Check of the NLG Doors Clearances and Mismatches

TASK 32-22-00-220-001-A
Check of the NLG Doors Clearances and Mismatches

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 TRAVEL RANGES OF THE LANDING GEAR ARE CLEAR.

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	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	ROD - NON METALLIC
No specific	AR	TIE WRAP(S)
No specific	AR	WARNING NOTICE(S)
98F32304000000	4	TARGET-FALSE

B. Referenced Information

REFERENCE	DESIGNATION
TASK 07-11-00-581-003-A	Lifting of the Aircraft at the Forward Jacking Point, MLG Wheels on the Ground
TASK 07-11-00-586-001-A	Lowering of the Aircraft at Forward Jacking Point, MLG Wheels on the Ground
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 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 29-10-00-863-001-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 32-00-00-081-001-A	Removal of the Safety Devices from the Landing Gears
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 32-00-00-860-001-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 32-22-00-820-001-A	Adjustment of the NLG doors
NLG Doors - Clearances ** ON A/C NOT FOR ALL
NLG Doors - Mismatches ** ON A/C NOT FOR ALL
NLG Doors - Clearances ** ON A/C NOT FOR ALL
NLG Doors - Gaps ** ON A/C NOT FOR ALL
NLG Doors - Longitudinal and Transversal Mismatches of the NLG Doors ** ON A/C NOT FOR ALL
NLG Doors - Longitudinal and Transversal Dimensions

3. Job Set-up

NOTE: This Task can contribute to fuel savings.

Subtask 32-22-00-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(2) On the panel 400VU:

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

(3) On the panel 110VU:

make sure that the free fall control handle is folded into the center console,
put WARNING NOTICE(S) in position to tell persons not to operate the free fall control handle.

(4) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
(5) Make sure that a 460005835 SLEEVE - GROUND LOCK is installed on each MLG door (Ref. AMM TASK 32-00-00-481-002).
(6) Obey the flight configuration precautions (Ref. AMM TASK 32-00-00-860-001).
(7) Lift the aircraft at the forward jacking point (Ref. AMM TASK 07-11-00-581-003).
(8) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
(9) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 32-22-00-865-050-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34

Subtask 32-22-00-867-052-A

C. Retract the NLG and close the NLG doors

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR ARE CLEAR.

(1) Use the TIE WRAP(S) to install the 98F32304000000 TARGET-FALSE on:

Left MLG extension proximity-sensors 21GA and 23GA
Right MLG extension proximity-sensors 20GA and 22GA.

(2) Remove the safety device from the NLG (Ref. AMM TASK 32-00-00-081-001).
(3) On panel 400VU, set the landing gear control-lever (6GA) to the UP position.
(4) On the aircraft, make sure that the NLG doors are fully open and the NLG is retracted and uplocked.
(5) Use the ROD - NON METALLIC to close the MLG uplocks.
(6) On the aircraft, make sure that the NLG doors are closed and uplocked.
(7) Depressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-864-001) or (Ref. AMM TASK 29-23-00-864-001).
(8) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(9) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below zone 123.

4. Procedure
Subtask 32-22-00-220-050-A ** ON A/C NOT FOR ALL

A. Check of the NLG Doors Clearances and Mismatches
(1) Measure the NLG doors clearances and make sure that:

Dimension P is between 7.00 mm (0.2756 in.) and 9.00 mm (0.3543 in.).
Dimension Q is between 0.83 mm (0.0327 in.) and 2.83 mm (0.1114 in.).
Dimension R is between 2.50 mm (0.0984 in.) and 5.50 mm (0.2165 in.).
Dimension S is between 0 mm (0 in.) and 1.40 mm (0.0551 in.).
Dimension T is between 4.00 mm (0.1575 in.) and 6.00 mm (0.2362 in.).
Dimension U is between 8.50 mm (0.3346 in.) and 11.50 mm (0.4528 in.).
Dimension V is between 5.50 mm (0.2165 in.) and 8.50 mm (0.3346 in.).
Dimension W is between 7.50 mm (0.2953 in.) and 10.50 mm (0.4134 in.).

(2) Do a check of the NLG doors mismatches as follows:
(a) Measure mismatch X and make sure that mismatch X is between -1.00 mm (-0.0394 in.) and 1.00 mm (0.0394 in.).
(b) Measure the longitudinal mismatches and make sure that dimension L is between -2.00 mm (-0.0787 in.) and 2.00 mm (0.0787 in.).

NOTE: Dimension L between -3.00 mm (-0.1181 in.) and 3.00 mm (0.1181 in.) is permitted on a length of 378.00 mm (14.8819 in.), which is five percent of the sum of the longitudinal dimensions (dimension LL).

NLG Doors - Longitudinal and Transversal Dimensions ** ON A/C NOT FOR ALL

(c) Measure the transversal mismatches and make sure that dimension M is between -1.00 mm (-0.0394 in.) and 1.00 mm (0.0394 in.).

NOTE: Dimension M between -2.00 mm (-0.0787 in.) and 2.00 mm (0.0787 in.) is permitted on a length of 140.00 mm (5.5118 in.), which is five percent of the sum of the transversal dimensions (dimension LT).

NLG Doors - Longitudinal and Transversal Dimensions ** ON A/C NOT FOR ALL

Subtask 32-22-00-220-050-B ** ON A/C NOT FOR ALL

A. Check of the NLG Doors Clearances and Mismatches
(1) Measure the NLG doors clearances and make sure that:

Dimension P is between 7.00 mm (0.2756 in.) and 9.00 mm (0.3543 in.).
Dimension Q is between 0.83 mm (0.0327 in.) and 2.83 mm (0.1114 in.).
Dimension R is between 2.50 mm (0.0984 in.) and 5.50 mm (0.2165 in.).
Dimension S is between 0 mm (0 in.) and 1.40 mm (0.0551 in.).
Dimension T is between 4.00 mm (0.1575 in.) and 6.00 mm (0.2362 in.).
Dimension U is between 0 mm (0 in.) and 3.00 mm (0.1181 in.).
Dimension V is between 5.50 mm (0.2165 in.) and 8.50 mm (0.3346 in.).
Dimension W is between 0 mm (0 in.) and 3.00 mm (0.1181 in.).

NLG Doors - Longitudinal and Transversal Dimensions ** ON A/C NOT FOR ALL

(c) Measure the transversal mismatches and make sure that dimension M is between -1.00 mm (-0.0394 in.) and 1.00 mm (0.0394 in.).

NLG Doors - Longitudinal and Transversal Dimensions ** ON A/C NOT FOR ALL

Subtask 32-22-00-220-050-C ** ON A/C NOT FOR ALL

A. Check of the NLG Doors Clearances and Mismatches
(1) Measure the NLG doors clearances and make sure that:

Dimension P is between 7.00 mm (0.2756 in.) and 9.00 mm (0.3543 in.).
Dimension Q is between 0.83 mm (0.0327 in.) and 2.83 mm (0.1114 in.).
Dimension R is between 2.50 mm (0.0984 in.) and 5.50 mm (0.2165 in.).
Dimension S is between 0 mm (0 in.) and 1.40 mm (0.0551 in.).
Dimension T is between 4.00 mm (0.1575 in.) and 6.00 mm (0.2362 in.).
Dimension U is between 0 mm (0 in.) and 3.00 mm (0.1181 in.).
Dimension V is between 5.50 mm (0.2165 in.) and 8.50 mm (0.3346 in.).
Dimension W is between 0 mm (0 in.) and 3.00 mm (0.1181 in.).

(2) Do a check of the NLG doors mismatches as follows:
(a) Measure mismatch X and make sure that mismatch X is between -1.00 mm (-0.0394 in.) and 1.00 mm (0.0394 in.).
(b) Measure mismatch A and make sure that mismatch A is between -2.00 mm (-0.0787 in.) and 1.00 mm (0.0394 in.).
(c) Measure mismatch B and make sure that mismatch B is between -1.00 mm (-0.0394 in.) and 1.40 mm (0.0551 in.).
(d) Measure the longitudinal mismatches and make sure that dimension L is between -2.00 mm (-0.0787 in.) and 2.00 mm (0.0787 in.).

NLG Doors - Longitudinal and Transversal Dimensions ** ON A/C NOT FOR ALL

(e) Measure the transversal mismatches and make sure that dimension M is between -2.00 mm (-0.0787 in.) and 2.00 mm (0.0787 in.).

NLG Doors - Longitudinal and Transversal Dimensions ** ON A/C NOT FOR ALL

Subtask 32-22-00-820-050-A

B. NLG Doors Adjustment
(1) If necessary, adjust the NLG doors (Ref. AMM TASK 32-22-00-820-001).

5. Close-up
Subtask 32-22-00-867-053-A

A. Extend the NLG and close the NLG doors

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR ARE CLEAR.

(1) Remove the access platform(s).
(2) Pressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
(3) Energize the aircraft electrical circuits
(4) On the panel 400VU, move the landing-gear control lever 6GA to the DOWN position.
(5) On the aircraft the NLG is down and locked and the NLG doors are closed and locked up.
(6) Make sure that the MLG uplocks are open.

Subtask 32-22-00-860-051-A

B. Put the aircraft back to its initial configuration.
(1) Remove and discard the TIE WRAP(S).
(2) Remove the 98F32304000000 TARGET-FALSE from:

Left MLG extension proximity-sensors 21GA and 23GA
Right MLG extension proximity-sensors 20GA and 22GA.

(3) Install the safety device on the NLG (Ref. AMM TASK 32-00-00-481-001).
(4) Put the aircraft back to the ground configuration (Ref. AMM TASK 32-00-00-860-002).
(5) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(6) Depressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-864-001) or (Ref. AMM TASK 29-23-00-864-001).
(7) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(8) Lower the aircraft off the jack at the forward jacking point (Ref. AMM TASK 07-11-00-586-001).
(9) Make sure that the work area is clean and clear of tools and other items.
(10) Remove the WARNING NOTICE(S).
(11) Remove all the fixtures, tools, test and support equipment used during this procedure.

[Rev.10 from 2021] 2026.04.01 00:43:06 UTC