DOC AIRBUS | AMM A320FPROTECTIVE TREATMENT - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The aircraft structure is given protection against corrosion and fluids. Special attention is given to areas of high contamination, high condensation and areas where different materials touch.
On metal structure, the protective treatment protects against corrosion and damage by corrosive fluids and prevents erosion.
Composite structures have a protective treatment to protect against the effects of lightning, ultra violet rays and erosion.
The material, the function and the location of a component have an effect upon the type of protective treatment applied to a component.
When a repair or cleaning procedure removes the original surface protection the protective treatment must be renewed.
** ON A/C NOT FOR ALL The aircraft structure is given protection against corrosion and fluids. Special attention is given to areas of high contamination, high condensation and areas where different materials touch.
On metal structure, the protective treatment protects against corrosion and damage by corrosive fluids and prevents erosion.
Composite structures have a protective treatment to protect against the effects of lightning, ultra violet rays and erosion.
The material, the function and the location of a component have an effect upon the type of protective treatment applied to a component.
When a repair or cleaning procedure removes the original surface protection the protective treatment must be renewed.
2. Description
Protective Treatment Zones - Fuselage and StabilizersA. Unpainted Areas
The protective treatment build-up is not the same for all aircraft structures. The areas that are made of corrosion resistant material, or areas where the performance of the component would change, are not painted. These areas include:
The protective treatment build-up is not the same for all aircraft structures. The areas that are made of corrosion resistant material, or areas where the performance of the component would change, are not painted. These areas include:
- the leading edges of the slats and the engine inlet cowl,
- the external surfaces of the engine pylon that are made of corrosion resistant materials,
- passenger and cargo-compartment door scuff-plates,
- APU exhaust,
- angle of attack sensors and static ports.
- the leading edges of the vertical stabilizer (Ref. AMM D/O 55-32-00-00),
- the leading edges of the slats,
- the engine inlet cowl,
- the external surfaces of the engine pylon that are made of corrosion resistant materials,
- passenger and cargo-compartment door scuff-plates,
- APU exhaust,
- angle of attack sensors and static ports.
B. Aircraft Internal Areas
The internal areas of the aircraft are divided into four categories. These categories, which have different protection requirements, are as follows:
The internal areas of the aircraft are divided into four categories. These categories, which have different protection requirements, are as follows:
The internal areas of the aircraft are divided into four categories. These categories, which have different protection requirements, are as follows:
The internal areas of the aircraft are divided into four categories. These categories, which have different protection requirements, are as follows:
(1) Category A:
- Areas which have contact with air and water.
(2) Category B:
- Fuel tanks.
(3) Catagory C1:
- Areas where water/condensation is possible.
(4) Catagory C2:
- The area below STGR32 and the floor structure around the doors, galleys and toilets. Areas where contact with hydraulic fluid, lubricants and/or waste water is possible and inaccessible areas.
(5) Category A:
- Areas which have contact with air and water.
(6) Category B:
- Fuel tanks.
(7) Catagory C1:
- Areas where water/condensation is possible.
(8) Catagory C2:
- The area below STGR32 and the floor structure around the doors, galleys and toilets. Areas where contact with hydraulic fluid, lubricants and/or waste water is possible and inaccessible areas.
3. Types of Protective Treatments
A. Pretreatments
The pretreatment of a material increases the corrosion resistant properties of the material and provides a good surface for the adhesion of the paint coatings.
The chemical or galvanic applied film passivates the surface and prevents corrosion.
The pretreatment of a material increases the corrosion resistant properties of the material and provides a good surface for the adhesion of the paint coatings.
The chemical or galvanic applied film passivates the surface and prevents corrosion.
B. Paint Coatings
A layer of primer paint is applied to all of the general structure to protect it against corrosion.
The primer contains corrosion inhibitant to prevent a chemical attack from corrosive materials.
A polyurethane top layer is applied to protect the structure from chemical and mechanical damage.
A layer of primer paint is applied to all of the general structure to protect it against corrosion.
The primer contains corrosion inhibitant to prevent a chemical attack from corrosive materials.
A polyurethane top layer is applied to protect the structure from chemical and mechanical damage.
C. Special Coatings
A water repellant coating is applied in areas where water or condensation may collect.
A corrosion preventive compound is applied in areas where the structure may be effected by corrosion.
A water repellant coating is applied in areas where water or condensation may collect.
A corrosion preventive compound is applied in areas where the structure may be effected by corrosion.