Functional Test of the NLG Free-Fall Extension

TASK 32-33-00-720-004-A
Functional Test of the NLG Free-Fall Extension

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.

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	ROD - NON METALLIC
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SPRING BALANCE 5 DAN (12 LBF)
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 24-41-00-862-002-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 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
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 32-22-00-010-001-A	Nose Gear Doors - Ground Doors Opening
TASK 32-22-00-410-001-A	Nose Gear Doors - Ground Doors Closing
Free-Fall Extension - Controls and Indications

3. Job Set-up
Subtask 32-33-00-941-066-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On panel 400VU:

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

(4) On panel 110VU, make sure that the GRAVITY GEAR EXTN handle is folded into the center console.
(5) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the hydraulic systems.

Subtask 32-33-00-582-057-A

B. Aircraft Maintenance Configuration
(1) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that a GROUND LOCK SLEEVE is installed on each MLG door (Ref. AMM TASK 32-00-00-481-002).
(3) Lift the aircraft at the forward jacking point (Ref. AMM TASK 07-11-00-581-003).
(4) Remove the D23080000 PIN-GROUND LOCK,NLG from the NLG leg.

Subtask 32-33-00-869-085-A

C. Flight Configuration Precautions
(1) 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 32-33-00-865-075-A

D. 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
49VU	FWS/FWC1/SPLY	3WW	F01
** 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
121VU	EIS/FWC2/SPLY	2WW	Q07
** ON A/C NOT FOR ALL
121VU	LGCIU/BAT SPLY/SYS2	59GA	R32
121VU	LGCIU/BAT SPLY/SYS1	58GA	R31

Subtask 32-33-00-863-052-A

E. Pressurize the Hydraulic System

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001).

Subtask 32-33-00-860-071-A

F. Aircraft Maintenance Configuration
(1) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(2) On the ECAM CP, push (in) the WHEEL pushbutton switch and make sure that the WHEEL page shows on the ECAM lower DU.
(3) Make sure that the ECAM lower DU shows the landing gear extended and locked.
(4) On landing gear annunciator-panel 402VU, make sure that the three green triangles are on.

WARNING: DO NOT PUT YOUR FINGERS IN THE UPLOCK MECHANISM. THIS IS DANGEROUS.

(5) Use the ROD - NON METALLIC to close the MLG uplocks.

NOTE: It is necessary to do this procedure for each retraction sequence that you will do.

CAUTION: REMOVE THE SAFETY STAY BEFORE YOU DO THE LANDING GEAR EXTENSION AND RETRACTION TESTS. DAMAGE TO THE FUSELAGE CAN OCCUR IF THE AIRCRAFT MOVES DURING THE TESTS.

(6) Remove the safety stay at FR73/74.
(7) 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.

(8) To retract the NLG only, do the steps that follow:

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

(a) On panel 400VU, move the landing gear control-lever (6GA) to the UP position.
(b) During the NLG retraction make sure that:

The NLG doors open
The NLG leg retracts
The NLG doors close and lock
The ECAM lower DU shows the NLG leg is up and locked and the NLG doors are closed and locked
On landing gear annunciator-panel 402VU, green triangle 9GB goes off.

NOTE: During the retraction of the NLG:

The red UNLK legend comes on when the NLG is not in the same position as the selector lever
The ECAM lower DU shows the change in the NLG position and the amber L/G CTL indication.

4. Procedure
Subtask 32-33-00-720-063-A

A. Functional Test of the NLG Free-Fall Extension

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

CAUTION: DO NOT TURN THE GRAVITY GEAR EXTENSION HANDLE MORE THAN 3 FULL TURNS. THIS CAN CAUSE DAMAGE TO THE FREE FALL EXTENSION SYSTEM.

(1) NLG Free-Fall Extension Test:
(a) Set the ADIRU 1 or 3 to ON.
(b) On panel 20VU, set the applicable IR1 or IR3 selector switch to the ATT position.
(c) On panel 110VU, move the GRAVITY GEAR EXTN handle from the folded position.
(d) Connect a SPRING BALANCE 5 DAN (12 LBF) to the end of the GRAVITY GEAR EXTN handle.

NOTE: When you use the spring balance, it must:

Be pulled at 90 DEG to the radius of the GRAVITY GEAR EXTN handle at a rate of one full turn every 5 seconds
Show a force of between 0.5 daN (1.12 lbf) and 2 daN (4 lbf).

NOTE: During the test procedure, monitor the time taken for the NLG to extend and downlock. This is the time taken from release of the leg from the uplock to when the NLG lock link goes fully over center.

NOTE: During this test the ECAM will show unwanted indications, which you can ignore.

NOTE: During this test make sure that the ECAM upper display does not show the message L/G LGCIU 1 (2) FAULT.

(2) Do the test that follows:

ACTION	RESULT
1.On panel 110VU:	On the aircraft:
Turn the GRAVITY GEAR EXTN handle clockwise two full turns If the NLG doors do not fully open, help them to fully open with your hand NOTE: There are no aerodynamic effects on the doors during this test. This is why the doors do not always fully open.	At the end of the second turn the NLG doors have released and started to open
Make sure that the NLG doors are fully open, then turn the GRAVITY GEAR EXTN handle clockwise one full turn (to release the MLG and NLG legs from their uplocks)	At the end of the third turn the NLG leg has unlocked and started to extend The amber colored UP LOCK messages related to the left and right MLG go out of view from the ECAM lower DU.
Make sure that the GRAVITY GEAR EXTN handle will not turn more than 3 turns. Do not use a force of more than 2 daN (4.5 lbf) when you turn the GRAVITY GEAR EXTN handle.
2.On the aircraft: Monitor the time taken for the NLG leg to extend. NOTE: You should be on the ground when you monitor this time. This time is measured from when the NLG leg starts to move, to the end of the downlock link movement.	On the aircraft: The time taken must be 11.5 +/- 5 seconds.
	On panel 402VU: The green triangle 9GB on the L/G annunciator panel comes into view.
	On the ECAM lower DU, after 30 seconds: Two green triangles come into view The three door symbols will show doors open (amber) or doors in transit (amber).
	On the ECAM upper DU, after 30 seconds, these captions will come into view: L/G DOOR NOT CLOSED MAX SPEED 250/.60.

Subtask 32-33-00-860-072-A

B. Aircraft Maintenance Configuration

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

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

(1) Install the D23080000 PIN-GROUND LOCK,NLG on the NLG leg (Ref. AMM TASK 32-00-00-481-001).
(2) Visually examine the NLG leg to make sure that it is fully down and locked.

NOTE: The L/G doors do not close after Free-Fall operation.

(3) Remove the D23080000 PIN-GROUND LOCK,NLG from the NLG leg.
(4) On panel 400VU, move the landing-gear control-lever 6GA to the DOWN position (to reset hydraulic system).

WARNING: WHEN THE GRAVITY GEAR HANDLE IS OPERATED THE L/G DOORS WILL CLOSE.

(5) On panel 110VU:
(a) Turn the GRAVITY GEAR EXTN handle counterclockwise three full turns at a rate of one full turn every 5 seconds. The NLG doors close.
(b) Fold the GRAVITY GEAR EXTN handle into the center console.
(6) Visually examine the NLG doors to make sure that they are closed and locked.
(7) On the panel 400VU, move the landing-gear control-lever 6GA to the UP position (doors open and the NLG leg retracts).
(8) Visually examine the NLG leg to make sure that it is fully retracted and locked.
(9) Make sure that the ECAM lower DU shows that:

The NLG leg is retracted and locked
The green triangle 9GB on the L/G annunciator panel 402VU is off.

(10) On panel 400VU, move the landing-gear control lever 6GA to the DOWN position.
(11) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(12) Make sure that the ECAM lower DU shows:

The NLG leg extended and locked
The NLG doors closed and locked.

5. Close-up
Subtask 32-33-00-010-062-A

A. Get Access
(1) Install the D23080000 PIN-GROUND LOCK,NLG on the NLG leg (Ref. AMM TASK 32-00-00-481-001).
(2) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(3) Install the 98D32203502000 SAFETY PIN - NLG DOOR in each NLG door (Ref. AMM TASK 32-00-00-481-002).
(4) Make sure that the free-fall mechanism on the NLG door and gear uplocks has gone back to the normal position (system reset).
(5) Make sure the input levers of the cutout valve (2515GM) and the vent valves (2516GM, 2532GM) have gone back to the normal position.

Subtask 32-33-00-410-068-A

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

Subtask 32-33-00-860-073-A

C. Aircraft Maintenance Configuration
(1) Set ADIRU 1 or 3 to OFF.
(2) On panel 20VU, set the IR OFF/NAV/ATT switches to OFF, as applicable.
(3) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(4) Remove and discard the TIE WRAP(S).
(5) Remove the 98F32304000000 TARGET-FALSE from:

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

(6) Make sure that the work area is clean and clear of tools and other items.
(7) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(8) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 32-33-00-582-058-A

D. Lower the Aircraft
(1) Lower the aircraft off the jack at the forward jacking point (Ref. AMM TASK 07-11-00-586-001).

Subtask 32-33-00-869-086-A

E. Ground Configuration
(1) If you did the flight configuration precautions, put the aircraft back to the ground configuration (Ref. AMM TASK 32-00-00-860-002).

Subtask 32-33-00-942-067-A

F. 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 12:31:04 UTC