Adjustment of the NLG Door Open Proximity Sensors

TASK 32-31-73-820-004-A
Adjustment of the NLG Door Open Proximity Sensors

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.

FIN: 36GA
FIN: 37GA
FIN: 38GA
FIN: 39GA

1. Reason for the Job
To set the NLG door open proximity sensor clearances to the correct dimensions.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06AAB1)	Polysulfide Sealant-General Purpose Fillet -

C. Referenced Information

REFERENCE	DESIGNATION
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 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 32-22-00-010-001-A	Nose Gear Doors - Ground Doors Opening
TASK 32-22-00-220-001-A	Check of the NLG Doors Clearances and Mismatches
TASK 32-22-00-410-001-A	Nose Gear Doors - Ground Doors Closing
TASK 32-22-00-820-001-A	Adjustment of the NLG doors
NLG Door Open Proximity Sensors - Dimension Checks
NLG Proximity Sensors - Component Details

3. Job Set-up
Subtask 32-31-73-941-061-A

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) 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
Put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear and the NLG doors.

(4) Put a WARNING NOTICE(S) on the GRAVITY GEAR EXTN handle (panel 110VU) to tell persons not to operate the landing gear.

Subtask 32-31-73-010-059-A

B. Get Access
(1) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) in position below the applicable zone 123 (124).

Subtask 32-31-73-869-062-A

C. Flight Configuration Precautions
(1) If the electrical power is not necessary for other maintenance tasks, de-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002). Then, it is not necessary to open 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 32-31-73-865-075-A

D. Open, safety and tag 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

4. Procedure
Subtask 32-31-73-220-084-A

A. Dimensional Checks
(1) Measure the dimension X, the vertical distance between the center of the proximity sensor and the center of its target. Make sure that the dimension X is to a maximum of 3.0 mm (0.1181 in.).

NOTE: The target center location can be on each side of the sensor center.

(2) Measure the dimension Y, the horizontal distance between the center of the proximity sensor and the center of its target. Make sure the the dimension Y is to a maximum of 2.5 mm (0.0984 in.).

NOTE: The target center location can be on each side of the sensor center.

(3) Measure the dimension Z, the distance between the proximity sensor and its target. Make sure that the dimension Z is 2.0 mm (0.0787 in.) +/- 0.5 mm (0.0197 in.).

Subtask 32-31-73-820-053-A ** ON A/C NOT FOR ALL

B. Adjustment of the NLG Door Open Proximity Sensors 36GA, 37GA, 38GA, 39GA
(1) If the dimension Z and/or the dimension X is incorrect, do a check of the NLG door clearances and mismatches (Ref. AMM TASK 32-22-00-220-001).
(2) If necessary, adjust the NLG doors (Ref. AMM TASK 32-22-00-820-001).

Subtask 32-31-73-820-053-B ** ON A/C NOT FOR ALL

B. Adjustment of the NLG Door Open Proximity Sensors 36GA, 37GA, 38GA, 39GA
(1) If the dimension Z is incorrect, do a check of the NLG door clearances and mismatches (Ref. AMM TASK 32-22-00-220-001).
(2) If necessary, adjust the NLG doors (Ref. AMM TASK 32-22-00-820-001).
(3) To adjust the proximity sensor (2) for dimension X:
(a) Loosen the nuts (1).
(b) Make sure the proximity sensor (2) center is not more than a maximum distance of 3.0 mm (0.1181 in.) from the target (3) center.

NOTE: The proximity sensor (2) center location can be on each side of the target (3) center.

.
(d) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the nuts (1).
(4) If the dimension X stays incorrect, do a check of the NLG door clearances and mismatches (Ref. AMM TASK 32-22-00-220-001).
(5) If necessary, adjust the NLG doors (Ref. AMM TASK 32-22-00-820-001).

Subtask 32-31-73-865-076-A

C. 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 32-31-73-869-063-A

D. Ground Configuration
(1) If you did not de-energize the aircraft electrical circuits, put the aircraft back to the ground configuration (Ref. AMM TASK 32-00-00-860-002).

Subtask 32-31-73-410-059-A

E. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).

5. Close-up
Subtask 32-31-73-942-060-A

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 00:46:00 UTC