A&p O&p Airframe Section Iii Aircraft Finishes

Front 1

Where are the registration marks required to be placed on a fixed wing aircraft?

Back 1

On the vertical tail surface or on the side of the fuselage.

Front 2

What is the general required dimensions of registration numbers on the side of a fixed wing aircraft?

Back 2

12 in tall, 2/3 as wide as they are high. Letters m and w maybe as wide as they are high. The number one is 1/6 as wide as it is high.

Front 3

What is the regulation regarding the color of the registration marks?

Back 3

The color must contrast with the background and the legible.

Front 4

Why should wooden wings spars be finished with a transparent vanish?

Back 4

Allows decay or rot to be detected on the wood.

Front 5

Why is a retarder used in dope when the dope is being sprayed in humid conditions?

Back 5

The retarder slows the drying of the dope and keeps it from blushing.

Front 6

When an aircraft is being recovered, when is fungicidal dope applied to the fabric?

Back 6

With the first coat of dope that is brushed into the fabric.

Front 7

What will happen if dope is sprayed over an enameled surface?

Back 7

It will penetrate the enamel surface and cause it to swell.

Front 8

What are the two basic types of dope used on fabric covered aircraft?

Back 8

Nitrate and butyrate dope

Front 9

What kind of dope is used on a polyester synthetic fabric that has been heat shrunk on an aircraft structure?

Back 9

Nontautening butyrate dope.

Front 10

Why are some portions of the aircraft structure dope proofed before they are covered with fabric?

Back 10

To keep the fabric from sticking to the structure when the first coat of dope is applied.

Front 11

What is meant by dope blushing, and what causes it?

Back 11

A condition in which dope finishes has moisture from the atmosphere condensing on the surface and causes some cellulose to precipitate from the finish.

Blushing is typically caused by low temperatures or humidity being too high or by drifts or sudden changes in temperature.

Front 12

What can be done to remedy blushing that has formed on the doped surface and that's just been sprayed?

Back 12

Spray a very light mist coat of a mixture of one part retarder to two parts of thinner over the blush area.

Allow to dry, and spray yet another coat, and if it does not remove the blush then it has to be sanded off and a new dope applied.

Front 13

What is a rejuvenator?

Back 13

Slow drying finishing material that has potent solvents and plasticizers that soften a dried surface film and restore resilience to the film.

Front 14

Does rejuvenator restores strength to the fabric?

Back 14

No, it only restores resilience to the finish

Front 15

Why is the first coat of dope brushed onto the fabric?

Back 15

For thorough penetration and encapsulation of all the fibers.

Front 16

What is the general reason for runs and sags in a finish that has been sprayed unto a flat surface?

Back 16

When too much dope has been applied, or the film is to thick.

Front 17

What is the most common cause for dope roping?

Back 17

Either the dope was improperly thinned, or it was too cold.

Front 18

What causes pinkholes in a dope finish?

Back 18

Excessive atomizing air pressure on the spray gun.

Front 19

Why should the first coat of dope be thinned?

Back 19

To ensure proper penetration and encapsulation of all the fibers.

Front 20

Why is aluminum pigmented dope used on a fabric-covered aircraft?

Back 20

To protect the clear dope and the fabric from the harmful effects of the Sun.

Front 21

What safety precaution must be observed when sweeping a paint room that has dried dope or lacquer over spray on the floor?

Back 21

Wet down the floor before it's swept, with water to avoid static electricity from sparking while sweeping the floor which can cause a fire.

Front 22

Why should a fabric covered surface be electrically grounded when dry sanding it?

Back 22

Dry sanding creates enough static electricity on the surface and that can cause a spark and ignite the dope fumes inside the structure.

Front 23

What instructions must be followed when covering and finishing an aircraft with materials specified in a supplemental type certificate (STC)?

Back 23

Instructions that are part of the supplemental type certificate.

Front 24

What finishing material must be used when recovering an aircraft using an STC?

Back 24

Finishing material specified by the STC.

Front 25

How thick should a coat of wash primer be that is used on an aluminum alloy aircraft structure?

Back 25

It should be thin enough that it does not hide the surface of the metal.

Front 26

When mixing epoxy paint, should the converter be added to the resin or the resin to the converter?

Back 26

Convert should always be added to the resin.

Front 27

What are three types of primer that may be used when painting an aircraft?

Back 27

Zinc chromate primer, wash primer, and epoxy primer.

Front 28

What type of thinner is used on zinc chromate primer?

Back 28

Toluol or toluen.

Front 29

What type of primer is used when the maximum protection of the metal is required?

Back 29

Epoxy primer

Front 30

What should be done to corroded aluminum Alloy surface after the corrosion has been removed by mechanical methods?

Back 30

Treat the surface with chemical conversion coating before the top coats are applied.

Front 31

What may be done to a surface to prevent filiform corrosion beneath the topcoat?

Back 31

Make sure the primer is properly and completely cured.

Front 32

How is it finish removed from a fiberglass aircraft component that is being repaired?

Back 32

Sand it off, paint remover can soften the resin of which the component is made.

Front 33

How can a vinyl film decal be removed from an aluminum alloy office?

Back 33

Use a saturated cloth with cyclohexanone or MEK over the decal until it is softened and then scrape off the surface with a plastic scraper.

Front 34

What is the cause of poor adhesion between the topcoat and the fill coats on a fabric surface?

Back 34

Too much aluminum powder in the aluminum pigmented dope.

Front 35

What is the cause of a rough finish on a freshly sprayed surface?

Back 35

Too high atomizing pressure on the spray gun.

Front 36

What causes sags and runs on a surface that has just been sprayed?

Back 36

Too much finishing materials being applied in one coat.

Front 37

What causes orange peel, or spray mottle, in a finish?

Back 37

Incorrect paint viscosity or improper setting of the spray gun.

Front 38

What causes pinholes in a finish?

Back 38

Excessive atomizing air on the spray gun.

Front 39

What causes blushing on the dope finish?

Back 39

Too high humidity.

Front 40

What causes fisheyes in the finish?

Back 40

Localized surface contamination.