W DOC AIRBUS | AMM A320F

Adjustment of the MLG Door Ground-Opening System

TASK 32-12-00-820-001-A
Adjustment of the MLG Door Ground-Opening 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: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 730
ZONE: 740
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 0.33 and 0.27 m.daN (29.20 and 23.89 lbf.in ) T
98DNSA20208040
1
RIGGING PIN
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.04TMB2)
Varnish-- Electrical Bonding Structure
(Material No.05BAJ1)
Threadlocking Adhesive-- High strength -
(Material No.06AAA1)
Polysulfide Sealant_General Purpose Brushable -
(Material No.06LCG9)
Non Hardening Jointing Putty-Medium Temp. Area - -
(Material No.12ACB1)
Corrosion Preventive Compound-Heavy Duty Hard Film -
(Material No.14QFB1)
Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
730
LEFT MAIN LANDING GEAR & DOORS
740
RIGHT MAIN LANDING GEAR & DOORS
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
7
COTTER PIN
AIPC 32-31-03-50-220
12
COTTER PIN
AIPC 32-31-03-50-270
31
COTTER PIN
AIPC 32-31-03-50-270
12
COTTER PIN
AIPC 32-31-83-46-010
31
COTTER PIN
AIPC 32-31-83-46-010
7
COTTER PIN
AIPC 32-31-83-46-010
 E. 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 29-00-00-864-001-A
Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-10-00-863-001-A
Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-864-001-A
Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A
Depressurize the Yellow Hydraulic System
TASK 29-14-00-614-001-A
Depressurization of the Hydraulic Reservoirs
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 29-23-00-863-001-A
Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 32-00-00-481-001-A
Installation of the Safety Devices on the Landing Gears
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 32-12-00-710-002-A
Operational Test of the Main Landing Gear (MLG) Doors Ground-Opening-Mechanism
F MLG Door Ground-Opening System
3. Job Set-up
Subtask 32-12-00-941-054-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 the panel 400VU:
  • make sure that the landing-gear control-lever 6GA is in the DOWN position
  • put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear.
   (4) Put a WARNING NOTICE(S) in the cockpit to tell persons not to pressurize the Green and Yellow hydraulic systems.
Subtask 32-12-00-010-052-A
B. Get Access
   (1) Put the ACCESS PLATFORM 2M (6 FT) below the applicable zone 730(740).
   (2) Open the applicable main gear door (Ref. AMM TASK 32-12-00-010-001).
   (3) Make sure that the 460005835 SLEEVE - GROUND LOCK is on the applicable main gear door actuator.
Subtask 32-12-00-860-050-A
C. Aircraft Maintenance Configuration
   (1) Make sure that the Green and Yellow hydraulic systems are depressurized (Ref. AMM TASK 29-00-00-864-001) and (Ref. AMM TASK 29-10-00-864-002).
   (2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
4. Procedure
Subtask 32-12-00-820-050-A
A. Adjustment of the MLG Door Ground-Opening 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.
WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.
   (1) Preparation for adjustment:
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
     (a) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
     (b) Remove the pin (2).
     (c) Put the handle (1) to the CLOSED position and install the pin (2).
     (d) Depressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-864-001).
     (e) Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001).
     (f) Disconnect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-001).
     (g) If the bypass valve (21) was not installed:
       1 Remove and discard the cotter pin (7).
       2 Remove the nut (8), washer (6), bush (9) and bolt (10).
       3 Remove the bushes (24) and (25).
NOTE: If you installed the bypass-valve (21), the eye-end (4) and rod (15) is disconnected.
     (h) Install the 98DNSA20208040 RIGGING PIN on the bypass lever (26).
   (2) Adjustment procedure:
     (a) On the cable (3):
       1 Remove and discard the lockwire from the nut (5).
       2 Loosen the nut (5).
       3 Adjust the eye-end (4) until it aligns with the hole in the lever (11).
       4 Apply Threadlocking Adhesive-- High strength - (Material No.05BAJ1) on the bushes (24) and (25).
       5 Install the bushes (24) and (25) in the lever (11).
       6 Make sure that the eye-end (4) is in safety and you can see the threads in the witness-hole of the eye-end (4).
       7 Hold the eye-end (4) and install the nut (5).
       8 TORQUE the nut (5) to between 0.33 and 0.27 m.daN (29.20 and 23.89 lbf.in ) T.
       9 Safety the nut (5) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
       10 Apply Polysulfide Sealant_General Purpose Brushable - (Material No.06AAA1) on the bushes (24) and (25).
       11 Apply Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the bushes (24) and (25).
       12 Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the bolt (10) and the bush (9).
       13 Put the eye-end (4) in position and install the bush (9), bolt (10), washer (6) and nut (8).
       14 Safety the nut (8) with the new AIPC 32-31-03-50-220 COTTER PIN (7) or the new AIPC 32-31-83-46-010 COTTER PIN (7).
       15 Apply Corrosion Preventive Compound-Heavy Duty Hard Film - (Material No.12ACB1) to the bolt (10), washer (6), nut (8) and cotter pin (7).
     (b) On the rod (15):
       1 Remove and discard the cotter pins (12) and (31).
       2 Remove the nuts (13) and (30), washers (14) and (29), bushes (18) and (28), bolts (19) and (27) and rod (15).
       3 Remove the bushes (22) and (23).
       4 Install the 98DNSA20208040 RIGGING PIN in the uplock (20).
       5 Remove and discard the lockwire from the locknuts (16).
       6 Loosen the locknuts (16).
       7 Adjust the eye-ends (17) until they align with their related attachment holes in the uplock (20) and the bypass lever (26).
       8 Apply Threadlocking Adhesive-- High strength - (Material No.05BAJ1) on the bushes (22) and (23).
       9 Install the bushes (22) and (23) in their related attachment holes in the uplock (20) and the bypass lever (26).
       10 Make sure that the eye-ends (17) are in safety and you can see the threads in the witness-holes of the eye-ends (17).
       11 Hold the eye-ends (17) and tighten the locknuts (16).
       12 Safety the locknuts (16) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
       13 Apply Polysulfide Sealant_General Purpose Brushable - (Material No.06AAA1) on the bushes (22) and (23).
       14 Apply Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the bushes (22) and (23).
       15 Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the bolts (19) and (27), bushes (18) and (28), washer (29), nut (30) and cotter pin (31).
       16 Put the rod (15) in position and install the bushes (18) and (28), bolts (19) and (27), washers (14) and (29) and nuts (13) and (30).
       17 Safety the nuts (13) with the new AIPC 32-31-03-50-270 COTTER PIN (12) or the new AIPC 32-31-83-46-010 COTTER PIN (12).
       18 Safety the nuts (30) with the new AIPC 32-31-03-50-270 COTTER PIN (31) or the new AIPC 32-31-83-46-010 COTTER PIN (31).
       19 Apply Corrosion Preventive Compound-Heavy Duty Hard Film - (Material No.12ACB1) to the bolts (19) and (27), washers (14) and (29), nuts (13) and (30) and cotter pins (12) and (31).
       20 Remove the 98DNSA20208040 RIGGING PIN from the bypass lever (26) and the uplock (20).
       21 Remove the pin (2).
       22 Put the handle (1) to the OPEN position and install the pin (2).
Subtask 32-12-00-863-053-A
B. Aircraft Maintenance Configuration
WARNING: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.
   (1) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
Subtask 32-12-00-410-052-A
C. Close Access
   (1) Remove the pin (2). Move the handle (1) through its travel range and make sure that:
  • the system can move freely
  • the system linkage does not touch other parts of the structure.
   (2) Put the handle (1) to the OPEN position and install the pin (2).
   (3) Make sure that the work area is clean and clear of tools and other items.
   (4) Close the applicable main gear door (Ref. AMM TASK 32-12-00-410-001).
   (5) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
Subtask 32-12-00-710-053-A
D. Test
   (1) Do an operational test of the MLG doors ground-opening system (Ref. AMM TASK 32-12-00-710-002).
5. Close-up
Subtask 32-12-00-942-056-A
A. Removal of Equipment
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the SAFETY BARRIER(S).
   (3) Remove the WARNING NOTICE(S).
   (4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
[Rev.10 from 2021] 2026.04.01 00:41:13 UTC
"Aviabrain" 2025