Cleaning And Corrosion Flashcards

1
Q

Is there any requirement for cleaning an aircraft prior to an annual or 100 hour inspection?

A

It is a legal requirement as specified in FAR part 43, appendix D.

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2
Q

Discuss the general precautions that should be observed when washing an airplane.

A

Avoid or protect areas, which may be damaged or contaminated, such as:

Pitot and static ports.
Hinges.
Sealed areas.
Bearings.

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3
Q

What are some of the more common light duty cleaning agents?

A

Soap.
Detergents.
Water.

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4
Q

What materials are commonly used as heavy duty cleaners?

A

Solvents
Emulsions.

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5
Q

What are the preferred cleaners for plastic surfaces such as windshields?

A

Mild soap and water.
A manufacturer approved cleaner.

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6
Q

What type of cleaning agents should be used to remove grease, oil or fuel from aircraft tires?

A

Soap and water

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7
Q

Give at least three examples of the factors that caused or influence corrosion.

A

Environmental conditions.
Dissimilar metals.
Type of metal.
Presence of electrolytes or contaminants.
Condition of protective coatings.

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8
Q

Name at least three forms of corrosion.

A

Surface.
Intergranular.
Filiform.
Dissimilar metal/galvanic.
Oxidation.
Pitting.
Stress.
Fretting.

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9
Q

Name at least one cause of filiform corrosion.

A

Improper curing of a wash primer prior to painting.
Failure to completely wash off acidic surface contamination.

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10
Q

What are the visible signs of Filliform corrosion?

A

Blistered paint surfaces.
Worm or thread, like tracks or patterns under the paint.

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11
Q

What are the two primary factors that may cause development of stress corrosion cracks?

A

A corrosive environment.
Sustained tensile stress.

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12
Q

What are the visible signs of fretting corrosion?

A

A dark smoky appearance that often appears around and streaming back from rivet heads.

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13
Q

Why are piano type hinges prime spots for corrosion?

A

The steel pin and aluminum hinge material are dissimilar metals.
The hinge design tends to trap moisture and contaminants.

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14
Q

What is the best way to protect piano hinges from corrosion?

A

Keep them clean and properly lubricated.

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15
Q

Provide at least four examples of procedures used to prevent corrosion.

A

Cleaning.
Lubrication.
Treatment.
Sealing.
Inspection.
Installing protective covers.
Keeping drainholes free and clear.

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16
Q

Describe the tools that should be used to remove corrosion from anodized aluminum surfaces.

A

Nylon scrubber pads (Scotch Brite).
Bristle brushes.
Aluminum wool.
Aluminum wire brushes.

17
Q

Describe the effects of using steel brushes or steel wool to remove corrosion from aluminum surfaces.

A

Steel particles can become embedded in the aluminum and cause corrosion.

18
Q

What is the purpose of Alodine?

A

It is a chemical process that deposits, a protective film on aluminum alloys.
It improves corrosion resistance and paint adhesion.

19
Q

For what reason should you avoid cleaning anodized aluminum surfaces with aluminum metal polish?

A

It will remove the anodized layer.

20
Q

Why should aircraft fabrics and plastics be cleaned only with recommended cleaners?

A

Recommended cleaners cause the least amount of deterioration or damage.

21
Q

List at least five examples of areas in an aircraft that are prone to corrosion.

A

Battery compartment.
Exhaust trail areas.
Bilge areas.
Vent areas.
Landing gear and wheel wells.
Fuel tanks.
Wing flap recesses.
Around and below lavatories.
Piano hinges.
Any area that can trap water.