Aircraft Finishes

Question 1

Name the health and safety precautions to be observed in operating a dope room, including storage of material

Answer 1

Well lighted and ventilated
stored in fireproof containers
Dope and paint rooms are in seperate building

Question 2

What primer is used when maximum protection of the metal is desired?

Answer 2

Epoxy

Question 3

What type of test can be performed to identify existing paint finishes?

Answer 3

Apply small amount on engine oil - Nitrocellulose will soften, Acrylic and epoxy will have no effect

MEK will pick up pigment from acrylic finish and not epoxy

Question 4

What causes blushing when applying dope or lacquer and how can it be prevented?

Answer 4

When doping is accomplished under humid conditions (moisture in the air supply)
Heating the room decreases humidity

Question 5

What is the purpose of using fungicidal dope when finishing aircraft fabric?

Answer 5

To prevent micro-biological deterioration (rotting) of the fabric

Question 6

What are the identification marking requirements for United States registered fixed wing aircraft?

Answer 6

Capital ‘N’
Both sides of fuselage on both sides
12 inches

Question 7

What should the color of registration markings be?

Answer 7

color markings should be contrast their background

Question 8

What are two types of dope used for aircraft finishes?

Answer 8

Nitrate and Butyrate

Question 9

What is the advantage of butyrate over nitrate?

Answer 9

Less flammable

Question 10

What would happen if dope was ever used over paint or enamel?

Answer 10

Tendency to lift and remove such materials

Question 11

What is applied to metallic surfaces as a common resistant covering before the application of enamel or lacquer?

Answer 11

Zinc Chromate primer is normally used for this purpose

Question 12

What can be done to the surface of components to prevent filiform corrosion?

Answer 12

primer is completely cured

Question 13

What are the most common methods of applying aircraft finishes?

Answer 13

dipping, brushing and spraying

Question 14

What type of paint may be used over any paint systems that is in good condition?

Answer 14

Epoxy topcoats will adhere to all paint systems

Question 15

What normally causes runs and sags in a spray application of a paint?

Answer 15

Holding the gun too long in one place or holding the gun too close

Question 16

What causes an ‘orange peel’ or ‘‘pebble’ finish?

Answer 16

Incorrect spray gun setting, incorrect air pressure, incorrect paint viscosity and holding the gun too far from the work

Question 17

What causes fisheyes in the paint?

Answer 17

Surface contamination

Question 18

What is used to thin chromate primer?

Answer 18

Toulene

Question 19

Which Federal Regulation prescribes the size and location requirements for aircraft identification numbers?

Answer 19

FAR Part 45

Question 20

What type of materials should be thoroughly protected when using paint remover?

Answer 20

Synthetic rubber surfaces, aircraft tires, fabric and acrylics

Question 21

What instructions should be followed when covering an aircraft with materials specified in STC?

Answer 21

Instructions are included in the STC

Question 22

What is the principal cause of filiform corrosion?

Answer 22

Uncured primer

Question 23

What is zinc chromate used for?

Answer 23

Primer for bare metal

Question 24

What does paint blushing look like?

Answer 24

Dull and hazy surface finish

Question 25

What causes paint dust?

Answer 25

Poor surface prep and overspray

Question 26

What types of paint are generally used on aircraft?

Answer 26

Epoxy and enamel