Installation of the MLG Uplock Pin

TASK 32-11-11-400-003-A
Installation of the MLG Uplock 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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to 1.6 m.daN (11.80 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06AAB1)	Polysulfide Sealant-General Purpose Fillet -
(Material No.06LDG2)	Non Hardening Jointing Putty-High Temp. Area - Structure
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
6	COTTER PINS	AIPC 32-11-11-82-170

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-720-005-A	Check of the Electrical Bonding of the Different Components (but not the Fluid Systems and Components Installed on Composite materials)
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 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 32-00-00-860-001-A	Flight Configuration Precautions with Electrical Power
TASK 32-00-00-860-001-A-01	Flight Configuration Precautions without Electrical Power
TASK 32-00-00-860-002-A	Ground Configuration after Flight Configuration with Electrical Power
TASK 32-00-00-860-002-A-01	Ground Configuration after Flight Configuration without Electrical Power
TASK 32-31-00-820-003-A	Adjustment of the MLG Uplock
MLG Leg Uplock Pin - Location and Detail

3. Job Set-up
Subtask 32-11-11-941-062-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure the SAFETY BARRIER(S) are in position.
(2) On panel 400VU:

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

(3) Make sure that a WARNING NOTICE(S) is in the cockpit to tell persons not to pressurize the Green hydraulic system.
(4) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).

Subtask 32-11-11-860-070-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) If applicable, make sure that the flight configurations were obeyed (Ref. AMM TASK 32-00-00-860-001).
(2) Make sure that the Green and Yellow hydraulic systems are depressurized.
(Ref. AMM TASK 29-00-00-864-001).
(3) If applicable, make sure that the isolation coupling on the PTU is disconnected (Ref. AMM TASK 29-23-00-860-001).
(4) Make sure that the access platform is in position below the applicable zone 731(741).

Subtask 32-11-11-865-064-A ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32

4. Procedure
Subtask 32-11-11-420-079-A ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Use a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the components and component interface.
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Apply Non Hardening Jointing Putty-High Temp. Area - Structure (Material No.06LDG2) to:

the interface of the uplock pin assembly and the MLG attachment lugs
the shanks (but not the threads) of the bolts (1)
the shank (but not the thread) of the static discharge connector (2)
the washers (4).

Subtask 32-11-11-420-080-A ** ON A/C NOT FOR ALL

B. Installation of the MLG Uplock Pin
(1) Put the uplock pin (3) in position on the MLG attachment lugs.
(2) Install the bolts (1), the static discharge connector (2), the washers (4) and the nuts (5).
(3) TORQUE tighten the nuts (5) to 1.6 m.daN (11.80 lbf.ft )

.
(4) Loosen the nuts (5).
(5) Do steps (3) and (4) two more times.
(6) TORQUE tighten the nuts (5) to 1.6 m.daN (11.80 lbf.ft )

.
(7) If the cotter pin holes are not aligned, tighten the applicable nut(s) (5) until the subsequent slot in the nut aligns with the hole.
(8) Install the new AIPC 32-11-11-82-170 COTTER PINS (6).
(9) Do an electrical bonding test between the MLG pintle pin bearing and the static discharge connector (2) (Ref. AMM TASK 20-28-00-720-005):
(a) Make sure that the bonding resistance value is no more than 10 milliohms.

NOTE: If the uplock pin (3) is replaced because of damage or the uplock position is possibly incorrect, check the uplock adjustment (Ref. AMM TASK 32-31-00-820-003).

Subtask 32-11-11-390-050-A ** ON A/C NOT FOR ALL

C. Sealant
(1) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to:

the area around the interface between the uplock pin assembly and the MLG attachment lugs
the heads of the bolts (1)
the washers (4)
the nuts (5).

Subtask 32-11-11-865-065-A ** ON A/C NOT FOR ALL

D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32

Subtask 32-11-11-860-071-A ** ON A/C NOT FOR ALL

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

CAUTION: YOU MUST CLOSE THE CIRCUIT BREAKERS OPENED FOR AIRCRAFT FLIGHT CONFIGURATION WHEN THE MAINTENANCE WORK IS COMPLETED. DAMAGE TO THE AIRCRAFT CAN OCCUR IF THEY STAY OPEN.

(2) If the flight configuration precautions were obeyed, put the aircraft into the ground configuration (Ref. AMM TASK 32-00-00-860-002).

5. Close-up
Subtask 32-11-11-942-061-A ** ON A/C NOT FOR ALL

A. Removal of Equipment
(1) Remove the SAFETY BARRIER(S).
(2) Remove the WARNING NOTICE(S).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:39:55 UTC