Installation of the MLG Door Uplock

TASK 32-31-33-400-002-A
Installation of the MLG Door Uplock

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

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.

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

ZONE: 734
ZONE: 744
FIN: 2520GM
FIN: 2521GM

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 2M (6 FT) - ADJUSTABLE
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	2	WARNING NOTICE(S)
No specific	Torque wrench: range to between 5.61 and 4.59 m.N (49.65 and 40.62 lbf.in )
No specific	Torque wrench: range to between 5.33 and 4.83 m.N (47.17 and 42.74 lbf.in )
No specific	Torque wrench: range to between 5.34 and 4.83 m.N (47.26 and 42.74 lbf.in )
No specific	Torque wrench: range to between 5.65 and 5.08 m.N (50 and 45 lbf.in )
No specific	Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )
FOR [2520GM] (UPLOCK ASSY-MLG DOOR, R)
98DNSA20208040	1	RIGGING PIN
98DNSA20208060	1	RIGGING PIN
FOR [2521GM] (UPLOCK ASSY-MLG DOOR, L)
98DNSA20208040	1	RIGGING PIN
98DNSA20208060	1	RIGGING PIN

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06LCG9)	Non Hardening Jointing Putty-Medium Temp. Area - -
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
734	MAIN DOOR
744	MAIN DOOR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
43	COTTER PIN	AIPC 32-31-03-24-030
44	COTTER PIN	AIPC 32-31-03-24-030
53	COTTER PIN	AIPC 32-31-03-24-030
54	COTTER PIN	AIPC 32-31-03-24-030
12	COTTER PINS	AIPC 32-31-03-24-220
17	COTTER PIN	AIPC 32-31-03-50-270
42	NUTS	AIPC 32-31-33-01-200
43	COTTER PIN	AIPC 32-31-83-44-030
44	COTTER PIN	AIPC 32-31-83-44-030
53	COTTER PIN	AIPC 32-31-83-44-030
54	COTTER PIN	AIPC 32-31-83-44-030
12	COTTER PINS	AIPC 32-31-83-44-220
17	COTTER PIN	AIPC 32-31-83-46-010
26	COTTER PIN	AIPC 32-33-03-01-170
26	COTTER PIN	AIPC 32-33-83-01-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 20-28-00-912-803-A	Bonding Surface Preparation
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-10-00-863-001-A	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
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 29-23-00-860-002-A	Connection of the Isolation Coupling of the Power Transfer Unit (PTU)
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 32-00-00-860-002-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 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
TASK 32-31-00-710-002-A	Operational Test of the Landing Gear Doors (With False Targets)
TASK 32-31-00-710-002-A-01	Operational Test of the Landing Gear Doors (Without False Targets)
TASK 32-33-00-710-001-A	Operational Check of Free-Fall Mechanical Control
TASK 51-75-13-916-002-A	Repair to a layer of Corrosion Preventive Compound
Levers of the MLG Door Uplock ** ON A/C NOT FOR ALL
Levers of the MLG Door Uplock ** ON A/C NOT FOR ALL
MLG Door Uplock ** ON A/C NOT FOR ALL
MLG Door Uplock ** ON A/C NOT FOR ALL
Rigging of the MLG Door Uplocks ** ON A/C NOT FOR ALL
Rigging of the MLG Door Uplocks ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 32-31-33-860-052-A

A. Aircraft Maintenance Configuration
(1) Make sure that the PTU isolation coupling is disconnected (Ref. AMM TASK 29-23-00-860-001).
(2) Make sure that the Green hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-001).
(3) Make sure that the flight configuration precautions were obeyed (Ref. AMM TASK 32-00-00-860-001).
(4) Make sure that the applicable MLG doors are open (Ref. AMM TASK 32-12-00-010-001).
(5) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.

Subtask 32-31-33-865-055-A

B. 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
49VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	H12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	R35
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
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	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33
121VU	LGCIU/BAT SPLY/SYS2	59GA	R32
121VU	LGCIU/BAT SPLY/SYS1	58GA	R31

Subtask 32-31-33-941-051-A

C. Safety Precautions
(1) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Green hydraulic system:

On panel 40VU in the cockpit
On the ground service panel of the Green hydraulic system.

(2) Make sure that the hydraulic safety procedures were obeyed (Ref. AMM TASK 29-00-00-910-002).
(3) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the MLG door uplock to collect the hydraulic fluid leakage.

Subtask 32-31-33-560-050-A ** ON A/C NOT FOR ALL

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.

D. Preparation of the Replacement Component

Levers of the MLG Door Uplock ** ON A/C NOT FOR ALL

(1) If you will install a replacement MLG door uplock (4), do the steps that follow:
(a) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the splines of the levers (16) and (22), the bolts (40) and (47) and the splines of the replacement MLG door uplock (4).
(b) Align the master splines and install the lever (16) on the splined shaft of the replacement MLG door uplock (4).
(c) Install the bolt (47), the washer (46) and the nut (45).
(d) Tighten the nut (45).
(e) Safety the nut (45) with the new AIPC 32-31-03-24-030 COTTER PIN (44) or AIPC 32-31-83-44-030 COTTER PIN (44).
(f) Align the master splines and install the lever (22) on the splined shaft of the replacement MLG door uplock (4).
(g) Install the bolt (40), the washer (41) and the nut (42).
(h) Tighten the nut (42).
(i) Safety the nut (42) with the new AIPC 32-31-03-24-030 COTTER PIN (43) or AIPC 32-31-83-44-030 COTTER PIN (43).
(j) Apply the corrosion preventive compound to the nuts (42) and (45), the bolts (40) and (47) and the adjacent areas (Ref. AMM TASK 51-75-13-916-002).

Subtask 32-31-33-560-050-B ** ON A/C NOT FOR ALL

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.

D. Preparation of the Replacement Component

Levers of the MLG Door Uplock ** ON A/C NOT FOR ALL

(1) If you will install a replacement MLG door uplock (4), do the steps that follow:
(a) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the splines of the levers (16) and (22), the bolts (50) and (57) and the splines of the replacement MLG door uplock (4).
(b) Align the master splines and install the lever (16) on the splined shaft of the replacement MLG door uplock (4).
(c) Install the bolt (57), the washer (56) and the nut (55).
(d) Tighten the nut (55).
(e) Safety the nut (55) with the new AIPC 32-31-03-24-030 COTTER PIN (54) or AIPC 32-31-83-44-030 COTTER PIN (54).
(f) Align the master splines and install the lever (22) on the splined shaft of the replacement MLG door uplock (4).
(g) Install the bolt (50), the washer (51) and the nut (52).
(h) Tighten the nut (52).
(i) Safety the nut (52) with the new AIPC 32-31-03-24-030 COTTER PIN (53) or AIPC 32-31-83-44-030 COTTER PIN (53).
(j) Apply the corrosion preventive compound to the nuts (52) and (55), the bolts (50) and (57) and the adjacent areas (Ref. AMM TASK 51-75-13-916-002).

Subtask 32-31-33-160-050-A

E. Preparation for Installation

MLG Door Uplock ** ON A/C NOT FOR ALL

(1) Clean the mating surfaces with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) and dry them with filtered compressed air.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the bolts (2) and the bushes (1).

4. Procedure
Subtask 32-31-33-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the MLG Door Uplock

MLG Door Uplock ** ON A/C NOT FOR ALL

(1) Do the steps that follow:
(a) Attach the switch brackets (32) to the proximity sensors (30) with the washers (36), cap screws (35) and nuts (39).
(b) TORQUE the cap screws (35) to between 5.61 and 4.59 m.N (49.65 and 40.62 lbf.in )

.
(c) Put the switch brackets (32) together with the proximity sensors (30) and the shims (31) in the position identified during the removal procedure.
(d) Install the washers (33) and the cap screws (34).
(e) TORQUE the cap screws (34) to between 5.65 and 5.08 m.N (50 and 45 lbf.in )

.
(2) Put the MLG door uplock (4) in position.
(3) Install the bushes (1), the bolts (2), the washers (11) and the nuts (13).
(4) Tighten the nuts (13).

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.

(5) Safety the nuts (13) with the new AIPC 32-31-03-24-220 COTTER PINS (12) or AIPC 32-31-83-44-220 COTTER PINS (12).
(6) Remove the PLUG-BLANKING from each disconnected line end.
(7) Connect the unions (3) and (10) to the hydraulic connectors of the MLG door uplock (4).
(8) TORQUE the unions (3) and (10) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

.
(9) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).
(10) Remove the CAP-BLANKING from each electrical connector and receptacle.
(11) Make sure that all the electrical connections are clean and in the correct condition.
(12) Connect the electrical connectors (37) and (38) to the proximity sensors (30).

Subtask 32-31-33-420-051-B ** ON A/C NOT FOR ALL

A. Installation of the MLG Door Uplock

MLG Door Uplock ** ON A/C NOT FOR ALL

(1) Do the steps that follow:
(a) Attach the switch brackets (36) and (37) to the proximity sensors (30) with the washers (35), cap screws (34) and new AIPC 32-31-33-01-200 NUTS (42).
(b) TORQUE the cap screws (34) to between 5.33 and 4.83 m.N (47.17 and 42.74 lbf.in )

.
(c) Put the switch brackets (36) and (37) together with the proximity sensors (30) and the shims (31) in the position identified during the removal procedure.
(d) Install the washers (32) and the cap screws (33).
(e) TORQUE the cap screws (33) to between 5.65 and 5.08 m.N (50.0 and 45.0 lbf.in )

.
(f) Measure the clearance between the switch brackets (36) and (37). Calculate the quantity of the shim(s) (47) to get 0 -0.05 mm or +0.05 mm (0 -0.0020 in. or +0.0020 in.) of this measured clearance.
(g) Put the calculated quantity of the shim(s) (47) in position between the switch brackets (36) and (37).
(h) Install the cap screw (48), the washer (46) and the nut (45).
(i) TORQUE the nut (45) to between 5.33 and 4.83 m.N (47.17 and 42.74 lbf.in )

.
(2) Put the MLG door uplock (4) in position.
(3) Install the bushes (1), the bolts (2), the washers (11) and the nuts (13).
(4) Tighten the nuts (13).

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.

.
(9) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).
(10) Put the clamp blocks (38) and the electrical connectors (40) and (41) in position.
(11) Remove the CAP-BLANKING from each electrical connector and receptacle.
(12) Make sure that all the electrical connections are clean and in the correct condition.
(13) Connect the electrical connectors (40) and (41) to the proximity sensors (30).
(14) Install the cap screws (39), the washers (43) and the nuts (44). Do not tighten the nuts (44) at this step.
(15) Apply pressure on the clamp blocks (38) and make sure that the electrical connectors (40) and (41) do not move.
(16) TORQUE the nuts (44) to between 5.34 and 4.83 m.N (47.26 and 42.74 lbf.in )

Subtask 32-31-33-480-050-A

B. Installation of the Rigging Pins

Rigging of the MLG Door Uplocks ** ON A/C NOT FOR ALL

(1) Safety Precaution

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.

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.

(a) Install the safety devices on the landing gear doors (Ref. AMM TASK 32-00-00-481-002).
(2) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001).
(3) Close circuit breaker 1GA.
(4) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(5) Move the MLG ground door-opening handle from the OPEN to the CLOSED position.

NOTE: This is necessary to install the rigging pins.

(6) Depressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-864-001).
(7) Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001).
(8) Open circuit breaker 1GA.
(9) Put the rigging pins in position:
(a) FOR [2521GM] (UPLOCK ASSY-MLG DOOR, L)

Put the 98DNSA20208060 RIGGING PIN through the lever into the forward face of MLG door uplock 2521GM
Put the 98DNSA20208040 RIGGING PIN through the lever into the aft face of MLG door uplock 2521GM
Put the 98DNSA20208040 RIGGING PIN through the lever into the forward face of MLG vent valve 2516GM
Put the 98DNSA20208040 RIGGING PIN through the lever into the aft face of door by-pass valve 2517GM.

(b) FOR [2520GM] (UPLOCK ASSY-MLG DOOR, R)

Put the 98DNSA20208060 RIGGING PIN through the lever into the forward face of MLG door uplock 2520GM
Put the 98DNSA20208040 RIGGING PIN through the lever into the aft face of MLG door uplock 2520GM
Put the 98DNSA20208060 RIGGING PIN through the lever into the forward face of cutout valve 2515GM
Put the 98DNSA20208040 RIGGING PIN through the lever into the aft face of door by-pass valve 2518GM.

Subtask 32-31-33-820-050-A ** ON A/C NOT FOR ALL

C. Adjustment of the MLG Door Uplock

MLG Door Uplock ** ON A/C NOT FOR ALL

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.

(1) Put the disconnected end of the control rod (15) between the forks of the lever (16) and make sure that the holes are aligned.
(a) If necessary, adjust the control rod (15) as follows:
1 Remove and discard the lockwire from the locknuts (14) at each end of the control rod (15).
2 Loosen the locknuts (14).
3 Turn the control rod (15) until the holes are aligned.
4 Tighten the locknuts (14).
5 Make sure that the threads at each end of the control rod (15) are in the correct condition.
6 Safety the locknuts (14) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(2) Put the disconnected end of the control rod (28) between the forks of the lever (22) and make sure that the holes are aligned.
(a) If necessary, adjust the control rod (28) as follows:
1 Remove and discard the lockwire from the locknuts (27) at each end of the control rod (28).
2 Loosen the locknuts (27).
3 Turn the control rod (28) until the holes are aligned.
4 Tighten the locknuts (27).
5 Make sure that the threads at each end of the control rod (28) are in the correct condition.
6 Safety the locknuts (27) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.

Subtask 32-31-33-420-054-A ** ON A/C NOT FOR ALL

D. Installation of the Control Rods

MLG Door Uplock ** ON A/C NOT FOR ALL

(1) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the bolts (23) and (20) and the bushes (29) and (21).
(2) Put the control rod (28) in position.
(3) Install the bush (29), the bolt (23), the washer (24) and the nut (25).
(4) Tighten the nut (25).
(5) Safety the nut (25) with the new AIPC 32-33-03-01-170 COTTER PIN (26) or AIPC 32-33-83-01-020 COTTER PIN (26).
(6) Put the control rod (15) in position.
(7) Install the bush (21), the bolt (20), the washer (19) and the nut (18).
(8) Tighten the nut (18).
(9) Safety the nut (18) with the new AIPC 32-31-03-50-270 COTTER PIN (17) or AIPC 32-31-83-46-010 COTTER PIN (17).
(10) Install the bonding strap (7) as follows:
(a) Cut, remove and discard the tie-wrap.
(b) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).
(c) Install the bonding strap (7), the washers (6) and (8), the bolt (9) and the nut (5).
(d) Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
(e) Tighten the nut (5).

Subtask 32-31-33-820-050-B ** ON A/C NOT FOR ALL

E. Adjustment of the MLG Door Uplock

MLG Door Uplock ** ON A/C NOT FOR ALL

(1) Put the disconnected end of the control rod (15) between the forks of the lever (16) and make sure that the holes are aligned.
(a) If necessary, adjust the control rod (15) as follows:
1 Remove and discard the lockwire from the locknuts (14) at each end of the control rod (15).
2 Loosen the locknuts (14).
3 Turn the control rod (15) until the holes are aligned.
4 Tighten the locknuts (14).
5 Make sure that the threads at each end of the control rod (15) are in the correct condition.
6 Safety the locknuts (14) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(2) Put the disconnected end of the control rod (28) between the forks of the lever (22) and make sure that the holes are aligned.
(a) If necessary, adjust the disconnected end of the control rod (28) as follows:
1 Remove and discard the lockwire from the locknuts (27) at each end of the control rod (28).
2 Loosen the locknuts (27).
3 Turn the control rod (28) until the holes are aligned.
4 Tighten the locknuts (27).
5 Make sure that the threads at each end of the control rod (28) are in the correct condition.
6 Safety the locknuts (27) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.

Subtask 32-31-33-420-054-B ** ON A/C NOT FOR ALL

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.

F. Installation of the Control Rods

Levers of the MLG Door Uplock ** ON A/C NOT FOR ALL

Subtask 32-31-33-080-050-A

G. Removal of the Rigging Pins

Rigging of the MLG Door Uplocks ** ON A/C NOT FOR ALL

(1) Remove the rigging pins from:
(a) FOR [2521GM] (UPLOCK ASSY-MLG DOOR, L)

The forward face of the MLG door uplock 2521GM
The aft face of the MLG door uplock 2521GM
The forward face of the MLG vent valve 2516GM
The aft face of the door by-pass valve 2517GM.

(b) FOR [2520GM] (UPLOCK ASSY-MLG DOOR, R)

The forward face of the MLG door uplock 2520GM
The aft face of the MLG door uplock 2520GM
The forward face of the cutout valve 2515GM
The aft face of the door by-pass valve 2518GM.

(2) Move the MLG ground door-opening handle from the CLOSED to the OPEN position.

Subtask 32-31-33-865-056-A

H. 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
49VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	H12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	R35
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
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	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33
121VU	LGCIU/BAT SPLY/SYS2	59GA	R32
121VU	LGCIU/BAT SPLY/SYS1	58GA	R31

Subtask 32-31-33-869-052-A

I. Preparation for Test
(1) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).
(2) If the flight configuration precautions were obeyed, put the aircraft back to the serviceable condition (Ref. AMM TASK 32-00-00-860-002).
(3) Remove the CONTAINER 5 L (1.32 USGAL).
(4) Remove the WARNING NOTICE(S).
(5) Remove the access platform(s).
(6) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).
(7) If necessary, fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001).

Subtask 32-31-33-710-050-A

J. Test(s)
(1) Do the operational test of the landing gear doors (Ref. AMM TASK 32-31-00-710-002).
(2) Do the operational test of the gear uplock and door uplock mechanical-control-system (Ref. AMM TASK 32-33-00-710-001).
(3) Open the applicable MLG door (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that there is no hydraulic fluid leakage from the MLG door uplock 2520GM (2521GM).

5. Close-up
Subtask 32-31-33-410-050-A

A. Close Access
(1) Apply corrosion preventive compound to the nuts, bolts, pipe connections and adjacent areas (Ref. AMM TASK 51-75-13-916-002).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:45:01 UTC