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18 Cards in this Set
- Front
- Back
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Identify the areas of an aircraft that are most prone to corrosion? |
Battery compartment, exhaust system and exhaust trails, wheel wells, the lower area of the belly, the piano hinges, areas of dissimilar metal contact, welded areas, inside of the fuel tanks especially integral tanks, metal fittings on high pressure stress, lavatories and food service areas |
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Where is filiform corrosion most likely to occur on an aircraft? |
Under a dense coating of topcoat such as the polyurethane caused by improper cured primer |
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Where is fretting corrosion most likely to occur on an aircraft? |
In an area where there is most likely a slight amount of movement between two components, with no way for the corrosive residue to be removed before it forms such as food service areas. |
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Where is intergranular corrosion most likely to occur on an aircraft? |
Along grain boundaries of aluminum alloy that have not been properly heat treated |
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Where is dissimilar metal corrosion most likely to occur on an Aircraft? |
Where two different types of metal come in contact with moisture present, such as in areas where nuts and bolts hold components together like piano hinges |
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Where is stress corrosion most likely to occur on an aircraft? |
On a component that is constantly under tensile stress, such as metals around holes in castings that are fitted with pressed bushings |
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What must be done to a piece of aluminum alloy to remove surface corrosion and to treat the metal to prevent further corrosion? |
Brush off the corrosion with a Bristle brush or nylon scrubber, neutralize surface with chromic acid or some type of conversion coating, protect the surface from further corrosion with a coat of paint |
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What is used to prevent corrosion from forming on structural aluminum alloy? |
Aluminum cladding or oxide coating |
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How may rust be removed from a highly stressed metal part? |
By glass bead blasting, or carefully polishing with a mild abrasive paper or by using line buffing compound on a cloth buffing wheel |
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what tools are proper for removing corrosion from aluminum alloy? |
Aluminum wool or aluminum wire brushes for severe corrosion use a rotary file |
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How should corrosion be minimized at a piano hinges? |
By keeping them as clean as practicable and lubricated with low viscosity moisture dispersing agent |
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What is used to clean transparent plastic windshields and windows of an aircraft? |
Mild soap and water |
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What is used to neutralize the electrolyte from a lead acid battery that has been spilled on an aircraft structure? |
A bicarbonate soda and water solution |
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What is used to neutralize the electrolyte from a nickel cadmium battery that has been spilled on an aircraft structure? |
A boric acid and water solution or vinegar |
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what solvent is recommended for removing grease from aircraft fabric prior to doping it? |
Methyl Ethyl Ketone MEK or lacquer thinner |
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What can be used to repair the anodized surface of an aluminum alloy part? |
Alodine or any chemical conversion coating |
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What type of device is used to remove surface corrosion from a piece of magnesium alloy? |
A stiff Hog-Bristle brush |
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how is the inside of a steel tubing protected from corrosion? |
Filled with hot Linseed oil and then drained |
