Answers - Aircraft Painting

Fill in the Blanks

1. weight, integrity
2. Polyurethane
3. Dipping, brushing, and spraying
4. spray gun with integral paint container, spray gun with pressure pot
5. siphon feed gun, gravity feed gun, HVLP gun
6. internal, air, fluid
7. preparation
8. upper
9. Crosscoat
10. 50%
11. thinner, reducer
12. loose nozzle, clogged, packing
13. milky haze
14. trapped solvents, air, moisture
15. too much, too close, too slowly
16. bumpy
17. small holes
18. trapped solvents, unequal drying
19. too far, air pressure
20. 3 times

True or False

1. true
2. true
3. false; bright yellow
4. false; if the paint materials are too thin
5. true; 65% or more paint is transferred with HVLP spray gun.
6. false. A HVLP spray gun is an internal mix gun.
7. true
8. true
9. false. alodine is used to etch the aluminum material
10. true
11. false; if the spray pattern is offset to one side, the air port in the air cap or the ports in the horn may be plugged
12. true
13. false; first spray the corners and gaps
14. true
15. true
16. false; ensure the surface is clean
17. false; “N”
18. false; 12” high
19. false; it is old nitrocellulose finish
20. true

Knowledge Application

1. Primers, enamels, urethanes (polyurethane), and epoxies.
2. Environmental concerns; more effective primer formulas.
3. The spray pattern is offset to one side.
4. Bond to the surface, inhibit corrosion, and provide an anchor point for the finish coat
5. The use of respiratory protection such as fresh air supply or respirator. The use of protective clothing and gloves.
6. Dipping, brushing, and spraying.
7. Incorrect air pressure or the distance of the gun from the work is too large.
8. Too much paint being applied or gun too close to surface.
9. Incorrect paint viscosity, air pressure, gun setting, or distance of the gun from the work.
10. Clouding or blooming of the film.
11. Moisture in the air supply, adverse humidity, or changes in temperature.
12. Orange peel or pin holes due to too fast drying of paint.
13. Synthetic rubber products, composites, fabric, acrylics, and bonded surfaces.
14. It helps to eliminate general corrosion problems.
15. Polyurethane finishing system
16. Use a paint stripper, Plastic blast medium, or mechanical sanding (composite aircraft)
17. Open air valve all the way, set fluid valve to dial 4. Practice on a piece of masking paper and check if the fan shape and amount of paint applied are correct. Close the air valve if a smaller fan shape is required and open the fluid valve if more paint is required. Adjust both valves till the correct settings are achieved before starting the painting process.
18. A loose nozzle, clogged vent hole on the supply cup, or the packing may be leaking around the needle.
19. To ensure that the surface is clean and free from any type of contamination.
20. On the vertical tail surface or on the side of the fuselage.

Multiple Choices

1. b
For 12-inch characters the width will be 213 of 12, which equals 8 inches. The 1 will be 2 inches wide, and the spacing will be 114 of 8 inches, or 2 inches. This will give us 8 +2 +2 +2 +8 +2 +8 +2 +8 +2 +8 or 52 inches.

2. a
Masking tape should not be allowed to remain on any longer than necessary. If it is difficult to remove, try to soak the tape free with aliphatic naptha.

3. b
Retarder is a special type of thinner having rich solvents. These dry very slowly and prevent the temperature drop at the surface which causes blush.

4. a
As one component of their system, wash primers use phosphoric acid to create a phosphate film on the surface of the aluminum.

5. b
Polyurethane is a two-part chemically cured finish that has a solids content of up to 60%. The high gloss that is characteristic of these finishes is due to the slow-flowing resins used.

6. a
Aluminum pigment is mixed with clear dope and applied to fabric surfaces to help combat the deterioration caused by sunlight.

7. c
Acetone is a fast-evaporating dope solvent that is suitable for removing grease from fabric prior to doping.

8. b
When dry sanding a fabric covered aircraft, be sure to electrically ground the structure. Static electricity from sanding can cause a spark to jump inside the structure and ignite volatile fumes.

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