Adjustment of the NLG Free-Fall Extension Mechanical System

TASK 32-33-00-820-002-A
Adjustment of the NLG Free-Fall Extension Mechanical System

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.

CAUTION: MAKE SURE THAT THE RIGGING PINS ARE REMOVED BEFORE OPERATION OF THE FREE FALL SYSTEM. DAMAGE WILL OCCUR IF THE RIGGING PINS ARE INSTALLED DURING SYSTEM OPERATION.

1. Reason for the Job
Self Explanatory

NOTE: Adjustment of the free-fall system must be made with the aircraft weight on the landing gear (weight-on-wheels).

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

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)
No specific	2	WEDGE - NON METALLIC
No specific	Torque wrench: range to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in )
98A27901002000	1	PIN-RIGGING,RUDDER CONTROL
98A32301000000	3	RIGGING PIN

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210FF, 210JF, 211FF, 211JF, 822

D. 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 32-00-00-481-002-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 32-22-00-010-001-A	Nose Gear Doors - Ground Doors Opening
TASK 32-22-00-410-001-A	Nose Gear Doors - Ground Doors Closing
TASK 32-33-00-720-001-A	Functional Check of Free-Fall Extension
TASK 32-33-00-820-001-A	Adjustment of the NLG Free-Fall Extension Cable System
TASK 53-12-11-000-001-A	Removal of the Cockpit Floor Panels from FR1 thru FR12
TASK 53-12-11-400-001-A	Installation of the Cockpit Floor Panels from FR1 thru FR12
NLG Free-Fall Extension - System Adjustment
Forward-Fuselage Floor Panels
NLG Cable-Tension Graph

3. Job Set-up
Subtask 32-33-00-941-057-A

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) in position.
(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, install a WEDGE - NON METALLIC each side of GRAVITY GEAR EXTN handle (1), to lock the handle in position.

Subtask 32-33-00-010-053-A

B. Get Access
(1) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(2) Make sure that a 98D32203502000 SAFETY PIN - NLG DOOR is installed in each NLG door (Ref. AMM TASK 32-00-00-481-002).
(3) Open the lateral avionics-compartment door 822.
(4) Remove the cockpit floor panels 211FF 211JF (Ref. AMM TASK 53-12-11-000-001).
(5) On the panel 110VU, make sure that the GRAVITY GEAR EXTN handle is folded into the center console.

Subtask 32-33-00-869-068-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 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 32-33-00-865-057-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 32-33-00-820-051-A

A. Adjustment of the NLG Free-Fall Extension Mechanical System

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.

(1) Remove the locking clips (10) from the turnbuckle bodies (9) on the cables (2), (3), (4) and (5).
(2) Turn the two turnbuckle bodies (9) to release the tension in the cables.
(3) Adjust the normal-stop screw (13):
(a) Cut and remove the lockwire from the nut (12). Discard the lockwire.
(b) Loosen the nut (12).
(c) Loosen the normal-stop screw (13) until it moves away from the quadrant (11).
(d) Adjust the normal-stop screw (13) until it touches the quadrant (11).
(e) Tighten the nut (12) to keep the normal-stop screw (13) in position.
(f) Make sure that the normal-stop screw (13) touches the quadrant (11).
(g) Safety the nut (12) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.

Subtask 32-33-00-480-057-A

B. Installation of the Rigging Pins
(1) Put in the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 3. Make sure that the bellcrank is locked.

NLG Free-Fall Extension - System Adjustment

(2) Put in the 98A32301000000 RIGGING PIN at position Pin 2. Make sure that the vent-valve input-lever is locked.

NLG Free-Fall Extension - System Adjustment

Subtask 32-33-00-820-072-A

C. Rod Adjustment

(1) If it is necessary to adjust the adjustable rod (connected to the related lever) so that you can install the rigging pin:
(a) Cut and remove the lockwire from the nuts (6) and the washers (7) at each end of the rod (8). Discard the lockwire.
(b) Loosen the two nuts (6).
(c) Adjust the rod (8) so that you can put in the rigging pin.
(d) Inspect the inspection holes in the ends of the rod (8). Make sure that they are blocked. This can be done with a short length of lockwire.
(e) TORQUE the nuts (6) to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in )

.
(f) Safety the nuts (6) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.

Subtask 32-33-00-480-058-A

D. Installation of the Rigging Pins
(1) Put in the 98A32301000000 RIGGING PIN at position Pin 1. Make sure that the gear-uplock input-lever is locked.
(a) To get the rigging pin in, adjust the rod connected to the gear-uplock input-lever, if necessary.
(2) Put in the 98A32301000000 RIGGING PIN at position Pin 4. Make sure that the door-uplock input-lever is locked.
(a) To get the rigging pin in, adjust the adjustable rod connected to the door-uplock torque-tube.

Subtask 32-33-00-820-073-A

E. Adjustment of the Cables
(1) Keep the four rigging pins in position.
(2) Adjust the tension of the cables (2), (3), (4) and (5) (Ref. AMM TASK 32-33-00-820-001), but do not do a functional test.
(3) Safety the ends of the cables (2), (3), (4) and (5) and the turnbuckle bodies (9) with the locking clips (10).

Subtask 32-33-00-860-068-A

F. Aircraft Maintenance Configuration
(1) Remove the rigging pins at positions Pin 1, Pin 2, Pin 3 and Pin 4.
(2) On the panel 110VU:
(a) Remove the WEDGE - NON METALLIC from each side of the GEAR GRAVITY EXTN handle (1).
(b) Release the handle (1) from the center console and turn it clockwise three turns.
(c) Fold the handle (1) into the center console and lock it with a wedge on each side.

Subtask 32-33-00-820-052-A

G. Adjustment of The Unlocked-stop Screw

(1) Cut, remove and discard the lockwire from the nut (15).
(2) Loosen the nut (15).
(3) Loosen the unlocked-stop screw (14) until it moves away from the quadrant (11).
(4) Adjust the unlocked-stop screw (14) until it touches the quadrant (11).
(5) Tighten the nut (15) to keep the unlocked-stop screw (14) in position.
(6) Make sure that the unlocked-stop screw (14) touches the quadrant (11).
(7) Safety the nut (15) with the 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(8) On panel 110VU, remove the WEDGE - NON METALLIC from each side of the GRAVITY GEAR EXTN handle (1).
(9) Release the GRAVITY GEAR EXTN handle (1) from the center console and turn it counterclockwise three turns.

Subtask 32-33-00-820-053-A

H. Rigging Check
(1) Do this check to make sure that the system is correctly rigged:
(a) Operate the GRAVITY GEAR EXTN handle (1) and turn it as follows:

Clockwise three turns
Counterclockwise three turns
This gives one complete cycle.

(b) Operate the GRAVITY GEAR EXTN handle (1) through ten cycles. At the same time make sure that the rods do not touch the structure.
(c) Fold the GRAVITY GEAR EXTN handle (1) into the center console with the free-fall system in the locked position.
(d) Make sure that the 98A27901002000 PIN-RIGGING,RUDDER CONTROL can be freely and easily installed and removed at position Pin 3.
(2) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 3.

Subtask 32-33-00-865-058-A

I. 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 32-33-00-869-069-A

J. 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 32-33-00-410-054-A

K. 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).
(3) Install the cockpit floor panels 210FF 210JF (Ref. AMM TASK 53-12-11-400-001).
(4) Close the lateral avionics-compartment door 822.

Subtask 32-33-00-720-053-A

L. Test
(1) Do a functional test of the free-fall extension system (Ref. AMM TASK 32-33-00-720-001).

5. Close-up
Subtask 32-33-00-942-055-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 12:29:51 UTC