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40 Cards in this Set
- Front
- Back
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Where are the registration marks required to be placed on a fixed–wing aircraft? |
On a vertical tail surface or on the side of the fuselage.
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What is generally required dimensions of the registration numbers on the side of a fixed–wing aircraft?
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12–inches tall and 2/3 as wide as they are high. The letters M and W may be as wide as they are high. The numeral 1 is 1/6 as wide as it is high.
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What is the regulation regarding the color of the registration marks?
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The color must contrast with the background and be legible.
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Why should wooden wing spars be finished with a transparent varnish?
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The transparent finish allows any decay or rot that develops in the wood to be detected.
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Why is retarder used in dope when the dope is being sprayed in humid conditions?
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The retarder slows the drying of the dope and keeps it from blushing.
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When an aircraft is being recovered, when is fungicidal dope applied to the fabric?
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With the first coat of dope that is brushed into the fabric.
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What will happen if dope is sprayed over an enameled surface?
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the thinner in the dope will penetrate the enamel surface and cause it to swell.
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What are the two basic types of dope used on fabric–covered aircraft?
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Nitrate dope and butyrate (cellulose and acetate butyrate, or CAB) dope.
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What kind of dope is used on polyester synthetic fabric that has been heat–shrunk on an aircraft structure?
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Nontautening butyrate dope.
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Why are some portions of the structure of an aircraft dope proofed before they are covered with fabric?
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Dope proofing keeps the fabric from sticking to the structure when the first coat of dope is applied. The fabric normally sags enough to touch the structure before it begins to pull taut.
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What is meant by dope blushing, and what causes it?
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Blushing is a condition in dope finished in which moisture from the atmosphere condenses on the surface and causes some of the cellulose to precipitate from the finish. Blushing leaves a porous, dull, and weak finish.
Blushing may be caused by the temperature being too low, the humidity being too high, or by drafts or sudden changes in the temperature. |
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What can be done to remedy blushing that has formed on a doped surface that has just been sprayed?
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Spray a very light mist coat of a mixture of one part retarder to two parts of thinner over the blushed area. Allow it to dry and spray on another coat. If this does not remove the blush, the blushed dope will have to be sanded off and new dope applied.
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What is a rejuvenator?
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A slow–drying finishing material that has potent solvents and plasticizers that soften a dried surface film and restore resilience to the film.
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Does rejuvenator restore strength to the fabric?
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No, it only restores resilience to the finish.
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Why is the first coat of dope brushed onto the fabric?
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To ensure thorough penetration and encapsulation of all the fibers.
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What is the general reason for runs and sags in a finish that is being sprayed onto a flat surface?
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Too much dope is being applied. The film is too thick.
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What is the most common cause for dope roping?
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The dope was improperly thinned or it was too cold.
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What causes pinholes in a dope finish?
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Excessive atomizing air pressure on the spray gun.
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Why should the first coat of dope be thinned?
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To ensure thorough penetration and encapsulation of all of the fibers.
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Why is aluminum pigmented dope used on a fabric–covered aircraft?
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To protect the clear dope and the fabric from the harmful effects of the sun.
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What safety precaution must be observed when sweeping a paint room that has dried dope or lacquer overspray on the floor?
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The floor must be wet down with water before it is swept. Static electricity from dry sweeping can cause a fire.
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Why should a fabric–covered surface be electrically grounded when dry–sanding it?
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Dry–sanding can create enough static electricity on the surface that it can cause a spark and ignite the dope fumes inside the structure.
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What instructions must be followed when covering and finishing an aircraft with materials specified in a Supplemental Type Certificate (STC)?
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The instructions that are a part of the STC.
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What finishing materials must be used when recovering an aircraft using an STC?
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The finishing materials specified by the STC.
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How thick should a coat of wash primer be that is used on an aluminum alloy structure?
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It should be thin enough that it does not hide the surface of the metal.
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When mixing epoxy paint, should the converter be added to the resin or the resin to the converter?
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The converter should always be added to the resin, never the resin to the converter.
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What are three types of primer that may be used when painting an aircraft?
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Zinc chromate primer, wash primer, and epoxy primer.
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What type of thinner is used with zinc chromate primer?
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Toluol or toluene.
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What type of primer is used when the maximum protection of the metal is required?
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Epoxy primer.
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What should be done to a corroded aluminum alloy surface after the corrosion has been removed by mechanical methods?
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The surface should be treated with a chemical conversion coating before the topcoats are applied.
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What may be done to the surface to prevent filiform corrosion beneath the topcoat?
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Be sure that the primer is properly and completely cured.
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How is the finish removed from a fiberglass aircraft component that is being repaired?
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The finish must be sanded off. Paint remover can soften the resin of which the component is made.
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How can a vinyl film decal be removed from an aluminum alloy surface?
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Place a cloth saturated with cyclohexanone or MEK over the decal until it is softened, and scrape it off of the surface with a plastic scraper.
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What is a cause of poor adhesion between the topcoat and the fill coats on a fabric surface?
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Too much aluminum powder in the aluminum pigmented dope.
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What is a cause of a rough finish on a freshly sprayed surface?
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Too high atomizing air pressure on the spray gun.
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What causes sags and runs on a surface that has just been sprayed?
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Too much finishing material being applied in one coat.
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What causes orange peel, or spray mottle, in a finish?
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Incorrect paint viscosity or improper setting of the spray gun.
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What causes pinholes in a finish?
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Excessive atomizing air on the spray gun.
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What causes blushing in a dope finish?
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Too high humidity.
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What causes fish-eyes in the finish?
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Localized surface contamination.
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