DOC AIRBUS | AMM A320FAdjustment of the NLG Free-Fall Extension Cable System
TASK 32-33-00-820-001-A
Adjustment of the NLG Free-Fall Extension Cable System
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 32-33-00-941-056-A
Subtask 32-33-00-942-053-A
[Rev.10 from 2021]
2026.04.01 12:31:19 UTC
Adjustment of the NLG Free-Fall Extension Cable System
WARNING:
PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
1. Reason for the Job- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | CABLE TENSIOMETER |
| 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 |
| 460005835 | 2 | SLEEVE - GROUND LOCK |
| 98A27901002000 | 1 | PIN-RIGGING,RUDDER CONTROL |
| 98D32203502000 | 2 | SAFETY PIN - NLG DOOR |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 822 |
| 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 32-12-00-010-001-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 32-33-00-720-001-A | Functional Check of Free-Fall Extension |
| TASK 32-33-00-820-002-A | Adjustment of the NLG Free-Fall Extension Mechanical System |
NLG Free-Fall Extension - System AdjustmentSubtask 32-33-00-941-056-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:
(a) Make sure that the handle (1) is in the stowed position.
(b) Put a WEDGE - NON METALLIC at each side of the handle (1), to keep it in position and prevent its movement.
Subtask 32-33-00-010-052-A (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.
(a) Make sure that the handle (1) is in the stowed position.
(b) Put a WEDGE - NON METALLIC at each side of the handle (1), to keep it in position and prevent its movement.
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 MLG doors (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that a 460005835 SLEEVE - GROUND LOCK is installed on each MLG door actuating cylinder (Ref. AMM TASK 32-00-00-481-002).
(5) Open the lateral avionics-compartment door 822.
Subtask 32-33-00-869-066-A (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 MLG doors (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that a 460005835 SLEEVE - GROUND LOCK is installed on each MLG door actuating cylinder (Ref. AMM TASK 32-00-00-481-002).
(5) Open the lateral avionics-compartment door 822.
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 32-33-00-865-055-A (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.
D. Open, safety and tag this(these) circuit breaker(s):
4. Procedure| 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 |
CAUTION:
MAKE SURE THAT THE FREE-FALL EXTENSION CABLES ARE ADJUSTED CORRECTLY.
INCORRECT ADJUSTMENT OF THE CABLES CAN CAUSE THE FREE-FALL EXTENSION SYSTEM TO BE UNSERVICEABLE.
Subtask 32-33-00-820-050-A A. Adjustment of the NLG Free-Fall Extension Cable System
(1) Put in the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 3. Make sure that the bellcrank is locked.
(3) Make sure that a 98D32203502000 SAFETY PIN - NLG DOOR is installed in each NLG door.
(4) Make sure that the MLG doors are open (Ref. AMM TASK 32-12-00-010-001).
(5) Make sure that a 460005835 SLEEVE - GROUND LOCK is installed on each MLG door.
(6) To adjust the cables (2) and (3):
(a) Attach the CABLE TENSIOMETER to the cable (3) at position A in the lateral avionics-compartment, zone 125, 126. Make sure that the tensiometer is attached a minimum of 80 mm (3.1496 in.) away from pulleys and turnbuckles.
(b) Get the ambient temperature and the temperature of the underfloor area.
(c) Remove the two locking clips (10) from the turnbuckle body (9) between the cables (2) and (3).
(d) Plot the ambient and underfloor temperature points on the graph and find the correct tension value.
(f) Release the tensiometer.
(g) Operate the tensiometer and make sure that it shows the correct value from the graph. If you do not get the correct value, adjust the turnbuckle body (9), until the value is correct.
(h) Safety the ends of the cables (2) and (3) and the turnbuckle body (9) with the two locking clips (10).
(7) To adjust the cables (4) and (5):
(a) Do the procedure as for the cables (2) and (3).
(8) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 3.
(9) Remove the WEDGE - NON METALLIC from each side of the GEAR GRAVITY EXTN operating handle (1).
Subtask 32-33-00-865-056-A (1) Put in the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 3. Make sure that the bellcrank is locked.
NOTE: If the rigging pin cannot be installed, adjust the NLG mechanical system (Ref. AMM TASK 32-33-00-820-002).
(2) Make sure that the NLG doors are open (Ref. AMM TASK 32-22-00-010-001). (3) Make sure that a 98D32203502000 SAFETY PIN - NLG DOOR is installed in each NLG door.
(4) Make sure that the MLG doors are open (Ref. AMM TASK 32-12-00-010-001).
(5) Make sure that a 460005835 SLEEVE - GROUND LOCK is installed on each MLG door.
(6) To adjust the cables (2) and (3):
(a) Attach the CABLE TENSIOMETER to the cable (3) at position A in the lateral avionics-compartment, zone 125, 126. Make sure that the tensiometer is attached a minimum of 80 mm (3.1496 in.) away from pulleys and turnbuckles.
(b) Get the ambient temperature and the temperature of the underfloor area.
(c) Remove the two locking clips (10) from the turnbuckle body (9) between the cables (2) and (3).
(d) Plot the ambient and underfloor temperature points on the graph and find the correct tension value.
NOTE: When the points of the ambient temperature and the underfloor temperature meet between the given lines of tension, then the correct tension reading will be calculated by linear extrapolation. (See the example on the graph).
(e) Operate the tensiometer. If necessary, adjust the turnbuckle body (9), until the tensiometer shows the same value as you find on the graph. (f) Release the tensiometer.
(g) Operate the tensiometer and make sure that it shows the correct value from the graph. If you do not get the correct value, adjust the turnbuckle body (9), until the value is correct.
(h) Safety the ends of the cables (2) and (3) and the turnbuckle body (9) with the two locking clips (10).
NOTE: If necessary, increase the cable tension to align the locking clips (10) and the turnbuckle body (9). Do not decrease the cable tension to align the locking clips (10) and the turnbuckle body (9).
(i) Remove the tensiometer. (7) To adjust the cables (4) and (5):
(a) Do the procedure as for the cables (2) and (3).
(8) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 3.
(9) Remove the WEDGE - NON METALLIC from each side of the GEAR GRAVITY EXTN operating handle (1).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 32-33-00-710-052-A | 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 |
C. Free Fall Extension System Operation
(a) For one full cycle, on panel 110VU:
(a) Put the handle (1) in the stowed position.
(b) Put a WEDGE - NON METALLIC at each side of the handle (1), to keep it in position and prevent its movement.
Subtask 32-33-00-860-075-A 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) To let the cables and linkages become stable, operate the free-fall extension system through ten full cycles: (a) For one full cycle, on panel 110VU:
- Operate the GRAVITY GEAR EXTN handle three turns in a clockwise direction at a rate of one turn every five seconds
- Operate the GRAVITY GEAR EXTN handle three turns in a counter-clockwise direction at a rate of one turn every five seconds.
(a) Put the handle (1) in the stowed position.
(b) Put a WEDGE - NON METALLIC at each side of the handle (1), to keep it in position and prevent its movement.
D. Aircraft Maintenance Configuration
(1) Put in the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 3. Make sure that the bellcrank is locked.
Subtask 32-33-00-820-074-A (1) Put in the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 3. Make sure that the bellcrank is locked.
NOTE: If the rigging pin cannot be installed, adjust the NLG mechanical system. (Ref. AMM TASK 32-33-00-820-002).
E. Adjustment of the NLG Free-Fall Extension Cable System
(1) Adjust the NLG free-fall cables again, as specified in Para. 4.A.
(2) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 3.
(3) Remove the WEDGE - NON METALLIC from each side of the GEAR GRAVITY EXTN operating handle (1).
Subtask 32-33-00-869-067-A (1) Adjust the NLG free-fall cables again, as specified in Para. 4.A.
(2) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 3.
(3) Remove the WEDGE - NON METALLIC from each side of the GEAR GRAVITY EXTN operating handle (1).
F. 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 32-33-00-410-052-A (1) If you did the flight configuration precautions, put the aircraft back to the ground configuration (Ref. AMM TASK 32-00-00-860-002).
G. 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) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(4) Close the lateral avionics-compartment door 822.
Subtask 32-33-00-720-052-A (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) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(4) Close the lateral avionics-compartment door 822.
H. Test
5. Close-upCAUTION:
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) Do a functional test of the landing-gear free-fall extension system (Ref. AMM TASK 32-33-00-720-001). Subtask 32-33-00-942-053-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.
(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.