W DOC AIRBUS | AMM A320F

Cleaning/Painting of the Nose Gear

TASK 32-21-00-100-001-A
Cleaning/Painting of the Nose Gear

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.
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific
AR
SAFETY BARRIER(S)
No specific
AR
WARNING NOTICE(S)
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.04DME4)
Primer Epoxy Paint-- Hydraulic Fluid Resistant Landing Gear
(Material No.04JMD3)
Top Coat Polyurethane-- Decorative External Structure
(Material No.06ABA1)
Polysulfide Sealant-Fuel Tank Brushable -
(Material No.06ABB1)
Polysulfide Sealant-Fuel Tank Fillet -
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
(Material No.08BBB1)
Non Aqueous Cleaner-- Petroleum Based -
(Material No.09EBA1)
Methylene Chloride / Phenolic Stripper-General Use Process - -
(Material No.10ABC1)
Surface Pretreatment-Light Alloys Chemical Conversion Yellow -
(Material No.10BCC1)
Phosphoric Acid Surface Pretreatment-Steels Corrosion Removing & Metal Conditioning -
(Material No.10BDC2)
Phosphoric Acid Surface Pretreatment-Metals Corrosion Removing & Metal Conditioning Systems
(Material No.12ABE2)
Corrosion Preventive Compound-Water Displacing Oily Film System
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 12-22-32-640-002-A
Lubrication of Nose Landing Gear and Doors
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
F Nose Landing Gear - Basic Materials
3. Job Set-up
Subtask 32-21-00-860-050-A
A. Aircraft Maintenance Configuration
   (1) In the cockpit, on the center pedestal, make sure that:
  • the free fall control handle is in the normal position.
   (2) Make sure that the L/G normal control lever is set to DOWN.
Subtask 32-21-00-941-050-A
B. Safety Precautions
   (1) Put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear control lever.
   (2) Put the SAFETY BARRIER(S) in position to prevent access to the travel ranges of the nose gear doors.
Subtask 32-21-00-010-050-A
C. Get Access
   (1) Open the nose gear doors (Ref. AMM TASK 32-22-00-010-001).
   (2) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
Subtask 32-21-00-916-050-A
D. Installation of the Protective Coverings
   (1) You must protect these items:
  • The tires
  • All rubber items (caps, bellows)
  • The sliding assemblies
  • The hinges
  • The electrical harnesses, connectors and proximity detectors
  • The RVDT sensor boxes (3GC/4GC)
  • The nosewheel-steering deactivation electrical-box (5GC)
  • The nosewheel-steering hydraulic block (6GC)
  • The vent hole located at the top of the shock absorber.
4. Procedure
Subtask 32-21-00-110-050-A
A. Cleaning of the Nose Landing Gear
CAUTION: DO NOT USE HIGH-PRESSURE SPRAYING EQUIPMENT TO CLEAN THE LANDING GEAR AND THE LANDING GEAR BAYS. IF YOU USE HIGH-PRESSURE EQUIPMENT, THIS CAN CAUSE WATER TO GO INTO ELECTRICAL EQUIPMENT.
   (1) If there is some mud, remove it:
  • Use water to make it become soft
  • Remove it with a wooden or plastic scraper and a sponge soaked in water.
   (2) Dry the areas where you removed the mud.
   (3) Clean the landing gear assembly with the Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) . Start at the top.
NOTE: Make sure that the solvent does not go into the components (e.g. the sliding tube). Do not let solvents go on the protective covers or on the electrical wires and the connectors. (e.g. the proximity detectors).
You can clean with a sponge, a cloth, a brush or a low-pressure spray-gun.
   (4) Dry with compressed air if it is available, or use dry cloths.
   (5) Apply the Corrosion Preventive Compound-Water Displacing Oily Film System (Material No.12ABE2) evenly to the surfaces you cleaned with a spray-gun or a brush. Prevent runs.
NOTE: Obey the same precautions as for the cleaning procedure with the Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
   (6) Lubricate the clean items (Ref. AMM TASK 12-22-32-640-002).
Subtask 32-21-00-150-050-A
B. Removal of Corrosion on 7010 Aluminum Alloy. (Torque Links, Brace-Strut Upper-Arm, Barrel).
CAUTION: MAKE SURE THAT THE MATERIALS DO NOT TOUCH THE ASSEMBLY AREAS.
   (1) Treatment of areas with corrosion.
     (a) Clean the areas with corrosion with the Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
     (b) Make sure that the paint is in the correct condition and mark the area with corrosion.
     (c) Remove the paint that is not in the correct condition. Make the edges of the area with corrosion smooth with wet-and-dry emery paper.
     (d) Remove the corrosion with an emery stone.
NOTE: The depth of the material removed during the treatment must not change the mechanical strength of the part. If you are not sure, send the part to be repaired.
     (e) Fully degrease with the Non Aqueous Cleaner-General - - (Material No.08BAA9) .
   (2) Removal of Corrosion-Passivation
     (a) Pickle the surface with corrosion :
  • rub it lightly with a piece of cotton wool soaked in a solution of 50% Phosphoric Acid Surface Pretreatment-Metals Corrosion Removing & Metal Conditioning Systems (Material No.10BDC2) and 50% water.
     (b) During the deoxidation, do not let the liquid run. If it is necessary install the protective covers.
     (c) Flush with water and do the protective treatment immediately.
   (3) Protective Treatment
     (a) Prepare a solution of Surface Pretreatment-Light Alloys Chemical Conversion Yellow - (Material No.10ABC1) (35 g/liter) (6 oz/US Gal.)
     (b) Apply the solution on the surface with a clean piece of cotton wool.
     (c) Let it stay on the surface for approximately 5 minutes. Apply more solution not less that two times but do not rub.
     (d) Make sure that the solution fully covers the surface.
     (e) Flush with water. Dry with filtered compressed air. Keep for 12 hours at the ambient temperature.
NOTE: Apply the paint as soon as possible when the part is dry.
Subtask 32-21-00-150-051-A
C. Removal of corrosion on steels 35 NCD16-35CD4 and TS less than 1450 MPa.
(Rotating tube, NLG actuating cylinder, lock link, lower arm, brace-strut lower-arm).
   (1) Treatment of the areas with corrosion
  • Clean the areas with corrosion with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1)
  • Make sure that the paint is in the correct condition and mark the area of corrosion
  • Rub the oxidized areas with abrasive paper.
  • Degrease with the Non Aqueous Cleaner-General - - (Material No.08BAA9) .
NOTE: The depth of the material removed during the treatment must not change the mechanical strength of the part. If you are not sure, send the part to be repaired.
   (2) Removal of Corrosion - Passivation
  • Apply Phosphoric Acid Surface Pretreatment-Steels Corrosion Removing & Metal Conditioning - (Material No.10BCC1) with no water with a brush to the areas with corrosion until :
  • the oxide is fully changed
  • it becomes crystalline
  • Apply a protective finish by the DALIC (cadmium plating) or other method.
NOTE: Apply the paint as soon as possible when the part is dry.
Subtask 32-21-00-150-052-A
D. Removal of corrosion on steel 35NCD16-35CD4 and TS more than or equal to 1450 MPa (Integral axle/sliding rod).
   (1) Treatment of areas with corrosion
  • Clean the areas with corrosion with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1)
  • Make sure that the paint is in the correct condition and mark the areas with corrosion
  • Degrease with the Non Aqueous Cleaner-General - - (Material No.08BAA9) .
   (2) Removal of Corrosion - Passivation
  • Rub the oxidized areas with abrasive paper.
NOTE: The depth of the material removed during the treatment must not change the mechanical strength of the part. If you are not sure, send the part to be repaired.
  • Degrease with the Non Aqueous Cleaner-General - - (Material No.08BAA9)
  • Apply a protective finish by the DALIC (cadmium plating) or other method.
NOTE: Apply the paint as soon as possible when the part is dry.
Subtask 32-21-00-370-050-B
E. Touching-up Paint that is resistant to Skydrol
   (1) Preparation of the areas to be painted
     (a) Clean the surfaces to be painted with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) . Dry them with clean, filtered compressed air.
     (b) Apply the 09EBA1Methylene Chloride / Phenolic Stripper-General Use Process - - with a paint brush. If it is necessary, use a brush on the surface.
     (c) If you do this operation in a building, make sure that the work area is open to the air.
     (d) Do not let the material touch the surfaces for more than 5 hours.
CAUTION: THE MATERIAL MUST NOT TOUCH RUBBER, PLASTICS OR ASSEMBLY AREAS.
     (e) Flush with water, under pressure if it is possible until all the paint and cleaning product are removed.
     (f) Dry, then clean and degrease with a chlorine-base solvent. Make sure that the surfaces have no oxidation.
   (2) Preparation of the Paint Mixtures
     (a) Primer Primer Epoxy Paint-- Hydraulic Fluid Resistant Landing Gear (Material No.04DME4)
NOTE: You can keep the mixture for 8 hours at 20 deg.C (68 deg.F).
       1 10 parts of primer
       2 10 parts of hardener
       3 0 to 5 parts of thinner
     (b) Top-coat Top Coat Polyurethane-- Decorative External Structure (Material No.04JMD3)
NOTE: You can keep the mixture for 6 hours at 20 deg.C (68 deg.F).
       1 10 parts of primer
       2 10 parts of hardener
       3 5 to 7.5 parts of thinner
   (3) Apply the Paint
NOTE: Apply the paint with a spray gun and cover the adjacent surfaces. When it is possible, the paint and the surfaces must be at the same temperature :
15 to 25 deg.C (59 to 77 deg.F). The relative humidity must be 35 to 75%.
     (a) Apply a layer of primer. Let it dry for 4 hours minimum.
     (b) Apply a layer of top-coat. Let it dry for 24 hours before you touch it.
NOTE: The paint must dry for 8 days before it is resistant to Skydrol.
Subtask 32-21-00-914-050-A
F. Replacement of Sealants
   (1) Preparation of areas
NOTE: You must replace the sealants if they can decrease the sealing of assemblies or if they are damaged.
     (a) Make sure that there are no signs of sealant on the surface to be treated. Remove sealant with a spatula.
CAUTION: DO NOT DAMAGE THE PROTECTIVE FINISH.
     (b) Clean and degrease the paint with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
   (2) Apply sealing compounds
     (a) Use the Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) for :
  • the seals of fixed assemblies that can be damaged or not
  • the heads of bolts and nuts
       1 Mix the Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) : 100 g (0.22 lb) of compound with 10 g (0.022 lb) of activator
       2 Paint all the parts that it is necessary to paint, then apply this mixture with a brush or a spatula.
NOTE: Apply layers of 0.2 to 1 mm (0.008 to 0.039 in) thick.
       3 Let the parts dry for 24 to 36 hours.
NOTE: You can keep the material as it is or you can apply a finishing layer of paint that dries at the ambient temperature.
     (b) Use the Polysulfide Sealant-Fuel Tank Fillet - (Material No.06ABB1) to :
  • join the fixed elements
  • seal the fixed assemblies
  • the heads of bolts and nuts
  • the fixed elements that form an angle.
       1 Mix the Polysulfide Sealant-Fuel Tank Fillet - (Material No.06ABB1) : 75 g (0.165 lb) of compound with 10 g (0.022 lb) of activator.
       2 Paint all the parts that it is necessary to paint, then apply this mixture with a spatula or a caulking gun.
NOTE: Only apply layers 1 mm (0.039 in) thick
       3 Let the parts dry for 30 to 40 hours
NOTE: You can keep the material as it is or you can apply a finishing coat of paint that dries at the ambient temperature.
5. Close-up
Subtask 32-21-00-916-051-A
A. Removal of the protective coverings
   (1) Remove the protective coverings.
Subtask 32-21-00-942-050-A
B. Removal of Equipment
   (1) Remove the access platform.
Subtask 32-21-00-410-050-A
C. Close Access
   (1) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).
Subtask 32-21-00-942-051-A
D. Safety Precautions
   (1) Remove the safety barriers.
   (2) Remove the WARNING NOTICE(S).
   (3) Make sure that the work area is clean and clear of tools and other items.
[Rev.10 from 2021] 2026.04.01 04:15:26 UTC
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