DOC AIRBUS | AMM A320FInstallation of the MLG Lock Springs
TASK 32-11-19-400-001-A
Installation of the MLG Lock Springs
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Expendable Parts
D. Referenced Information
3. Job Set-up
Subtask 32-11-19-941-055-A
Subtask 32-11-19-560-051-A
Subtask 32-11-19-942-051-A
[Rev.10 from 2021]
2026.04.01 12:30:10 UTC
Installation of the MLG Lock Springs
WARNING:
MAKE SURE THAT THE SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND RELATED DOORS
- COMPONENTS THAT MOVE.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | SAFETY BARRIER(S) |
| No specific | AR | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 0.508 and 0.34 m.daN (44.96 and 30.09 lbf.in )  | |
| No specific | Torque wrench: range to between 0.51 and 0.34 m.daN (45.13 and 30.09 lbf.in ) | |
| No specific | Torque wrench: range to between 0.95 and 0.8 m.daN (84.07 and 70.80 lbf.in ) | |
| 460005832 | 1 | SPRING EXPANDER-MLG SIDE STAY |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.03GBB1) | Synthetic Oil base Grease-General Purpose Clay Thickened - |
| (Material No.03GCB1) | Synthetic Oil base Grease-Landing Gear Wheel Bearing Lithium Thickened - |
| (Material No.03HBD9) | Synthetic Ester base Grease-General Purpose Low Temp - |
| (Material No.04QAB2) | Coating_- Flexible Structure |
| (Material No.06AAB1) | Polysulfide Sealant-General Purpose Fillet - |
| (Material No.06ACA1) | Polysulfide Sealant-Low Density Multi Purpose Brushable - |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 20 | COTTER PIN | AIPC 32-11-18-01-140 |
| 19 | NUT | AIPC 32-11-18-01-150 |
| 13 | COTTER PIN | AIPC 32-11-18-02-090 |
| 12 | NUT | AIPC 32-11-18-02-100 |
| 20 | COTTER-PIN | AIPC 32-11-85-97-140 |
| 19 | NUT | AIPC 32-11-85-97-150 |
| 13 | COTTER PIN | AIPC 32-11-85-98-090 |
| 12 | NUT | AIPC 32-11-85-98-100 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 29-23-00-860-002-A | Connection of the Isolation Coupling of the Power Transfer Unit (PTU) |
| 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 32-11-19-081-001-A | Removal of the MLG Spring-Expander Tool |
| TASK 32-11-19-481-001-A | Installation of the MLG Spring-Expander Tool |
| 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 32-31-00-720-002-A | Functional Test of the Normal Extension and Retraction of the Landing Gear |
| TASK 32-33-00-720-001-A | Functional Check of Free-Fall Extension |
| TASK 12-22-00-00 | LUBRICATION - DESCRIPTION AND OPERATION |
MLG LockspringsSubtask 32-11-19-941-055-A
A. Safety Precautions
(1) Make sure that the SAFETY BARRIER(S) are in position.
(2) Make sure that the WARNING NOTICE(S) are in the cockpit to tell persons not to operate:
(4) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
Subtask 32-11-19-860-056-A (1) Make sure that the SAFETY BARRIER(S) are in position.
(2) Make sure that the WARNING NOTICE(S) are in the cockpit to tell persons not to operate:
- the landing gear
- the MLG doors.
(4) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
B. Aircraft Maintenance Configuration
(1) Make sure that the applicable MLG door is open (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the GROUND LOCK SLEEVE is installed on the applicable MLG door actuator (Ref. AMM TASK 32-00-00-481-002).
(3) Make sure that that the flight configurations were obeyed (Ref. AMM TASK 32-00-00-860-001).
(4) Make sure that the access platform is in position below the applicable zone 731(741).
Subtask 32-11-19-865-051-A (1) Make sure that the applicable MLG door is open (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the GROUND LOCK SLEEVE is installed on the applicable MLG door actuator (Ref. AMM TASK 32-00-00-481-002).
(3) Make sure that that the flight configurations were obeyed (Ref. AMM TASK 32-00-00-860-001).
(4) Make sure that the access platform is in position below the applicable zone 731(741).
C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
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 |
Subtask 32-11-19-560-051-A
A. Preparation for a Replacement Component
(1) If you are to install new lock springs (6) and (8):
(a) Install the new springs (6) and (8) into the lock spring guide block.
(b) Install the lock spring guide block assembly into the 460005832 SPRING EXPANDER-MLG SIDE STAY (Ref. AMM TASK 32-11-19-481-001).
Subtask 32-11-19-420-050-A ** ON A/C NOT FOR ALL (1) If you are to install new lock springs (6) and (8):
(a) Install the new springs (6) and (8) into the lock spring guide block.
(b) Install the lock spring guide block assembly into the 460005832 SPRING EXPANDER-MLG SIDE STAY (Ref. AMM TASK 32-11-19-481-001).
B. Preparation for Installation
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Examine the pins (2) and (15) and the bores of the attachment lugs for damage, cracks and corrosion.
(3) Lubricate the pins (2) and (15), the bores of the attachment lugs and the bushes of the lock spring eye-ends with:
Subtask 32-11-19-420-054-A ** ON A/C NOT FOR ALL (1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Examine the pins (2) and (15) and the bores of the attachment lugs for damage, cracks and corrosion.
(3) Lubricate the pins (2) and (15), the bores of the attachment lugs and the bushes of the lock spring eye-ends with:
- Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) or Synthetic Oil base Grease-Landing Gear Wheel Bearing Lithium Thickened - (Material No.03GCB1) .
NOTE: For lubricant grease specification and lubrication requirements, refer to (Ref. AMM D/O 12-22-00-00).
(4) Install the lock springs (6) and (8) through the lock spring guide block. Make sure that: - The fixed eye-ends are to the side-stay attachment lugs
- The free to turn eye-ends are to the center pivot attachment lugs.
C. Installation of the MLG Lock Springs
(1) Align the lock spring link with the attachment lugs, at the center-pivot attachment lugs, and install the washers (14).
(2) Make sure the head of the pin (15) points AFT and install these items together:
and install a new AIPC 32-11-18-01-140 COTTER PIN (20).
(4) Install the 460005832 SPRING EXPANDER-MLG SIDE STAY (Ref. AMM TASK 32-11-19-481-001).
(5) Install the location pin (5) through the eye-ends of the lock springs (6) and (8). Turn the location pin (5) to align the lock spring eye-ends. Remove the location pin (5).
(6) Install these items together:
(9) Install the washer (11) and the new AIPC 32-11-18-02-100 NUT (12).
(10) TORQUE the nut (12) to between 0.508 and 0.34 m.daN (44.96 and 30.09 lbf.in ) and install a new AIPC 32-11-18-02-090 COTTER PIN (13).
(11) Remove the 460005832 SPRING EXPANDER-MLG SIDE STAY (Ref. AMM TASK 32-11-19-081-001).
(12) Apply a thin layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) or Synthetic Oil base Grease-Landing Gear Wheel Bearing Lithium Thickened - (Material No.03GCB1) to the lock springs (6) and (8).
(a) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to:
Subtask 32-11-19-420-050-B ** ON A/C NOT FOR ALL (1) Align the lock spring link with the attachment lugs, at the center-pivot attachment lugs, and install the washers (14).
(2) Make sure the head of the pin (15) points AFT and install these items together:
- The pin (15)
- The lock spring (6)
- The washers (16) and (17)
- The lock spring (8)
- The washer (18)
- The new AIPC 32-11-18-01-150 NUT (19).
and install a new AIPC 32-11-18-01-140 COTTER PIN (20). (4) Install the 460005832 SPRING EXPANDER-MLG SIDE STAY (Ref. AMM TASK 32-11-19-481-001).
(5) Install the location pin (5) through the eye-ends of the lock springs (6) and (8). Turn the location pin (5) to align the lock spring eye-ends. Remove the location pin (5).
WARNING:
BE CAREFUL WHEN YOU TENSION THE LOCKSPRINGS.
(a) Adjust the 460005832 SPRING EXPANDER-MLG SIDE STAY with the driving nut (7). Align the eye-end of the lock springs (6) and (8) with the bores of the side-stay attachment lugs. (6) Install these items together:
- The pin (9)
- The washer (10)
- The lock spring (8)
- The spacer (3)
- The lock spring (6)
- The washer (4).
NOTE: If the spring expander tool is not correctly adjusted, it will not be possible to install the pin (2) easily.
NOTE: The pin (2) will push out the pin (9).
(8) Remove the bullet (1). (9) Install the washer (11) and the new AIPC 32-11-18-02-100 NUT (12).
(10) TORQUE the nut (12) to between 0.508 and 0.34 m.daN (44.96 and 30.09 lbf.in )
and install a new AIPC 32-11-18-02-090 COTTER PIN (13). (11) Remove the 460005832 SPRING EXPANDER-MLG SIDE STAY (Ref. AMM TASK 32-11-19-081-001).
(12) Apply a thin layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) or Synthetic Oil base Grease-Landing Gear Wheel Bearing Lithium Thickened - (Material No.03GCB1) to the lock springs (6) and (8).
NOTE: For lubricant grease specification and lubrication requirements, refer to (Ref. AMM D/O 12-22-00-00).
(13) Application of sealants: (a) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to:
- The ends of the pins (2) and (15)
- The nuts (12) and (19)
- The washers (11) and (18).
D. Preparation for Installation
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Examine the pins (2) and (15) and the bores of the attachment lugs for damage, cracks and corrosion.
(3) Lubricate the items that follow with Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) :
Subtask 32-11-19-420-054-B ** ON A/C NOT FOR ALL (1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Examine the pins (2) and (15) and the bores of the attachment lugs for damage, cracks and corrosion.
(3) Lubricate the items that follow with Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) :
- The pins (2) and (15)
- The bores of the attachment lugs
- The bushes of the lock spring eye-ends.
- The fixed eye-ends are to the side-stay attachment lugs
- The free to turn eye-ends are to the center-pivot attachment lugs.
E. Installation of the MLG Lock Springs
(1) Put the lock springs (6) and (8) in the 460005832 SPRING EXPANDER-MLG SIDE STAY. Make sure that the eye-ends that are free to turn are in the direction of the center-pivot attachment lugs.
(2) Align the lock spring link with the attachment lugs, at the center-pivot attachment lugs, and install the washers (14).
(3) Make sure the head of the pin (15) points AFT and install these items together:
and install the new AIPC 32-11-18-01-140 COTTER PIN (20) or AIPC 32-11-85-97-140 COTTER-PIN (20).
(5) Install the 460005832 SPRING EXPANDER-MLG SIDE STAY (Ref. AMM TASK 32-11-19-481-001).
(6) Do the steps that follow:
(a) Install the location pin (5) through the eye-ends of the lock springs (6) and (8).
(b) Turn the location pin (5) to align the lock spring eye-ends.
(c) Remove the location pin (5).
(e) Align the eye-end of the lock springs (6) and (8) with the bores of the side-stay attachment lugs.
(7) Install these items together:
(10) Install the washer (11) and the new AIPC 32-11-18-02-100 NUT (12) or AIPC 32-11-85-98-100 NUT (12).
(11) TORQUE the nut (12) to between 0.51 and 0.34 m.daN (45.13 and 30.09 lbf.in ) and install the new AIPC 32-11-18-02-090 COTTER PIN (13) or AIPC 32-11-85-98-090 COTTER PIN (13).
(12) Remove the 460005832 SPRING EXPANDER-MLG SIDE STAY, (Ref. AMM TASK 32-11-19-081-001).
(13) Application of sealants:
(a) Apply Polysulfide Sealant-Low Density Multi Purpose Brushable - (Material No.06ACA1) to:
Subtask 32-11-19-865-052-A (1) Put the lock springs (6) and (8) in the 460005832 SPRING EXPANDER-MLG SIDE STAY. Make sure that the eye-ends that are free to turn are in the direction of the center-pivot attachment lugs.
(2) Align the lock spring link with the attachment lugs, at the center-pivot attachment lugs, and install the washers (14).
(3) Make sure the head of the pin (15) points AFT and install these items together:
- The pin (15)
- The lock spring (6)
- The washers (16) and (17)
- The lock spring (8)
- The washer (18)
- The new AIPC 32-11-18-01-150 NUT (19) or AIPC 32-11-85-97-150 NUT (19).
and install the new AIPC 32-11-18-01-140 COTTER PIN (20) or AIPC 32-11-85-97-140 COTTER-PIN (20). (5) Install the 460005832 SPRING EXPANDER-MLG SIDE STAY (Ref. AMM TASK 32-11-19-481-001).
(6) Do the steps that follow:
(a) Install the location pin (5) through the eye-ends of the lock springs (6) and (8).
(b) Turn the location pin (5) to align the lock spring eye-ends.
(c) Remove the location pin (5).
WARNING:
BE CAREFUL WHEN YOU TENSION THE LOCKSPRINGS.
(d) Adjust the 460005832 SPRING EXPANDER-MLG SIDE STAY with the driving nut (7). (e) Align the eye-end of the lock springs (6) and (8) with the bores of the side-stay attachment lugs.
(7) Install these items together:
- The pin (9)
- The washer (10)
- The lock spring (8)
- The spacer (3)
- The lock spring (6)
- The washer (4).
NOTE: If the 460005832 SPRING EXPANDER-MLG SIDE STAY is not correctly adjusted, it will not be possible to install the pin (2) easily.
NOTE: The pin (2) will push out the pin (9).
(9) Remove the bullet (1). (10) Install the washer (11) and the new AIPC 32-11-18-02-100 NUT (12) or AIPC 32-11-85-98-100 NUT (12).
(11) TORQUE the nut (12) to between 0.51 and 0.34 m.daN (45.13 and 30.09 lbf.in )
and install the new AIPC 32-11-18-02-090 COTTER PIN (13) or AIPC 32-11-85-98-090 COTTER PIN (13). (12) Remove the 460005832 SPRING EXPANDER-MLG SIDE STAY, (Ref. AMM TASK 32-11-19-081-001).
(13) Application of sealants:
(a) Apply Polysulfide Sealant-Low Density Multi Purpose Brushable - (Material No.06ACA1) to:
- The ends of the pins (2) and (15)
- The nuts (12) and (19)
- The washers (11) and (18).
- The ends of the pins (2) and (15)
- The nuts (12) and (19)
- The washers (11) and (18).
F. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 32-11-19-860-061-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 |
G. Preparation for Test
(1) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
(2) If you did the flight configuration precautions, put the aircraft back to the ground configuration (Ref. AMM TASK 32-00-00-860-002).
Subtask 32-11-19-720-050-A (1) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
(2) If you did the flight configuration precautions, put the aircraft back to the ground configuration (Ref. AMM TASK 32-00-00-860-002).
H. Test
(1) Do a functional test of the MLG Normal Extension and Retraction system (Ref. AMM TASK 32-31-00-720-002).
(2) Do a functional check of the MLG Free-Fall Extension (Ref. AMM TASK 32-33-00-720-001).
5. Close-up(1) Do a functional test of the MLG Normal Extension and Retraction system (Ref. AMM TASK 32-31-00-720-002).
(2) Do a functional check of the MLG Free-Fall Extension (Ref. AMM TASK 32-33-00-720-001).
Subtask 32-11-19-942-051-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).
Subtask 32-11-19-942-059-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).
B. Removal of Equipment
(1) Remove the SAFETY BARRIER(S).
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) 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 access platform(s).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.