Airframe Structures: Airframe Finishes 🔊 Flashcards
Name the safety and health precautions to be observed in operating a dope room, including storage of materials.
A dope room should be well ventilated using spark proof motors, lights, and switches. All flammable materials should be stored in fireproof containers in protected areas. Rooms that are not located in a separate building should be isolated from the rest of the building by metal partitions and fireproof doors.
What primer is used when maximum protection of the metal 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 effects. If not identified, next wipe a small area with MEK. MEK will pick up pigment from an acrylic finish but will not affect an epoxy coating.
What causes blushing when applying dope or lacquer, and how is it prevented?
When doping is accomplished under humid conditions, blushing is possible. The condition may be eliminated by heating the room to decrease humidity or using a blush-retarding thinner.
What is the purpose of using fungicidal dope when finishing aircraft fabric?
To prevent micro-biological deterioration (rotting) of the fabric.
What are the identification marking requirements for United States registered fixed wing aircraft?
The capital letter “N” followed by the registration number must be displayed on both sides of the fuselage or on both sides of the vertical tail surfaces. The height must be equal in size and at least 12 inches. Characters must be 2/3 as wide as they are tall. (1, M, and W are exceptions) Spacing may not be less than 1/4 of the character width.
What should the color of registration markings be?
Contrasting to the background color
What are 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 have the tendency to 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
What can be done to the surface of components to prevent filiform corrosion?
Ensure the primer is completely cured
What are the most common methods of applying aircraft finishes?
Dipping, brushing, or spraying
What type of paint may be used over any paint system that is in good condition?
Epoxy topcoats
What normally causes runs and sags in a spray application of a paint finish?
Holding the gun too long in one place or holding the gun too close can cause too much paint to be applied in one area.
