Aircraft finishes Flashcards
Name the safety and health precautions to be observed in operating a dope room, including storage of the material
A dope room should be well lighted in ventilated using spark proof motors, lights and switches. All flammable material should be stored in fireproof containers in a protected area. Dope and paint rooms that are not located in separate buildings should be isolated from the rest of the buildings by metal partitions and fireproof doors
What primer is used when maximum protection of the material is desired
Epoxy
What type of test can be performed to identify existing paint finishes
Apply a coat of engine oil to a small area
Nitrocellulose Will soften in a few minutes, but acrylic and Epoxy will show no effect. If not identified, next wipe down a small area with MK. MEK will pick up pigment from the acrylic finish, but will not affect the epoxy coding.
What causes blushing when applying dope or lacquer, and how can it be prevented
When doping is accomplished Under humid conditions, Blushing is possible.
Rapid evaporation of thinners and solvents lower the temperature of the surface of the wet dope causing condensation of moisture from the air. The moisture causes milky white Or cloudy Appearance known as blush. The condition may be eliminated by heating the room to decrease humidity, or by using a blush retarding thinner to increase the drying time. Blushing is also caused by moisture in the air supply, drafts, or change in temperatures
What is the purpose of using functional dope when finishing Aircraft fabric
To prevent micro biological deterioration of the fabric
Rotting
What are the identification markings requirements for United States registered fix wing aircraft
The Roman capital N followed by the registration number must be displayed on both sides of the fuselage or on both sides of the vertical tail surface. Must be at least 12 inches, the characters must be 2/3 as wide as they are high except the number one which must be 1/16 as wide as it is high and the letters M and W Which may be as wide as they are high. Characters must be formed by solid lines 1/16 as thick as they are high and the spacing between each character may not be less than 1/4 of the character with
What should be the color of registration markings be
The color of markings should contrast their background
What are the two types of dope used for aircraft finishes
Nitrate and butyrate
What is the advantage of butyrate over nitrate
Less flammable
What would happen if Dope was ever used over paint or enamel
It would lift and remove such materials
What is applied to metallic surfaces as a common resistant covering before the application of Enamel or lacquer
Zinc chromate primer is normally used for this purpose
What can be done to the surface of components to prevent filiform corrosion
Ensure that the primer is completely cured
What are the most common methods of applying Aircraft finishes
They are dipping, brushing, or spraying
What type of paint maybe used over any paint system that is in good condition
Epoxy top coats will adhere to all paint systems that are in good condition and may be used as a general touchup, including touchup of defects in banked enamel coatings
What normally causes runs and sags in a spray application of paint finishes
Holding the gun too long in one place or holding a gun to close can cause too much paint to be applied to one area
