W DOC AIRBUS | AMM A320F

Installation of the MLG Lock Stay


TASK 32-11-17-400-001-A
Installation of the MLG Lock Stay


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.
MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 731
ZONE: 741
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
ACCESS PLATFORM 2M (6 FT)
No specific
AR
SAFETY BARRIER(S)
No specific
AR
WARNING NOTICE(S)
No specific
Torque wrench: range to between 0.19 and 0.12 m.daN (16.81 and 10.62 lbf.in ) T
No specific
Torque wrench: range to between 0.192 and 0.124 m.daN (16.99 and 10.97 lbf.in ) T
No specific
Torque wrench: range to between 0.192 and 0.125 m.daN (16.99 and 11.06 lbf.in ) T
No specific
Torque wrench: range to between 0.19 and 0.13 m.daN (16.81 and 11.50 lbf.in ) T
No specific
Torque wrench: range to between 0.45 and 0.29 m.daN (39.82 and 25.66 lbf.in ) T
No specific
Torque wrench: range to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in ) T
No specific
Torque wrench: range to between 0.7 and 0.46 m.daN (61.95 and 40.71 lbf.in ) T
No specific
Torque wrench: range to between 0.75 and 0.60 m.daN (66.37 and 53.10 lbf.in ) T
No specific
Torque wrench: range to between 0.95 and 0.8 m.daN (84.07 and 70.80 lbf.in ) T
No specific
Torque wrench: range to between 1.35 and 1.10 m.daN (119.47 and 97.35 lbf.in ) T
No specific
Torque wrench: range to between 4.2 and 3.6 m.daN (30.97 and 26.55 lbf.ft ) T
 B. Consumable Materials
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.05BAB1)
Threadlocking Adhesive-- Low strength Low viscosity -
(Material No.06AAB1)
Polysulfide Sealant-General Purpose Fillet -
(Material No.06AAC5)
Polysulfide Sealant-General Purpose Interfay Landing Gear
(Material No.06CMD9)
Silicone Adhesive Sealant-General Purpose One part legacy
(Material No.06LDG6)
Non Hardening Jointing Putty-High Temp. Area - Hydraulic
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
(Material No.08BBB1)
Non Aqueous Cleaner-- Petroleum Based -
(Material No.14SBA1)
Textile-Lint free Cotton -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
731
L.H MAIN GEAR
741
R.H MAIN GEAR
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
3
NUTS
AIPC 32-11-16-50-080
6
NUT
AIPC 32-11-16-50-110
25
NUT
AIPC 32-11-16-51-130
31
NUT
AIPC 32-11-16-51-130
36
COTTER-PIN
AIPC 32-11-17-01-030
35
NUT
AIPC 32-11-17-01-040
21
COTTER-PIN
AIPC 32-11-17-01-150
20
NUT
AIPC 32-11-17-01-160
44
COTTER-PIN
AIPC 32-11-18-01-030
46
COTTER-PIN
AIPC 32-11-18-01-080
47
NUT
AIPC 32-11-18-01-090
44
COTTER PIN
AIPC 32-11-18-01-140
45
NUT
AIPC 32-11-18-01-150
25
NUT
AIPC 32-11-85-95-130
31
NUT
AIPC 32-11-85-95-130
3
NUTS
AIPC 32-11-85-95-270
6
NUT
AIPC 32-11-85-95-300
36
COTTER PIN
AIPC 32-11-85-96-030
35
NUT
AIPC 32-11-85-96-040
21
COTTER PIN
AIPC 32-11-85-96-150
20
NUT
AIPC 32-11-85-96-160
46
COTTER PIN
AIPC 32-11-85-97-080
47
NUT
AIPC 32-11-85-97-090
44
COTTER PIN
AIPC 32-11-85-97-140
45
NUT
AIPC 32-11-85-97-150
 E. 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 29-00-00-864-001-A
Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A
Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-614-002-A
Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01
Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 29-23-00-860-001-A
Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 29-23-00-860-002-A
Connection of the Isolation Coupling of the Power Transfer Unit (PTU)
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 32-11-19-400-003-A
Connection of one end of the MLG Lock Springs to a MLG Side-Stay
TASK 32-31-00-720-002-A
Functional Test of the Normal Extension and Retraction of the Landing Gear
TASK 32-31-73-200-001-A
Inspection of the MLG Proximity Sensor and Target Clearances
TASK 32-31-73-400-001-A
Installation of the MLG Proximity-Sensors
TASK 32-33-00-720-001-A
Functional Check of Free-Fall Extension
TASK 12-22-00-00
LUBRICATION - DESCRIPTION AND OPERATION
3. Job Set-up
Subtask 32-11-17-941-052-A
A. Safety Precautions
   (1) Make sure that the SAFETY BARRIER(S) are in position.
   (2) Make sure that a WARNING NOTICE(S) is on the ground service connection to tell persons not to pressurize:
  • The Green hydraulic system
  • The Yellow hydraulic system.
   (3) On panel 400VU:
  • Make sure that the landing-gear control-lever 6GA is in the DOWN position
  • Make sure that the WARNING NOTICE(S) is in position to tell persons not to operate the landing gear.
Subtask 32-11-17-860-054-A
B. Aircraft Maintenance Configuration
   (1) Make sure that the ACCESS PLATFORM 2M (6 FT) is below the applicable MLG lockstay at zone 731 or 741.
   (2) Make sure that the aircraft is lifted on jacks (Ref. AMM TASK 07-11-00-581-001).
   (3) Make sure that the applicable hydraulic systems are depressurized (Ref. AMM TASK 29-00-00-864-001).
   (4) Make sure that the applicable hydraulic reservoirs are depressurized (Ref. AMM TASK 29-14-00-614-001).
   (5) Make sure that the isolation coupling of the PTU is disconnected (Ref. AMM TASK 29-23-00-860-001).
Subtask 32-11-17-865-051-A
C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUL/G/LGCIU/SYS1/NORM1GAC09
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR33
121VULGCIU/BAT SPLY/SYS158GAR32
** ON A/C ALL
121VUHYDRAULIC/LGCIU/SYS22GAQ35
121VUHYDRAULIC/LGCIU/SYS1/GRND SPLY52GAQ34
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR32
121VULGCIU/BAT SPLY/SYS158GAR31
Subtask 32-11-17-869-053-A
D. Flight Configuration Precautions
   (1) If you did not open the LGCIU circuit breakers, make sure that the electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).
4. Procedure
Subtask 32-11-17-560-050-B ** ON A/C NOT FOR ALL
A. Preparation for a Replacement Component
   (1) Apply a layer of Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the interfaces of:
  • the target bracket (4)
  • the proximity-sensor bracket (27)
  • the bracket (8).
   (2) Align the target bracket (4) and the bracket (8) on the lock stay and install these parts:
  • the bolts (10), (14) and (15)
  • the washers (2) and (5)
  • the nuts (3) and (6).
   (3) TORQUE the nuts (3) and (6) to between 0.45 and 0.29 m.daN (39.82 and 25.66 lbf.in ) T.
   (4) Align the proximity-sensor bracket (27) on the lock stay and install these parts:
  • the bolt (28), the washer (26) and the nut (25)
  • the bolt (29), the washer (30) and the nut (31).
   (5) TORQUE the nuts (25) and (31) to between 0.192 and 0.125 m.daN (16.99 and 11.06 lbf.in )
T.
   (6) Install the proximity sensor (7) (
Ref. AMM TASK 32-31-73-400-001).
Subtask 32-11-17-560-050-C ** ON A/C NOT FOR ALL
A. Preparation for a Replacement Component
   (1) Align the target bracket (4) and the bracket (8) on the lock stay and install these parts:
  • the bolts (10), (14) and (15)
  • the washers (2) and (5)
  • the nuts (3) and (6).
   (2) TORQUE the nut (6) to between 0.19 and 0.12 m.daN (16.81 and 10.62 lbf.in ) T.
   (3) TORQUE the nuts (3) to between 0.75 and 0.6 m.daN (66.37 and 53.10 lbf.in )
T.
   (4) Align the proximity-sensor bracket (27) on the lock stay and install these parts:
  • the bolt (28), the washer (26) and the nut (25)
  • the bolt (29), the washer (30) and the nut (31).
   (5) Tighten the nut (25) sufficiently.
   (6) TORQUE the bolt (29) to between 0.19 and 0.13 m.daN (16.81 and 11.50 lbf.in )
T.
   (7) Install the proximity sensor (7) (
Ref. AMM TASK 32-31-73-400-001).
   (8) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) to the areas around:
  • the target bracket (4)
  • the proximity-sensor bracket (27)
  • the bracket (8)
  • the proximity sensor (7)
  • the head of the bolts (10), (14), (15) and (29)
  • the nuts (3), (6), (25) and (31).
Subtask 32-11-17-560-050-D ** ON A/C NOT FOR ALL Subtask 32-11-17-420-052-B ** ON A/C NOT FOR ALL
B. Preparation for Installation
   (1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
   (2) Make sure that the parts retained from the removed component are clean and in the correct condition.
   (3) Do an inspection of the component interfaces and the adjacent area.
   (4) Lubricate these parts 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) :
  • The cardan joint
  • The plain shank of the pins (16), (40), (41) and (33)
  • The bores of the lock stay and the side stay
  • The bore of the lock-stay actuating-cylinder eye-end.
NOTE: For lubricant grease specification and lubrication requirements, refer to (Ref. AMM D/O 12-22-00-00).
Subtask 32-11-17-420-050-B ** ON A/C NOT FOR ALL
C. Installation of the MLG Lock Stay
   (1) Make sure that the side stay is safetied in position, the weight of the side stay is 54.8 kg (120.8 lb).
   (2) Hold and align the lock-stay eye end (18) with the cardan joint.
   (3) Install the spacers (1), the washer (17), the pin (16), the washer (19) and the nut (20).
NOTE: Install the pin (16) with the head of the pin aft.
   (4) Align the lower lock-link with the side-stay attachment lugs and install these parts:
  • The washers (38)
  • The washer (39)
  • The pin (40), with the head of the pin aft
  • The washer (48)
  • The nut (47).
   (5) Align the lockspring link with the lug on the lower lock-link and install these parts:
  • The washers (42)
  • The pin (41), with the head of the pin aft
  • The washer (43)
  • The nut (45).
   (6) TORQUE the nut (20) to between 4.2 and 3.6 m.daN (30.97 and 26.55 lbf.ft ) T. Tighten the nut (20), no more than 4.2 m.daN (30.97 lbf.ft) to align the cotter-pin hole.
   (7) Safety the nut (20) with a new
AIPC 32-11-17-01-150 COTTER-PIN (21).
   (8) TORQUE the nut (47) to between 4.2 and 3.6 m.daN (30.97 and 26.55 lbf.ft )
T and safety with a new AIPC 32-11-18-01-080 COTTER-PIN (46).
   (9) TORQUE the nut (45) to between 0.95 and 0.8 m.daN (84.07 and 70.80 lbf.in )
T and safety with a new AIPC 32-11-18-01-030 COTTER-PIN (44).
   (10) Remove the safety device from the lock-stay actuating-cylinder.
   (11) Align the lock-stay actuating-cylinder eye-end with the actuating-cylinder attachment lugs and install these parts:
  • The washers (37)
  • The washer (32)
  • The pin (33), with the head of the pin aft
  • The washer (34)
  • The nut (35).
   (12) TORQUE the nut (35) to between 0.7 and 0.46 m.daN (61.95 and 40.71 lbf.in )
T and safety with a new AIPC 32-11-17-01-030 COTTER-PIN (36).
   (13) Remove the safety device from the side stay.
   (14) Connect the locksprings at the top attachment (
Ref. AMM TASK 32-11-19-400-003).
   (15) Put the clips (11) on the electrical cable (9) and put the electrical cable (9) on the bracket (8).
   (16) Install the washers (12) and the bolts (13).
   (17) Remove the blanking caps and connect the electrical cable (9) to the proximity sensor (7).
   (18) Do the dimensional check of the proximity sensors on the lock stay (Ref. AMM TASK 32-31-73-200-001).
   (19) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to:
  • The ends of the cardan joint
  • The ends of the pins (16), (40), (41) and (33)
  • The nuts (3), (6), (20), (25), (31), (45), (47) and (35)
  • The washers (2), (5), (17), (19), (26), (30), (39), (43), (48), (32) and (34)
  • The heads of the bolts (10), (14) and (15).
   (20) Use 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 lubricate the lock-stay through the greasers.
NOTE: For lubricant grease specification and lubrication requirements, refer to (Ref. AMM D/O 12-22-00-00).
Subtask 32-11-17-420-052-E ** ON A/C NOT FOR ALL
D. Preparation for Installation
   (1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
   (2) Make sure that the parts retained from the removed component are clean and in the correct condition.
   (3) Do an inspection of the component interfaces and the adjacent area.
   (4) Apply Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) to:
  • The chromium plated diameter of the cardan joint
  • The external diameter of the pins (16), (33), (40) and (41).
   (5) Apply Non Hardening Jointing Putty-High Temp. Area - Hydraulic (Material No.06LDG6) to:
  • The threads of the pin (16)
  • The bolts (13).
   (6) Apply Threadlocking Adhesive-- Low strength Low viscosity - (Material No.05BAB1) to:
  • The connector of the electrical cable (9)
  • The threads of the bolts (13).
Subtask 32-11-17-420-050-D ** ON A/C NOT FOR ALL
E. Installation of the MLG Lock Stay
   (1) Make sure that the side-stay is safetied in position.
NOTE: The weight of the side-stay is 54.8 kg (120.8 lb).
   (2) Hold and align the lockstay eye end (18) with the cardan joint.
   (3) Install the items that follow:
   (4) Align the lower locklink with the side-stay attachment lugs and install the items that follow:
   (5) Align the lockspring link with the lug on the lower locklink and install the items that follow:
   (6) TORQUE the nut (20) to between 4.2 and 3.6 m.daN (30.97 and 26.55 lbf.ft ) T. Torque the nut (20) to 4.2 m.daN (30.97 lbf.ft) maximum to align the cotter pin hole.
   (7) Safety the nut (20) with a new
AIPC 32-11-17-01-150 COTTER-PIN (21) or AIPC 32-11-85-96-150 COTTER PIN (21).
   (8) TORQUE the nut (47) to between 4.2 and 3.6 m.daN (30.97 and 26.55 lbf.ft )
T .
   (9) safety the nut (47) with a new
AIPC 32-11-18-01-080 COTTER-PIN (46) or AIPC 32-11-85-97-080 COTTER PIN (46).
   (10) TORQUE the nut (45) to between 0.95 and 0.80 m.daN (84.07 and 70.80 lbf.in )
T.
   (11) Safety the nut (45) with a new
AIPC 32-11-18-01-140 COTTER PIN (44) or AIPC 32-11-85-97-140 COTTER PIN (44) .
   (12) Remove the safety device from the lockstay actuating-cylinder.
   (13) Align the lockstay actuating-cylinder eye-end with the actuating-cylinder attachment lugs and install the items that follow:
   (14) TORQUE the nut (35) to between 1.35 and 1.10 m.daN (119.47 and 97.35 lbf.in ) T.
   (15) Safety the nut (35) with a new
AIPC 32-11-17-01-030 COTTER-PIN (36) or AIPC 32-11-85-96-030 COTTER PIN (36).
   (16) Remove the safety device from the side-stay.
   (17) Connect the locksprings at the top attachment (
Ref. AMM TASK 32-11-19-400-003).
   (18) Put the clips (11) on the electrical cable (9) in position on the bracket (8).
   (19) Install the washers (12) and the bolts (13).
   (20) TORQUE the bolts (13) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in ) T.
   (21) Remove the blanking caps and connect the electrical cable (9) to the proximity sensor (7).
   (22) Do the dimensional check of the proximity sensors on the lockstay (
Ref. AMM TASK 32-31-73-200-001).
   (23) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) to:
  • The head of the pin (40)
  • The nuts (20), (35), (45) and (47)
  • The washers (19) and (48)
  • The cotter pin (21).
   (24) Paint a red line with Silicone Adhesive Sealant-General Purpose One part legacy (Material No.06CMD9) across the connector of the electrical cable (9) and the proximity sensor (7).
   (25) Use Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) to lubricate the lockstay through the greasers.
Subtask 32-11-17-860-052-A
F. Aircraft Maintenance Configuration
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the access platform(s).
   (3) Pressurize the hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-002).
   (4) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
Subtask 32-11-17-865-052-A
G. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUL/G/LGCIU/SYS1/NORM1GAC09
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR33
121VULGCIU/BAT SPLY/SYS158GAR32
** ON A/C ALL
121VUHYDRAULIC/LGCIU/SYS22GAQ35
121VUHYDRAULIC/LGCIU/SYS1/GRND SPLY52GAQ34
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR32
121VULGCIU/BAT SPLY/SYS158GAR31
Subtask 32-11-17-869-054-A
H. Flight Configuration Precautions
   (1) If you did not de-energize the aircraft electrical circuits, put the aircraft back to the ground configuration (Ref. AMM TASK 32-00-00-860-002).
Subtask 32-11-17-720-050-A
I. Test
   (1) Do a functional test of the normal extension and retraction of the landing gear (Ref. AMM TASK 32-31-00-720-002).
   (2) Do a functional test of the free-fall system (Ref. AMM TASK 32-33-00-720-001).
5. Close-up
Subtask 32-11-17-586-050-A
A. Lower the Aircraft
   (1) Lower the aircraft off jacks (Ref. AMM TASK 07-11-00-586-002).
Subtask 32-11-17-942-051-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 00:40:27 UTC