Adjustment of the MLG Free-Fall Extension Mechanical System

TASK 32-33-00-820-004-A
Adjustment of the MLG 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.

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 )
98A27801001000	1	RIGGING PIN
98A27901002000	1	PIN-RIGGING,RUDDER CONTROL
98A32301000000	1	RIGGING PIN
98DNSA20208040	1	RIGGING PIN
98DNSA20208060	4	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
211FF, 211JF, 825
131NC
131DC
131BC

D. Referenced Information

REFERENCE	DESIGNATION
TASK 07-11-00-581-001-A	Lifting for Aircraft Maintenance Operations
TASK 07-11-00-586-002-A	Lowering of the Aircraft for Maintenance Operations
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 25-54-12-000-002-A	Removal of the Ceiling Panels in the Forward Cargo Compartment
TASK 25-54-12-400-002-A	Installation of the Ceiling Panels in the Forward Cargo Compartment
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 32-12-00-010-001-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
TASK 32-33-00-200-001-A	Functional Check of Free-fall Mechanism Cable Tension
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 32-33-00-820-002-A	Adjustment of the NLG Free-Fall Extension Mechanical System
TASK 32-33-00-820-003-A	Adjustment of the MLG Free-Fall Extension Cable System
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
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
Forward-Fuselage Floor Panels
Forward Cargo-Compartment Access Panels ** ON A/C NOT FOR ALL
Forward Cargo-Compartment Access Panels ** ON A/C NOT FOR ALL
Forward Cargo-Compartment Access Panels ** ON A/C NOT FOR ALL
MLG Free-Fall Extension - System Adjustment ** ON A/C NOT FOR ALL
MLG Free-Fall Extension - System Adjustment ** ON A/C NOT FOR ALL
NLG Free-Fall Extension - System Adjustment

3. Job Set-up
Subtask 32-33-00-941-055-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 is in the DOWN position
Put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear.

(4) Make sure that the landing-gear free-fall extension system is in the locked position.
(5) On panel 110VU, lock the GRAVITY GEAR EXTN handle (18) as follows:
(a) Make sure that the handle (18) is folded into the center console.
(b) Put a WEDGE - NON METALLIC at each side of the handle (18) to keep it in position and prevent its movement.

Subtask 32-33-00-869-081-A

B. 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 32-33-00-010-055-A ** ON A/C NOT FOR ALL

C. 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.
(3) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that a 460005835 SLEEVE - GROUND LOCK is installed on the applicable MLG door actuating cylinder.
(5) Open the forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001).
(6) Remove the forward cargo-compartment ceiling panels 131BC (Ref. AMM TASK 25-54-12-000-002).
(7) Remove the cockpit floor panels 211FF 211JF (Ref. AMM TASK 53-12-11-000-001).

Subtask 32-33-00-010-055-B ** ON A/C NOT FOR ALL

C. 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.
(3) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that a 460005835 SLEEVE - GROUND LOCK is installed on the applicable MLG door actuating cylinder.
(5) Open the forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001).
(6) Remove the forward cargo-compartment ceiling panels 131NC (Ref. AMM TASK 25-54-12-000-002).
(7) Remove the cockpit floor panels 211FF 211JF (Ref. AMM TASK 53-12-11-000-001).

Subtask 32-33-00-010-055-C ** ON A/C NOT FOR ALL

C. 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.
(3) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that a 460005835 SLEEVE - GROUND LOCK is installed on the applicable MLG door actuating cylinder.
(5) Open the forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001).
(6) Remove the forward cargo-compartment ceiling panels 131BC 131DC (Ref. AMM TASK 25-54-12-000-002).
(7) Remove the cockpit floor panels 211FF 211JF (Ref. AMM TASK 53-12-11-000-001).

Subtask 32-33-00-865-061-A

D. 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 32-33-00-860-070-A

E. Aircraft Maintenance Configuration
(1) Make sure that the NLG cables are adjusted correctly (Ref. AMM TASK 32-33-00-820-001).
(2) Make sure that the NLG mechanical system is adjusted correctly (Ref. AMM TASK 32-33-00-820-002).

4. Procedure
Subtask 32-33-00-820-060-A

A. Adjustment of the MLG 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 (16) from the turnbuckle bodies (17) on the cables (1), (2), (3) and (4).
(2) Turn the two turnbuckle bodies (17) to release the tension in the cables.

NLG Free-Fall Extension - System Adjustment

(3) Install the rigging pins as follows:
(a) Put in the 98A32301000000 RIGGING PIN at NLG position Pin 1. Make sure that the input lever is locked.
(b) Put in the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at NLG position Pin 3. Make sure that the bellcrank is locked.

MLG Free-Fall Extension - System Adjustment ** ON A/C NOT FOR ALL

(c) Put in the 98A27801001000 RIGGING PIN at MLG position Pin 12. Make sure that the pulley is locked.
(4) To get a rigging pin in, it can be necessary to adjust the adjustable rod connected to the related component. Do this as follows:
(a) Cut and remove the lockwire from the nuts (13) and the washers (14) at each end of the rod (15). Discard the lockwire.
(b) Loosen the two nuts (13).
(c) Adjust the rod (15) so that you can put in the rigging pin.
(d) Check the inspection holes in the ends of the rod (15). Make sure that they are blocked. This can be done with a short length of lockwire.
(e) TORQUE the nuts (13) to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in )

.
(f) Safety the nuts (13) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(5) Adjust the tension of the cables (1), (2), (3) and (4), but do not do a functional test (Ref. AMM TASK 32-33-00-820-003).
(6) Remove the rigging pins that follow:

NLG Free-Fall Extension - System Adjustment

(a) 98A32301000000 RIGGING PIN at NLG position Pin 1.
(b) 98A27901002000 PIN-RIGGING,RUDDER CONTROL at NLG position Pin 3.

MLG Free-Fall Extension - System Adjustment ** ON A/C NOT FOR ALL

(c) 98A27801001000 RIGGING PIN at MLG position Pin 12.
(7) Check the tension of the cables (5) thru (12) (Ref. AMM TASK 32-33-00-200-001).
(8) If necessary, adjust the cables (5) thru (12) but do not do a functional test (Ref. AMM TASK 32-33-00-820-003).
(9) Installation of the Rigging Pins:
(a) Put in the 98DNSA20208060 RIGGING PIN at positions Pin 2 and Pin 11.
(b) Put in the 98DNSA20208040 RIGGING PIN at position Pin 10.
(10) To get the rigging pin in adjust the adjustable rod connected to the MLG vent-valve input-lever, if necessary.
(11) Put in the 98DNSA20208060 RIGGING PIN at position Pin 5.
(12) To get the rigging pin in, adjust the adjustable rod connected to the input-lever of the cut-out valve, if necessary.
(13) Put in the 98DNSA20208060 RIGGING PIN at positions Pin 6 and Pin 9.
(14) To get the rigging pin in, adjust the adjustable rod connected to the input-lever of the MLG door-uplock, if necessry.

Subtask 32-33-00-865-071-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
** 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 32-33-00-865-063-A

C. 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

Subtask 32-33-00-820-067-B

D. Continue with the Adjustment Procedure
(1) Put in the 98DNSA20208060 RIGGING PIN at positions Pin 3 and Pin 7.
(2) To get the rigging pins in, adjust the adjustable rods connected to the torque tubes, if necessary.
(3) Put in the 98DNSA20208060 RIGGING PIN at positions Pin 4 and Pin 8.
(4) To get the rigging pins in, adjust the adjustable rods connected to the input-lever of the gear-uplock, if necessary.
(5) Make sure that all the installed rigging pins can be moved freely and easily.

Subtask 32-33-00-080-056-A

E. Remove the Rigging Pins
(1) Remove the rigging pins as follows:
(a) Remove the rigging pins at positions Pin 2 thru Pin 11.

Subtask 32-33-00-820-069-A

F. Continue with the Adjustment Procedure
(1) On the panel 110VU, remove the WEDGE - NON METALLIC from each side of the GRAVITY GEAR EXTN handle (18).

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

(2) Release the GRAVITY GEAR EXTN handle (18) from the center console and turn it:

Clockwise three turns
Counterclockwise three turns.

NOTE: This gives one complete cycle.

(3) Operate the GRAVITY GEAR EXTN handle (18) through ten cycles. At the same time make sure that the mechanism does not touch the aircraft structure.

Subtask 32-33-00-865-062-A

G. 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 32-33-00-410-058-A ** ON A/C NOT FOR ALL

H. Close Access
(1) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).
(2) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(3) Install the cockpit floor panels 211FF 211JF (Ref. AMM TASK 53-12-11-400-001).
(4) Install the forward cargo-compartment ceiling-panels 131BC (Ref. AMM TASK 25-54-12-400-002).
(5) Close the forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).

Subtask 32-33-00-410-058-B ** ON A/C NOT FOR ALL

H. Close Access
(1) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).
(2) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(3) Install the cockpit floor panels 211FF 211JF (Ref. AMM TASK 53-12-11-400-001).
(4) Install the forward cargo-compartment ceiling-panels 131NC (Ref. AMM TASK 25-54-12-400-002).
(5) Close the forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).

Subtask 32-33-00-410-058-C ** ON A/C NOT FOR ALL

H. Close Access
(1) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).
(2) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(3) Install the cockpit floor panels 211FF 211JF (Ref. AMM TASK 53-12-11-400-001).
(4) Install the forward cargo-compartment ceiling-panels 131BC 131DC (Ref. AMM TASK 25-54-12-400-002).
(5) Close the forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).

Subtask 32-33-00-720-055-A

I. Test

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) Lift the aircraft on jacks (Ref. AMM TASK 07-11-00-581-001).
(2) Do a functional test of the landing-gear free-fall extension system (Ref. AMM TASK 32-33-00-720-001).
(3) Lower the aircraft off jacks (Ref. AMM TASK 07-11-00-586-002).

5. Close-up
Subtask 32-33-00-869-082-A

A. 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 32-33-00-942-059-A

B. 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 00:46:18 UTC