Cleaning and Corrosion control ( G )

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

be sure to review FAR part 43, appendix D

What precautions should be taken when cleaning an aircraft?

avoid/protect any areas that may be damaged or contaminated while washing

What are some more common light-duty cleaning agents?

Soap detergents and water

what materials are commonly used as heavy duty cleaners

solvents and emulsions

what are the preferred cleaners for plastic surfaces such as wind shields

mild soap and water or a manufacturer approved cleaner

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

soap and water

Give at least 3 examples that cause/influence corrosion

environmental conditions, presence of dissimilar metals, and the type of metal

name three forms of corrosion

surface, intergrainular, and filiform

Name at least one cause of filiform corrosion

improper wiring of wash primer prior to painting

what are the visible signs of filiform corrosion

blistered paint surfaces or worm or thread like tracks or patterns under the paint

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

a corrosive environment and sustained tensile stress

what are the visible signs of fretting corrosion

the corrosion residue has dark, smoky appearance and appears around rivet heads

why are piano-the hinges prime spots for corrosion

the steel pin and aluminum hinge material are dissimilar metals and the hinge design tends to trap moisture

what is the best way to protect piano hinges from corrosion

keep them clean and properly lubricated

provide at least four examples of procedures used to prevent corrosion

cleaning, lubrication, treatment, and sealing

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

scotch-rite, bristle brushes, aluminum wool

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

steel brushes/wool can’t be used to clean aluminum because steel particles can become embedded in the embedded in the aluminum and cause corrosion

what is the purpose of Alodine

alodine deposits a protective film on aluminum alloys that improves corrosion resistance and paint adhesion

why should you avoid cleaning anodized aluminum surfaces with aluminum metal polish

aluminum metal polish should not be used on anodized aluminum surfaces because it will remove the film

why should aircraft fabrics and plastics be cleaned only with recommended cleaners

recommended cleaners cause the least amount of deterioration or damage

list 5 areas that are prone to corrosion

battery compartments, fuel tanks, exhaust trail areas, piano hinges, and lavatory areas