Installation of the Door Assembly - Main

TASK 32-12-11-400-001-A
Installation of the Door Assembly - Main

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

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.

WARNING: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.

CAUTION: DO NOT CAUSE DAMAGE TO THE SURFACES. THE COMPONENTS ARE MADE OF CARBONFIBER REINFORCED PLASTIC.

CAUTION: DO NOT MOVE THE ACTUATOR SUDDENLY. SUDDEN MOVEMENT CAN CAUSE DAMAGE AT THE FORK LUG OF THE ACTUATOR FITTING AT THE KEEL BEAM.

CAUTION: THIS PART IS A REMOVABLE STRUCTURAL COMPONENT (RSC), WHICH CAN BE MOVED BETWEEN AIRCRAFT. THUS IT CAN HAVE DIFFERENT OPERATION CONDITIONS AND A DIFFERENT LIFE RECORD (FLIGHT HOURS/FLIGHT CYCLES/CALENDAR) FROM THE AIRCRAFT IT IS INSTALLED ON OR REMOVED FROM. THE OPERATOR IS RESPONSIBLE FOR THE SPECIFIC TRACKING AND CONTINUED AIRWORTHINESS OF REMOVABLE STRUCTURAL COMPONENTS. INCORRECT MAINTENANCE OF THESE COMPONENTS CAN CAUSE A RISK FOR THE FLIGHT SAFETY.

ZONE: 147
ZONE: 148
ZONE: 734
ZONE: 744

1. Reason for the Job

NOTE: This task can contribute to fuel saving.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 0.192 and 0.124 m.daN (16.99 and 10.97 lbf.in )
No specific	Torque wrench: range to between 0.192 and 0.125 m.daN (16.99 and 11.06 lbf.in )
No specific	Torque wrench: range to between 0.28 and 0.22 m.daN (24.78 and 19.47 lbf.in )
No specific	Torque wrench: range to between 5.50 and 2.75 m.daN (40.56 and 20.28 lbf.ft )
98D32109005000	2	BULLET-LOCATING, MLG PIVOT BOLT

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03HBD9)	Synthetic Ester base Grease-General Purpose Low Temp -
(Material No.04TMB2)	Varnish-- Electrical Bonding Structure
(Material No.06AAA1)	Polysulfide Sealant_General Purpose Brushable -
(Material No.06AAB1)	Polysulfide Sealant-General Purpose Fillet -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
147	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT
148	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT
734	MAIN DOOR
744	MAIN DOOR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	COTTER PIN	AIPC 32-12-03-01-030
11	COTTER PIN	AIPC 32-12-03-01-100
23	COTTER PIN	AIPC 32-12-03-01-130
2	COTTER PIN	AIPC 32-12-83-01-030
23	COTTER PIN	AIPC 32-12-83-01-030
11	COTTER PIN	AIPC 32-12-83-01-130
1	COTTER PIN	AIPC 52-81-18-03-120
1	COTTER PIN	AIPC 52-81-84-03-120

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-22-32-640-001-A	Lubrication of Main Landing Gear and Doors
TASK 20-21-11-911-001-A	Tightening Torques for Standard Threaded Fasteners
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 29-10-00-864-001-A	Depressurize the Green Hydraulic System
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
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 32-31-35-400-001-A	Installation of the MLG Door Actuating-Cylinder
Main Gear Doors
Main Gear Doors - Adjustment
Main Gear Door (Z734/Z744) - Adjustment
Main Gear Door (Z734/744) - Adjustment
Main Gear Doors (Z734/Z744) - Adjustment

3. Job Set-up
Subtask 32-12-11-860-054-A

A. Aircraft Maintenance Configuration
(1) Make sure that the Green hydraulic system is depressurized
(Ref. AMM TASK 29-10-00-864-001).
(2) Make sure that the warning notices are in the flight compartment to tell persons not to operate the flight controls.
(3) Make sure that the warning notices are in position to tell persons not to operate the hydraulic systems.
(4) Make sure that the access platforms are in position at zone 734 and/or zone 744.

Subtask 32-12-11-860-059-A

B. Flight Configuration Precautions
(1) If the electrical power is not necessary for other maintenance tasks, make sure that the aircraft electrical circuits are de-energize (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 32-12-11-865-057-A

C. 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
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33
121VU	HYDRAULIC/Y HYD/PUMP ENG2/MONG	3700GD	Q37
121VU	HYDRAULIC/Y HYD/PUMP ENG2/CTL	3701GD	Q36
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

Subtask 32-12-11-210-050-A

D. Visual Inspection
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.

Subtask 32-12-11-110-050-A

E. Cleaning
(1) Clean the component interfaces and the adjacent area.

4. Procedure
Subtask 32-12-11-420-054-A

A. Preparation for Installation
(1) Install the spacers (5) and (14) and the flexible bearing (6).
(2) Put the main gear door in position below the aircraft.
(3) Apply a thin layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) to the hinge bolts (13) and (18).
(4) Install the 98D32109005000 BULLET-LOCATING, MLG PIVOT BOLT on the hinge bolts (13) and (18).

CAUTION: MAKE SURE THAT THE POSITION OF THE PODGER ON THE MLG DOOR AGREES WITH THE DIMENSIONS OF THE TIRES.

(5) If necessary, move the podger (20) to the correct position:
(a) Remove the nuts (21) and the screws (19).
(b) Move the podger (20) to the correct position.
(c) Install the screws (19) and the nuts (21).
(d) TORQUE the nuts (21) to between 0.28 and 0.22 m.daN (24.78 and 19.47 lbf.in )

Subtask 32-12-11-420-055-C ** ON A/C NOT FOR ALL

B. Installation of the Main Gear Door

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.

(1) Lift the main gear door and put it in position on the structure.
(2) Install the aft hinge bolt (13) as follows:
(a) Install the aft hinge bolt (13) in the aft fitting (7).
(b) Remove the 98D32109005000 BULLET-LOCATING, MLG PIVOT BOLT from the aft hinge bolt (13).
(c) Install the spacer (5), the washer (4) and the nut (3) on the aft hinge bolt (13).
(3) Install the forward hinge bolt (18) as follows:
(a) Install the forward hinge bolt (18) in the forward fitting (17).
1 Do not install the washers (15) and (16) at this time. You will install these washers in the adjustment procedure.
(b) Remove the 98D32109005000 BULLET-LOCATING, MLG PIVOT BOLT from the forward hinge bolt (18).
(c) Install the spacer (14), the washer (25) and the nut (24) on the forward hinge bolt (18).
(4) Connect the actuator (1) 2523GM (2522GM) to the main gear door (Ref. AMM TASK 32-31-35-400-001).
(a) Do not move the actuator (1) suddenly. Sudden movement can cause damage at the fork lug of the actuator fitting at the keel beam.
(5) TORQUE the nuts (3) and (24) on the hinge bolts (13) and (18) to between 5.50 and 2.75 m.daN (40.56 and 20.28 lbf.ft )

.
(6) Safety the nut (3) on the aft hinge bolt (13) with a new AIPC 32-12-03-01-030 COTTER PIN (2) or a new AIPC 32-12-83-01-030 COTTER PIN (2).
(a) Do not safety the nut (24) on the forward hinge bolt (18) at this time.
(7) Connect the bonding leads (12) with the screws (8), the washers (9) and the nuts (10).
(8) Safety the nuts (10) with a new AIPC 32-12-03-01-100 COTTER PIN (11) or a new AIPC 32-12-83-01-130 COTTER PIN (11).

Subtask 32-12-11-420-055-E ** ON A/C NOT FOR ALL

B. Installation of the Main Gear Door
(1) Lift the main gear door and put it in position on the structure.
(2) Install the aft hinge bolt (13) as follows:
(a) Install the aft hinge bolt (13) in the aft fitting (7).
(b) Remove the 98D32109005000 BULLET-LOCATING, MLG PIVOT BOLT from the aft hinge bolt (13).
(c) Install the spacer (5), washer (4) and nut (3) on the aft hinge bolt (13).
(3) Install the forward hinge bolt (18) as follows:
(a) Install the forward hinge bolt (18) in the forward fitting (17).
1 Do not install the washers (15) and (16) at this time. You will install these washers in the adjustment procedure.
(b) Remove the 98D32109005000 BULLET-LOCATING, MLG PIVOT BOLT from the forward hinge bolt (18).
(c) Install the spacer (14), washer (25) and nut (24) on the forward hinge bolt (18).
(4) Connect the actuator (1) 2523GM (2522GM) to the main gear door (Ref. AMM TASK 32-31-35-400-001).
(a) Do not move the actuator (1) suddenly. Sudden movement can cause damage to the fork lug of the actuator fitting at the keel beam.
(5) TORQUE the nut (24) on the forward hinge bolt (18) to between 5.50 and 2.75 m.daN (40.56 and 20.28 lbf.ft )

.
(6) TORQUE the nut (3) on the aft hinge bolt (13) to between 5.50 and 2.75 m.daN (40.56 and 20.28 lbf.ft )

.
(a) Apply a minimum torque value of 2.75 m.daN (20.28 lbf.ft) to the nut (3).
(b) Increase the torque until the first cotter pin hole is aligned with a slot of the nut (3).
(c) Do not torque the nut (3) to more than the maximum torque value.
(7) Safety the nut (3) on the aft hinge bolt (13) with a new AIPC 32-12-03-01-030 COTTER PIN (2) or a new AIPC 32-12-83-01-030 COTTER PIN (2).
(a) Do not safety the nut (24) on the forward hinge bolt (18) at this time.
(8) Connect the bonding leads (12) with the screws (8), the washers (9) and the nuts (10).
(9) Safety the nuts (10) with a new AIPC 32-12-03-01-100 COTTER PIN (11) or a new AIPC 32-12-83-01-130 COTTER PIN (11).

Subtask 32-12-11-916-050-A

C. Protective Treatment
(1) Apply Polysulfide Sealant_General Purpose Brushable - (Material No.06AAA1) on the attachments and the bonding leads (12).
(2) Make sure that the sealant area makes an overlap of 5 mm (0.20 in.) on the surfaces with no protection.
(3) Make sure that the surfaces with no protection are fully sealed.
(4) When the sealant is cured, apply a layer of Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the sealant area.
(5) Make sure that the varnish area makes an overlap of 3 mm (0.12 in.) on the sealant surface.

Subtask 32-12-11-640-050-A

D. Lubrication
(1) Lubricate the door hinge connection points (Ref. AMM TASK 12-22-32-640-001).

Subtask 32-12-11-820-055-E ** ON A/C NOT FOR ALL

E. Adjustment of the Hinge Point Attachments

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.

(1) Close the MLG doors to the fully closed position with the uplock locked (Ref. AMM TASK 32-12-00-410-001).
(2) Make sure that the Green hydraulic system is depressurized
(Ref. AMM TASK 29-10-00-864-001).
(3) Measure the clearance between the main gear door and the aircraft structure. Make sure that the clearances are as follow:

Main Gear Doors - Adjustment ** ON A/C NOT FOR ALL

From points A to B, clearance Y is 8.5 +2.25 mm or -2.25 mm (0.3346 +0.0886 in. or -0.0886 in.)
From points B to C, clearance X is 4.5 +3.5 mm or -2.5 mm (0.1772 +0.1378 in. or -0.0984 in.).

(4) If the clearances are not correct, adjust on the hinge point attachments:
(a) Open the MLG door (Ref. AMM TASK 32-12-00-010-001).
(b) If the cotter pin (23) is installed, remove and discard it.
(c) Remove the nut (24), the washer (25), the spacer (14) and the forward hinge bolt (18).
(d) Install a maximum of one washer (16) between the spherical bearing of the forward fitting (17) and the aircraft structure at bolt head side. Make sure that the clearance E is between 0 mm (0.0 in.) and 1 mm (0.0394 in.).

NOTE: The installation of the washer (16) moves the door rearwards. Remove or peel-off the washer (16) to move the door forward.

(e) Install the 98D32109005000 BULLET-LOCATING, MLG PIVOT BOLT on the forward hinge bolt (18).
(f) Install the forward hinge bolt (18) and the spacer (14).
(g) Remove the 98D32109005000 BULLET-LOCATING, MLG PIVOT BOLT from the forward hinge bolt (18).
(h) Install the washer (25) and the nut (24).
(i) TORQUE the nut (24) to between 5.50 and 2.75 m.daN (40.56 and 20.28 lbf.ft )

.
1 Apply a minimum torque value of 2.75 m.daN (20.28 lbf.ft) to the nut (24).
2 Increase the torque until the first cotter pin hole is aligned with a slot of the nut (24).
3 Do not torque the nut (24) to more than the maximum torque value.
(j) Safety the nut (24) with a new AIPC 32-12-03-01-130 COTTER PIN (23) or a new AIPC 32-12-83-01-030 COTTER PIN (23).

NOTE: To install the cotter pin (23) correctly, you can add a maximum of two washers (16) between the spherical bearing of the forward fitting (17) and the spacer (14).

(k) Make sure that clearance F between the spherical bearing of the forward fitting (17) and the spacer (14) is between 0 mm (0.0 in.) to 2 mm (0.0787 in.).
(5) Make sure that clearance D is a minimum of 1 mm (0.0394 in.).
(6) After the adjustment, make sure that:

The spacer (14) is installed between the washer (25) and the aircraft structure
Clearance G between the washer (25) and the aircraft structure is a minimum of 0.1 mm (0.0039 in.).

(7) If clearance G is not correct, do the steps that follow:
(a) Do this subtask again.
(b) Install an additional washer (15) between the spherical bearing of the forward fitting (17) and the spacer (14).

Subtask 32-12-11-820-055-F ** ON A/C NOT FOR ALL

E. Adjustment of the Hinge Point Attachments

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.

Main Gear Doors - Adjustment ** ON A/C NOT FOR ALL

From points A to B, clearance Y is 8.5 -2.25 mm or +2.25 mm (0.3346 -0.0886 in. or +0.0886 in.)
From points B to C, clearance X is 4.5 -2.5 MM or +3.5 MM (0.1772 -0.0984 IN. or +0.1378 IN.).

(4) If the clearances are not correct, adjust the hinge point attachments as follows:
(a) Open the MLG door (Ref. AMM TASK 32-12-00-010-001).
(b) If the cotter pin (23) is installed, remove and discard it.
(c) Remove the nut (24), the washer (25), the spacer (14) and the forward hinge bolt (18).
(d) Install a maximum of one washer (16) between:

The spherical bearing of the forward fitting (17) and the aircraft structure at the bolt head side.

1 If the MLG door moved rearward, remove or peel-off the washer (16) to move the MLG door forward.

NOTE: The installation of the washer (16) moves the MLG door rearward.

2 Make sure that clearance E is between 0 mm (0 in.) and 1 mm (0.0394 in.).
(e) Install the 98D32109005000 BULLET-LOCATING, MLG PIVOT BOLT on the forward hinge bolt (18).
(f) Install the forward hinge bolt (18) and the spacer (14).
(g) Remove the 98D32109005000 BULLET-LOCATING, MLG PIVOT BOLT from the forward hinge bolt (18).
(h) Install the washer (25) and the nut (24).
(i) TORQUE the nut (24) to between 5.50 and 2.75 m.daN (40.56 and 20.28 lbf.ft )

.
(j) Safety the nut (24) with the new AIPC 32-12-03-01-130 COTTER PIN (23) or the new AIPC 32-12-83-01-030 COTTER PIN (23).

NOTE: To install the cotter pin (23) correctly, you can add a maximum of two washers (16) between:

The spherical bearing of the forward fitting (17) and the spacer (14).

(k) Make sure that clearance F between the spherical bearing of the forward fitting (17) and the spacer (14) is:

Between 0 mm (0 in.) and 2 mm (0.0787 in.).

(5) Make sure that clearance D is a minimum of 1 mm (0.0394 in.).
(6) After the adjustment, make sure that:

The spacer (14) is installed between the washer (25) and the aircraft structure
Clearance G between the washer (25) and the aircraft structure is a minimum of 0.1 mm (0.0039 in.).

Subtask 32-12-11-640-051-A

F. Sealing of the Hinge Bolts
(1) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the hinge bolt (18) and the nut (24).
(2) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the hinge bolt (13) and the nut (3).

Subtask 32-12-11-820-057-C

G. Adjustment of the Door Stopper

Main Gear Door (Z734/Z744) - Adjustment

(1) Close the MLG doors to the fully closed position with the Uplock locked (Ref. AMM TASK 32-12-00-410-001).

NOTE: Make sure that green hydraulic system is depressurized.

(2) Measure the step between the MLG door rear edge and the airframe structure. The door should make a continuous surface with the adjacent fairing structure:
(a) A maximum step of 1.5 mm (0.0591 in.) inside of the adjacent fairing structure is permitted.
(b) It is also permitted a maximum step of 2.5 mm (0.0984 in.) inside of the adjacent structure on 305 mm (12.0079 in.) (10%) of the gap length (MLG door rear edge).
(c) A maximum step of 2.5 mm (0.0984 in.) out of the adjacent fairing structure is permitted.
(d) It is also permitted a maximum step of 5.0 mm (0.1969 in.) out of the adjacent structure on the last 80 mm (3.1496 in.) of the upper part (MLG door rear edge).
(3) Adjust the door stoppers assemblies if the step is greater than the maximum:
(a) Open the MLG door (Ref. AMM TASK 32-12-00-010-001).
(b) Remove the nuts (1), the washers (2) and the screws (6).
(c) Remove the stop (5) and the plate (3).
(d) Add or remove the plate set-packing (4) as necessary.
(e) Install the stop (5) with the plate set-packing (4) and the plate (3) with the screws (6) the washers (2) and the nuts (1).

Subtask 32-12-11-820-058-A

H. Adjustment of the Uplock Roller

Main Gear Door (Z734/744) - Adjustment

(1) Close the MLG doors to the fully closed position with the Uplock locked (Ref. AMM TASK 32-12-00-410-001).

NOTE: Make sure that green hydraulic system is depressurized.

(2) Measure the step between the MLG door forward edge and the airframe structure. The door should make a continuous surface with the adjacent fairing structure:
(a) A maximum step of 2.5 mm (0.0984 in.) inside of the adjacent fairing structure is permitted.
(b) It is also permitted a maximum step of 5.0 mm (0.1969 in.) inside of the adjacent structure on the first 80 mm (3.1496 in.) of the upper part (MLG door rear edge).
(c) A maximum step of 1.5 mm (0.0591 in.) out of the adjacent fairing structure is permitted.
(d) It is also permitted a maximum step of 2.5 mm (0.0984 in.) out of the adjacent structure on 305 mm (12.0079 in.) (10%) of the gap length (MLG door forward edge).
(3) Adjust the uplock roller assembly as shown in view B if the step is greater than the maximum:
(a) Open the MLG door (Ref. AMM TASK 32-12-00-010-001).
(b) Remove and discard the cotter pins (1).
(c) Loosen the nuts (2).
(d) Move the Uplock roller assembly mounting bracket (3) in the required direction:
1 To lower the door, move the Uplock mounting bracket up, or
2 To raise the door, move the Uplock mounting bracket down.
(e) Tighten the nuts (2) (Ref. AMM TASK 20-21-11-911-001).
(f) Safety the nuts (2) with a new AIPC 52-81-18-03-120 COTTER PIN (1) or AIPC 52-81-84-03-120 COTTER PIN (1).

Subtask 32-12-11-820-059-A

I. Adjustment of the Proximity Sensors

NOTE: Make sure that green hydraulic system is depressurized

(1) Open the MLG doors to the fully open position (Ref. AMM TASK 32-12-00-010-001).
(2) Measure the gap X between the proximity sensors and the targets

Main Gear Doors (Z734/Z744) - Adjustment

The correct gap should be 2.0 +0.5 mm or -0.5 mm (0.0787 +0.0197 in. or -0.0197 in.). If the gap is not correct, adjust on the proximity sensors.
(a) Disconnect the electrical connector (3) from the applicable proximity sensor (4):

for System 1, LH, disconnect FIN 33GA
for System 1, RH, disconnect FIN 32GA
for System 2, LH, disconnect FIN 35GA
for System 2, RH, disconnect FIN 34GA.

(b) Put a blanking cap on the disconnected electrical connector (3).
(c) Remove the nuts (1), the washers (2) and the bolts (10).
(d) Remove the proximity sensor (4).
(e) Adjust the thickness of the peelable shims (11):

To increase the gap, remove the peelable shims (11) as required, or
To decrease the gap, add peelable shims (11) as required.

(f) Put the proximity sensor (4) in position on the proximity sensor mounting bracket.
(g) Install the bolts (10), the washers (2) and the nuts (1).
(h) TORQUE the nuts (1) to between 0.192 and 0.125 m.daN (16.99 and 11.06 lbf.in )

.
(i) Add Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the bolts (10) and the nuts (1).
(j) Remove the blanking cap from the electrical connector (3).
(k) Make sure that the electrical connector (3) is in the correct condition.
(l) Connect the electrical connector (3) to the applicable proximity sensor (4):

for System 1, LH, connect FIN 33GA
for System 1, RH, connect FIN 32GA
for System 2, LH, connect FIN 35GA
for System 2, RH, connect FIN 34GA.

Subtask 32-12-11-820-060-A

J. Adjustment of the Targets

NOTE: Make sure that green hydraulic system is depressurized

(1) Measure the dimension Y between the center lines of the proximity sensors and the targets

Main Gear Doors (Z734/Z744) - Adjustment

The correct dimensions should be to a maximum of 2.5 mm (0.0984 in.) either side of the center lines. If the dimension is not correct, adjust on the targets.
(a) Remove the nuts (8), the washers (9) and the bolts (5).
(b) Remove the target (6).
(c) Adjust the thickness of the peelable shims (7):

To move the target forward, add peelable shims (7) as required, or
To move the target rearward, remove the peelable shims (7) as required.

(d) Put the target (6) in position on the target mounting bracket.
(e) Install the bolts (5), the washers (9) and the nuts (8).
(f) TORQUE the nuts (8) to between 0.192 and 0.124 m.daN (16.99 and 10.97 lbf.in )

.
(g) Add Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the bolts (5) and the nuts (8).

Subtask 32-12-11-710-050-A

K. Operational Test
(1) Do an operational test of the main gear doors (Ref. AMM TASK 32-31-00-710-002).

5. Close-up
Subtask 32-12-11-860-055-A

A. Depressurize Hydraulic Systems
(1) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).

Subtask 32-12-11-865-054-A

B. 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
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33
121VU	HYDRAULIC/Y HYD/PUMP ENG2/MONG	3700GD	Q37
121VU	HYDRAULIC/Y HYD/PUMP ENG2/CTL	3701GD	Q36
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

Subtask 32-12-11-860-060-A

C. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 32-12-11-942-050-A

D. Remove Ground Equipment
(1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 00:41:15 UTC