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ORAL General Cleaning and Corrosion Control
Terms in this set (22)
How may fretting corrosion be identified?
Pitting of mating surfaces and powdered residue.
Why is the aircraft cleaned before inspection?
Enables the mechanic to properly inspect the aircraft.
What is the principle cause of filiform corrosion?
Improper surface preparation for painting.
Why should only recommended cleaners be used on aircraft fabrics or plastics?
Their use causes less deteriorating effects.
What is the most common product used for external wash down of aircraft engines?
Why should aluminum metal polish NOT be used on anodized aluminum surfaces?
Because it will remove the oxide coating.
What type of agent is preferred for cleaning plastic surfaces?
Soap and water.
How may filiform corrosion be recognized?
Blistered paint surface and fern-like patterns under paint.
What type of aircraft parts are susceptible to stress corrosion?
Aluminum alloy bell cranks with pressed-in bushings, landing gear shock struts with pipe-thread type grease fittings, clevis pin joints, shrink fits, and over stressed "B" nuts.
What are some types of heavy duty cleaning agents?
Solvents and emulsions.
What are some types of light duty cleaning agents?
Soap and synthetic detergents.
What general precautions should be used when pressure washing an aircraft?
Avoid or protect areas which may be damaged or contaminated such as bearings, hinges, sealed areas, and painted surfaces.
What are the proper tools for removing corrosion from anodized aluminum surfaces?
Aluminum wool, aluminum brushes, or non-metallic bristle brushes.
What are the basic steps of corrosion removal and treatment?
Clean the area, remove the corrosion, neutralize the area, and restore protective surface.
What are the common causes of corrosion?
Environmental conditions, type of metal, protective coating, and presence of foreign materials.
What are some forms of corrosion?
Surface, dissimilar metal, intergranular, stress, and fretting.
What is corrosion preventive maintenance?
Cleaning, lubrication, inspection, treatment, sealing, protective covers, and drain holes.
What areas are more prone to corrosion?
Exhaust trails, battery compartments and vent openings, bilge areas, wheel well and landing gear, wing flap recesses, and other water entrapment areas.
Why are piano-type hinges prime spots for corrosion?
Piano hinges are corrosion prone due to dissimilar metal contact between the steel pin and aluminum hinge and because of their design, which tends to trap contaminants.
How are piano-type hinges protected from corrosion?
By being kept as clean as possible and properly lubricated.
What is Alodine used for?
Alodine treatment deposits a chemically formed oxide on aluminum alloys to improve corrosion resistance and enhance paint bonding qualities.
Is it permissible to use steel wool or steel wire brushes on aluminum surfaces? Explain.
It is not permissible to use steel wool or steel wire brushes on aluminum because traces of steel can become embedded in the aluminum and cause corrosion.
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