Cleaning and corrosion control Flashcards
Is there any requirement for cleaning an aircraft prior to an annual or 100 inspection?
Yes, in accordance with FAR part 43 appendix D
Discuss the general precautions that should be observed when washing an airplane
Avoid or protect areas which may be damaged or contaminated, such as pitot tubes and static tubes hinges, sealed areas and bearings
What are some of the more common light duty cleaning agents?
Soap or detergent and water
What materials are commonly used as heavy duty cleaners
Solvents, and emulsions
What are the preferred cleaners for plastic surfaces such as windshields?
Mild soap in water or manufacture, approved, cleaners
What type of cleaning agents should be used to remove grease oil or fuel from aircraft tires?
Soap and water
Give examples of the factors that cause or influence corrosion
Environmental conditions, dissimilar metals, type of metal
Name the different types of corrosion that can be found on an aircraft
Fretting, exfoliation, filiform, pitting surface intergranular
What is the cause of filiform corrosion
Improper or incomplete, caring of a wash primer prior to painting
What is a visible signs of filiform corrosion?
Blistered paint surfaces
What are the two primary factors that may cause development of stress corrosion
It corrosive environment and sustained tensile stress
What are the areas of an aircraft that are prone to corrosion?
Battery compartments, bag bin, galleys, landing gear, wing flap, lavatories, end, any areas that can and trap water
What is another name for corrosion caused by contacted dissimilar metals
Galvanic corrosion
The lifting and flaking of a metal surface due to the buildup of corrosion products as a result of severe intergranular corrosion is an indication of what form of corrosion
Exfoliation
What are the visible signs of fretting corrosion?
The corrosion residue has a dark, smoky appearance streaming back from rivet heads
What type of corrosion causes a smoking rivet?
Fretting corrosion
What is the most common type of corrosion?
Surface corrosion
What form or corrosion is an attack along the grain boundaries of an alloy that is usually caused by improper heat treatment
Intergranular corrosion
What type of corrosion can be found in battery compartment?
Direct, chemical, attack or chemical corrosion
Where is stress corrosion most likely to occur on an aircraft
In any metal component that is continually under a tensile stress, the metal around holes in casting that are fitted with pressed and bushings are suspectible to stress corrosion
Where is intergranular corrosion most likely to occur on an aircraft
A long grain boundaries of aluminum alloys that have been improperly he treated. Extruded aluminum alloy suspectible to intergranular corrosion.
Why are piano type hinges prime spots for corrosion?
The steel pin an aluminum hinge material are dissimilar metals in the hinge design tends to trap, moisture and contaminants
What is the best way to protect piano hinges from
Keep them clean and properly lubricated
What are corrosion preventative measures for aircraft?
Cleaning, lubrication treatment, sealing, inspection
Describe the tools that should be used to remove corrosion from anodized aluminum surfaces
Nylon scrub pads such a scotch Brite bristle brushes, aluminum wool aluminum wire brush
Describe the tools that should be used to remove corrosion from titanium
Stainless steel wool or brushes, scotch, bright, abrasive blast with glass beads
What is the purpose of Alodine
Alodine is a chemical process that deposits, a protective film on aluminum alloys the film improves, corrosion resistance, and paint adhesion
For what reason should you avoid cleaning anodized aluminum services with aluminum metal polish?
Aluminum metal polish should not be used on anodize aluminum surfaces because it will remove the anodized coating
Why should aircraft fabrics in plastics be cleaned only with recommended cleaners
Recommended cleaners cause the least amount of deterioration or damage
Describe the effects of using steel brushes or steel wool to remove corrosion from aluminum surfaces
Steel brushes or steel wool must not be cleaned Aluminum because the steel particles can be embedded in the aluminum and cause corrosion
How was the inside of a structural steel tubing protected from corrosion?
The tubing is filled with hot linseed oil and then drained
What are the two types of surface treatments used on aluminum surfaces
Anodizing in anodizing
What can be used to repair the anodize surface on an aluminum alloy part?
Chemical conversion coding, such as Alodine
What solvent is recommended for removing grease from aircraft fabric prior to doping it
(MEK) methyl ethyl ketone or lacquer thinner
What is used to neutralize the electrolyte from a lead acid battery that has been spilled on an aircraft structure
Is solution of boric acid and water or vinegar
