Installation of the NLG-Door Ground-Opening Control-Unit

TASK 32-22-17-400-001-A
Installation of the NLG-Door Ground-Opening Control-Unit

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: 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.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	2	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
98A32301000000	1	RIGGING PIN
98A32301013000	1	RIGGING PIN

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06AEB2)	Polysulfide Sealant-Low Adhesion Fillet Structure
(Material No.12ADB1)	Corrosion Preventive Compound-Water Displacing & Heavy Duty Hard Film -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
35	COTTER PINS	AIPC 32-31-01-08-010
33	COTTER PIN	AIPC 32-31-01-08-100
14	COTTER PIN	AIPC 32-31-01-09-010
22	COTTER PIN	AIPC 32-31-01-09-010
28	COTTER PIN	AIPC 32-31-01-09-010
50	COTTER PIN	AIPC 32-31-01-09-010
51	LOCKING NUTS	AIPC 32-31-01-09-070
7	LOCKING NUTS	AIPC 32-31-01-09-070
13	LOCKING NUT	AIPC 32-31-01-09-130
35	COTTER PINS	AIPC 32-31-81-08-010
33	COTTER PIN	AIPC 32-31-81-08-100
14	COTTER PIN	AIPC 32-31-81-09-010
22	COTTER PIN	AIPC 32-31-81-09-010
28	COTTER PIN	AIPC 32-31-81-09-010
50	COTTER PIN	AIPC 32-31-81-09-010
51	LOCKING NUTS	AIPC 32-31-81-09-100
7	LOCKING NUTS	AIPC 32-31-81-09-100
13	LOCKING NUT	AIPC 32-31-81-09-140

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
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 29-23-00-863-001-A	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 29-23-00-864-001-A	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
TASK 32-00-00-481-002-A	Installation of the Safety Devices on the Landing Gear Doors
TASK 32-22-00-010-001-A	Nose Gear Doors - Ground Doors Opening
TASK 32-22-00-410-001-A	Nose Gear Doors - Ground Doors Closing
TASK 32-31-41-400-001-A	Installation of the NLG Main-Door Control-Rod
TASK 53-12-13-000-001-A	Removal of the avionics compartment floor panels
TASK 53-12-13-400-001-A	Installation of the avionics compartment floor panels
NLG-Door Ground-Opening Control-Unit

3. Job Set-up
Subtask 32-22-17-860-050-D

A. Aircraft Maintenance Configuration

NLG-Door Ground-Opening Control-Unit

(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the Green hydraulic system is depressurized
(Ref. AMM TASK 29-10-00-864-001) or (Ref. AMM TASK 29-23-00-864-001).
(3) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position below the control unit, in zone 123.
(4) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position below access door 811.
(5) Make sure that access door 811 is open.
(6) In the avionics compartment, make sure that floor panel 127BG is removed (Ref. AMM TASK 53-12-13-000-001).
(7) In the cockpit, on right-center instrument panel 400VU:

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

(8) Make sure that the safety devices are installed:

On the nose landing gear (Ref. AMM TASK 32-00-00-481-001)
On the NLG doors (Ref. AMM TASK 32-00-00-481-002).

(9) Make sure that a WARNING NOTICE(S) is in position to tell persons not to pressurize the Green hydraulic system:

In the cockpit, on the HYD section of panel 40VU
On the ground service panel of the Green hydraulic system, access door 197CB.

(10) Make sure that the 98A32301013000 RIGGING PIN (1) is installed on the NLG-door ground-opening bypass-valve (2533GM).
(11) Make sure that the 98A32301000000 RIGGING PIN (2) is installed on the NLG door uplock-assembly (2534GM) in the related hole.

4. Procedure
Subtask 32-22-17-914-050-A

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent area.
(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 a thin layer of Polysulfide Sealant-Low Adhesion Fillet Structure (Material No.06AEB2) to the interface between the aircraft structure and the ground door-opening handle (39).

Subtask 32-22-17-420-050-A

B. Installation of the Ground Door-Opening Handle Assembly

NOTE: Two persons are necessary for this procedure.

(1) Put the ground door-opening handle (39) in position on the aircraft structure.

NOTE: Two persons are necessary to install the ground door-opening handle (39), one in the nose gear well, one in the avionics compartment.

(a) Install the three bolts (40), the three washers (37) and the three nuts (36).
(b) Tighten the nuts (36) and safety them with new AIPC 32-31-01-08-010 COTTER PINS (35) or AIPC 32-31-81-08-010 COTTER PINS (35).
(2) Put the ground door-opening handle (39) in the CLOSED position and put the safety pin (38) in position.

Subtask 32-22-17-420-051-A

C. Installation of the Torque Tube Assembly
(1) Put the torque tube assembly (6) in position on the aircraft structure.
(2) Put the bearing assemblies (30) in position on each side of the torque tube assembly (6):
(a) Engage each side of the torque tube assembly (6) in the bearing assemblies (30).
(b) On each bearing assembly, install the three bolts (52) and the three new AIPC 32-31-01-09-070 LOCKING NUTS (51) or AIPC 32-31-81-09-100 LOCKING NUTS (51).
(c) Tighten the locking nuts (51).
(3) Install the washer (48) and the nut (49).
(4) Tighten the nut (49) and safety it with a new AIPC 32-31-01-09-010 COTTER PIN (50) or AIPC 32-31-81-09-010 COTTER PIN (50).
(5) On the opposite side, measure the clearance between the torque tube assembly (6) and the bearing assembly (30):
(a) Make sure that the clearance J1 is 2 -1 +1 mm (0.08 -0.04 +0.04 in.).
(6) Installation of the two half clamps (8):
(a) Put the two half clamps (8) in position on the aircraft structure.
(b) Make sure that the bearing (11) is in position in the two half clamps (8).
(c) Install the two bolts (12) and the two new AIPC 32-31-01-09-070 LOCKING NUTS (7) or AIPC 32-31-81-09-100 LOCKING NUTS (7).
(d) Tighten the locking nuts (7).
(e) Install the washer (9), the bolt (10) and the new AIPC 32-31-01-09-130 LOCKING NUT (13) or AIPC 32-31-81-09-140 LOCKING NUT (13).
(f) Tighten the locking nut (13).

Subtask 32-22-17-916-050-A

D. Protection of the Fasteners

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

(1) Apply Corrosion Preventive Compound-Water Displacing & Heavy Duty Hard Film - (Material No.12ADB1) on the head of the bolts (10), (12), (40) and (52).
(2) Apply Corrosion Preventive Compound-Water Displacing & Heavy Duty Hard Film - (Material No.12ADB1) on the nuts (36) and (49).
(3) Apply Corrosion Preventive Compound-Water Displacing & Heavy Duty Hard Film - (Material No.12ADB1) on the locking nuts (7), (13) and (51).

Subtask 32-22-17-420-052-A

E. Connection of the Rods to the NLG-Door Ground-Opening Control-Unit
(1) Put the rod (31) in position in the forks of the ground door-opening handle (39) and make sure that the holes are aligned.
(2) Install the bush (42), the bolt (41), the washer (32) and the nut (34).
(3) Tighten the nut (34) and safety it with a new AIPC 32-31-01-08-100 COTTER PIN (33) or AIPC 32-31-81-08-100 COTTER PIN (33).
(4) Put the rod (31) in position in the forks of the bellcrank (26) and make sure that the holes are aligned.
(5) Install the bush (25) the bolt (24), the washer (27) and the nut (29).
(6) Tighten the nut (29) and safety it with a new AIPC 32-31-01-09-010 COTTER PIN (28) or AIPC 32-31-81-09-010 COTTER PIN (28).
(7) Put the rod (20) in position in the forks of the bellcrank (43) and make sure that the holes are aligned.
(8) Adjustment of the Rod

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.

(a) Adjust the rod (20), if necessary:
1 Cut and discard the lockwire from the nut (46).
2 Loosen the nut (46) and release the lockwasher (47).
3 Turn the rod (20) until the holes are aligned.
4 Tighten the nut (46) and safety it with lockwire 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(9) Install the bush (44), the bolt (45), the washer (21) and the nut (23).
(10) Tighten the nut (23) and safety it with a new AIPC 32-31-01-09-010 COTTER PIN (22) or AIPC 32-31-81-09-010 COTTER PIN (22).
(11) Put the rod (5) in position in the forks of the bellcrank (17) and make sure that the holes are aligned.
(12) Adjustment of the Rod

(a) Adjust the rod (5), if necessary:
1 Cut and discard the lockwire from the nut (3).
2 Loosen the nut (3) and release the lockwasher (4).
3 Turn the rod (5) until the holes are aligned.
4 Tighten the nut (3) and safety it with lockwire 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(13) Install the bush (18), the bolt (19), the washer (16) and the nut (15).
(14) Tighten the nut (15) and safety it with a new AIPC 32-31-01-09-010 COTTER PIN (14) or AIPC 32-31-81-09-010 COTTER PIN (14).

Subtask 32-22-17-080-050-A

F. Removal of the Rigging Pins
(1) Remove the 98A32301013000 RIGGING PIN (1) from the NLG-door ground-opening bypass-valve (2533GM).
(2) Remove the 98A32301000000 RIGGING PIN (2) from the NLG door uplock-assembly (2534GM).

Subtask 32-22-17-710-050-A

G. Check of the NLG-Door Ground-Opening Control-Unit
(1) Make sure that the safety devices are installed on the NLG doors.
(2) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
(3) Remove the safety pin (38) and operate the ground door-opening handle (39) to do five NLG DOOR CLOSE/DOOR OPEN cycles at a very low speed (Ref. AMM TASK 32-22-00-410-001) and (Ref. AMM TASK 32-22-00-010-001) to bleed the hydraulic system.
(4) During these operations, make sure that all the control components move freely and do not touch or rub against the structure.
(5) Put the ground door-opening handle (39) in the OPEN position.
(6) Install the safety pin (38) on the ground door-opening handle (39).
(7) Make sure that the uplock hook of the NLG door uplock-assembly (2534GM) is in the open position.
(8) Depressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-864-001) or (Ref. AMM TASK 29-23-00-864-001).

Subtask 32-22-17-420-053-A

H. Connection of the Control Rod
(1) Connect the lower attachment of the control rod (Ref. AMM TASK 32-31-41-400-001).

Subtask 32-22-17-916-051-A

I. Protection of the Fasteners

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

(1) Apply Corrosion Preventive Compound-Water Displacing & Heavy Duty Hard Film - (Material No.12ADB1) on the head of the bolts (19), (44), (24) and (41).
(2) Apply Corrosion Preventive Compound-Water Displacing & Heavy Duty Hard Film - (Material No.12ADB1) on the nuts (15), (23), (29) and (34).

Subtask 32-22-17-941-051-A

J. Preparation for Test
(1) Make sure that the travel range of the NLG doors is clean and clear of tools and other items.
(2) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).

Subtask 32-22-17-710-051-A

K. Test of the Door Ground-Opening Control-Unit
(1) Do a full NLG DOOR CLOSE/DOOR OPEN cycle on the ground (Ref. AMM TASK 32-22-00-010-001) and (Ref. AMM TASK 32-22-00-410-001) .
(2) During this test, make sure that the components operate correctly.

5. Close-up
Subtask 32-22-17-410-050-D

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) In the avionics compartment, install the floor panel 127BG (Ref. AMM TASK 53-12-13-400-001).
(3) Close the access door 811.
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).
(6) De-energize the ground service network
(7) Remove the SAFETY BARRIER(S).

[Rev.10 from 2021] 2026.04.01 00:43:31 UTC