft Maintenance Operations
TASK 07-11-00-586-002-A	Lowering of the Aircraft for Maintenance Operations
TASK 12-22-32-640-001-A	Lubrication of Main Landing Gear and Doors
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 29-00-00-210-001-A	Check for Air in the Green/Blue/Yellow Hydraulic System
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 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 29-23-00-860-002-A	Connection 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 32-11-00-220-003-A	Detailed Dimensional Check of the MLG Lockstay Assembly
TASK 32-11-19-400-003-A	Connection of one end of the MLG Lock Springs to a MLG Side-Stay
TASK 32-31-00-720-002-A	Functional Test of the Normal Extension and Retraction of the Landing Gear
TASK 12-22-00-00	LUBRICATION - DESCRIPTION AND OPERATION
MLG Lockstay Actuating-Cylinder ** ON A/C NOT FOR ALL
MLG Lockstay Actuating-Cylinder ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 32-11-21-941-051-A

A. Safety Precautions
(1) Make sure that the SAFETY BARRIER(S) are in position.
(2) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On panel 400VU:

Make sure that the landing-gear control-lever 6GA is in the DOWN position
Make sure that a WARNING NOTICE(S) is in position to tell persons not to operate the landing gear.

(4) Make sure that the WARNING NOTICE(S) is in position to tell persons not to pressurize the Green Hydraulic system.

Subtask 32-11-21-860-051-A

B. Aircraft Maintenance Configuration
(1) Make sure that the aircraft is on jacks (Ref. AMM TASK 07-11-00-581-001).
(2) Make sure that the safety device is installed on the applicable MLG lockstay actuating cylinder (Ref. AMM TASK 32-00-00-481-001).
(3) Make sure that the applicable hydraulic systems are de-pressurized (Ref. AMM TASK 29-00-00-864-001).
(4) Make sure that the applicable hydraulic system reservoir is depressurized (Ref. AMM TASK 29-14-00-614-001).
(5) Make sure that the isolation coupling of the PTU is disconnected (Ref. AMM TASK 29-23-00-860-001).
(6) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below the applicable MLG lockstay actuating cylinder, at zone 731 or 741.

Subtask 32-11-21-869-054-A

C. Flight Configuration Precautions
(1) If you did not open the LGCIU circuit breakers, make sure that the electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).

Subtask 32-11-21-865-051-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

4. Procedure
Subtask 32-11-21-560-050-A ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the parts as follows:

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.

(a) Lubricate the pins (7) and (13), and the attachment lugs of the sidestay and the lockstay with:

Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) or Synthetic Oil base Grease-Landing Gear Wheel Bearing Lithium Thickened - (Material No.03GCB1) .

NOTE: For lubricant grease specification and lubrication requirements, refer to (Ref. AMM D/O 12-22-00-00).

(b) Lubricate the new AIPC 32-11-22-01-050 PACKINGS (3) and the new AIPC 32-11-22-01-060 BACK-UP PACKINGS (2) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .

Subtask 32-11-21-420-050-D ** ON A/C NOT FOR ALL

B. Installation of the MLG Lockstay Actuating Cylinder

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: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.

(1) Hold the actuating cylinder (12) in the correct position at the lockstay.
(2) Install the washers (11), the washer (6) and the pin (7). The washers (11) are installed one on each side of the actuating cylinder (12) eye-end.
(3) Align the other end of the actuating cylinder (12) and the washers (14) in the sidestay and install the pin (13). The washers (14) are installed one on each side of the actuating cylinder (12).
(4) Remove the PLUG-BLANKING from each disconnected line end.
(5) Use the 460005171-95 POST-ASSEMBLY to install the new packings (3) and the new back-up packings (2) on the hoses (1).
(6) Use the 460003180-51 RING-KEEP to set the back-up packings (2) and the packings (3) in the grooves on the hoses (1).
(7) Attach the hoses (1) to the actuating cylinder (12) with the bolts (5) and the washers (4).
(8) TORQUE the bolts (5) to between 4.5 and 2.9 m.N (39.82 and 25.66 lbf.in )

.
(9) Safety the bolts (5) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(10) Install the washer (8) and the nut (9).
(11) TORQUE the nut (9) to between 13.5 and 11 m.N (119.47 and 97.35 lbf.in )

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.

(12) Safety the nut (9) with the new AIPC 32-11-17-01-030 COTTER PIN (10).
(13) Install the sleeve (17), the new AIPC 32-11-18-02-050 WASHER (17) and the bolt (15).
(14) Use the 460006437 TOOL-HOLDING to hold the pin (13) and TORQUE the bolt (15) to between 20 and 17 m.N (14.75 and 12.54 lbf.ft )

.
(15) Bend the tabs of the tab washer (16) to safety the bolt (15).
(16) Connect the end of the MLG lock springs to the MLG side-stay (Ref. AMM TASK 32-11-19-400-003).
(17) Do the dimensional check on the lockstay actuator and the lockstay center-joint (Ref. AMM TASK 32-11-00-220-003).
(18) Lubricate the greasers on the actuating cylinder (12) (Ref. AMM TASK 12-22-32-640-001).
(19) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) or Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) or Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) to:

Heads of the bolts (5) and (15)
The nut (9)
The cotter pin (10).

Subtask 32-11-21-560-050-B ** ON A/C NOT FOR ALL

C. Preparation for Installation

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.

(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the parts as follows:
(a) Apply Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) to the external diameter of the pins (7) and (13).
(b) Lubricate the new AIPC 32-11-22-01-050 PACKINGS (3) or AIPC 32-11-85-89-050 PACKINGS (3) and the new AIPC 32-11-22-01-060 BACK-UP PACKINGS (2) or AIPC 32-11-85-89-060 BACK-UP PACKINGS (2) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .

Subtask 32-11-21-420-050-B ** ON A/C NOT FOR ALL

D. Installation of the MLG Lockstay Actuating Cylinder

CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.

(1) Hold the actuating cylinder (12) in the correct position at the lockstay and install the pin (7), the washer (6) and the washers (11). The washers (11) are installed one on each side of the actuating cylinder (12) eye-end.
(2) Align the other end of the actuating cylinder (12) in the sidestay and install the pin (13).
(3) Install the washers (14), one on each side of the actuating cylinder (12).
(4) Remove the blanking plugs from the hoses (1).
(5) Use the 460005171-95 POST-ASSEMBLY to install the new packings (3) and the new back-up packings (2) on the hoses (1).
(6) Use the 460003180-51 RING-KEEP to set the back-up packings (2) and the packings (3) in the grooves on the hoses (1).
(7) Attach the hoses (1) to the actuating cylinder (12) with the bolts (5) and the washers (4).
(8) TORQUE the bolts (5) to between 0.45 and 0.29 m.daN (39.82 and 25.66 lbf.in )

.
(9) Safety the bolts (5) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(10) Install the washer (8) and the nut (9).
(11) TORQUE the nut (9) to between 1.35 and 1.1 m.daN (119.47 and 97.35 lbf.in )

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.

(12) Safety the nut (9) with the new AIPC 32-11-17-01-030 COTTER PIN (10) or AIPC 32-11-85-96-030 COTTER PIN (10).
(13) Install the sleeve (17), the new AIPC 32-11-18-02-050 TAB WASHER (16) or AIPC 32-11-85-98-050 TAB WASHER (16) and the bolt (15).
(14) Use the 460006437 TOOL-HOLDING to hold the pin (13) and TORQUE the bolt (15) to between 2.0 and 1.7 m.daN (14.75 and 12.54 lbf.ft )

The heads of the bolts (5) and (15)
The nut (9)
Fill the hole in the lockstay on top of the bolt (15).

Subtask 32-11-21-560-050-C ** ON A/C NOT FOR ALL

E. Preparation for Installation
(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the parts as follows:

CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.

(a) Apply Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) to the external diameter of the pins (7) and (13).
(b) Lubricate the new AIPC 32-11-22-01-050 PACKINGS (3) or AIPC 32-11-85-89-050 PACKINGS (3) and the new AIPC 32-11-22-01-060 BACK-UP PACKINGS (2) or AIPC 32-11-85-89-060 BACK-UP PACKINGS (2) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .

Subtask 32-11-21-420-050-C ** ON A/C NOT FOR ALL

F. Installation of the MLG Lockstay Actuating Cylinder

CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.

(1) Hold the actuating cylinder (12) in the correct position at the lockstay.
(2) Install the washers (11), the washer (6) and the pin (7). The washers (11) are installed one on each side of the actuating cylinder (12) eye-end.
(3) Align the other end of the actuating cylinder (12) and the washers (14) in the sidestay and install the pin (13). The washers (14) are installed one on each side of the actuating cylinder (12).
(4) Remove the blanking plugs from the hoses (1).
(5) Use the 460005171-95 POST-ASSEMBLY to install the new packings (3) and the new back-up packings (2) on the hoses (1).
(6) Use the 460003180-51 RING-KEEP to set the back-up packings (2) and the packings (3) in the grooves on the hoses (1).
(7) Attach the hoses (1) to the actuating cylinder (12) with the bolts (5) and the washers (4).
(8) TORQUE the bolts (5) to between 0.45 and 0.29 m.daN (39.82 and 25.66 lbf.in )

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.

The head of the bolts (5)
The nut (9)
Fill the hole in the lockstay on top of the bolt (15).

Subtask 32-11-21-860-052-A

G. Aircraft Maintenance Configuration
(1) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).

Subtask 32-11-21-942-050-A

H. Removal of Equipment
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).
(3) Make sure that the work area is clean and clear of tools and other items.

Subtask 32-11-21-614-052-A

I. Pressurize the Hydraulic System

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.

(1) Pressurize the Green Hydraulic-system reservoir (Ref. AMM TASK 29-14-00-614-002).

Subtask 32-11-21-865-052-A

J. Remove the safety clip(s) and the tag(s) and close 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 32-11-21-720-050-A

K. Test
(1) Do a functional test of the applicable MLG (Ref. AMM TASK 32-31-00-720-002).
(2) Do a check for air in the Green Hydraulic-system (Ref. AMM TASK 29-00-00-210-001).

5. Close-up
Subtask 32-11-21-481-050-A

A. Installation of the Safety Equipment
(1) If necessary, install the safety device on the applicable MLG lockstay actuating cylinder (Ref. AMM TASK 32-00-00-481-001).

Subtask 32-11-21-582-051-A

B. Lower the Aircraft
(1) Lower the aircraft off jacks (Ref. AMM TASK 07-11-00-586-002).

Subtask 32-11-21-942-051-A

C. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the SAFETY BARRIER(S).
(3) Remove the WARNING NOTICE(S).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:40:44 UTC