FAA WRITTEN QUESTIONS - PAINTING Flashcards
(15 cards)
6-1
Fungicidal dopes are used in aircraft finishing as the:
A- final, full-bodied, brushed-on coat to reduce blushing.
B- first coat to prevent fabric rotting and are applied thin enough to saturate the fabric.
C- first, full-bodied, brushed-on coat to prevent fungus damage.
B
Fungicidal dope normally is used as the first coat for fabrics to prevent rotting. The first coats applied extremely thin so it can thoroughly saturate both sides of the fabric.
JSAT SA, FAH
6-2 AMA040
What is the usual cause of runs and sags in aircraft finishes?
A- Low atmospheric humidity
B- Too much material applied in one coat
C- Material is being applied too fast
B
Sags and runs result from too much paint being applied, causing the film of wet paint to move by gravity, and presenting a sagging appearance.
JSAT 6A, FAH
6-3 AMA040
Which defect in aircraft finishes may be caused by adverse humidity, drafts, or sudden changes in temperature?
A- Orange peel
B-Pinholes
C- Blushing
C
Blushing occurs because of the effects of high humidity and the temperature drop during the evaporation of the solvents in the dope. Anything which affects either the humidity or the speed of solvent evaporation could cause blushing
JSAT 6A
6-4 AMA007
What is used to slow the drying time of some finishes and to prevent blush?
A-Reducer.
B- Retarder.
C- Rejuvenator.
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.
JSAT 6B
6-5 AMA007
Which type of coating typically includes phosphoric acid as one of its components at the time of application?
A- Wash primer.
B- Epoxy primer.
C- Zinc chromate primer.
A
As one component of their system, wash primers use phosphoric acid to create a phosphate film on the surface of the aluminum.
JSAT 6B
6-6 AMA007
Which properly applied finish topcoat is the most durable and chemical resistant?
A- Synthetic enamel.
B- Polyurethane.
C- Aery lie lacquer.
B
Polyurethane provides the most durable and chemically resistant finish. 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.
JSAT 6B
6-7 AMA040
Aluminum-pigment in dope is used primarily to
A-reflect ultraviolet from the fabric.
B- aid in sealing out moisture from the fabric.
C- provide a silver color.
A
Aluminum pigment is mixed with clear dope and applied to fabric surfaces to help combat the deterioration caused by sunlight.
JSAT 5B
6-8 AMA040
A correct use for acetone is to
A- thin zinc chromate primer.
B- thin dope.
C- remove grease from fabric.
C
Acetone is a fast-evaporating dope solvent that is suitable for removing grease from fabric prior to doping.
JSAT 6B, FAH
6-9 AMA040
Which of the following is a hazard associated with sanding on fabric covered surfaces during the finishing process?
A- Overheating of the fabric/finish, especially with the use of power tools.
B- Static electricity buildup.
C- Embedding of particles in the finish.
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.
JSAT 5B
6-10 AMA007
What is likely to occur if unhydrated wash primer is applied to unpainted aluminum and then about 30 to 40 minutes later a finish topcoat, when the humidity is low?
A- A dull finish due to the topcoat “sinking in” to primer that is still too soft.
B- Corrosion.
C- A glossy, blush-free finish.
B
One of the most critical aspects of the application of wash primer is the necessity of having sufficient moisture in the air. This moisture is required to properly convert the acid into a phosphate film.
This process should take about 30-minutes.
JSAT 6B
6-11 AMA007
Before applying a protective coating to any unpainted clean aluminum you should:
A-wipe the surface with avgas or kerosene.
B- avoid touching the surface with bare hands.
C- remove any conversion coating film.
B
Moisture, skin oils and other contaminants may be left on a surface when you touch it.To prevent problems with the finishing system you should avoid touching surfaces after the final cleaning or wipedown with M.E.K.
JSAT 6B
6-12 AMA007
What is likely to occur if hydrated wash primer is applied to unpainted aluminum and then about 30 to 40 minutes later a finish topcoat, when the humidity is low?
A-A glossy, blush-free finish.
B- A dull finish due to the topcoat “sinking in” to primer that is still too soft.
C- Corrosion.
A
This is the proper method of wash primer usage. One of the most critical aspects of the application of wash primer is the necessity of having sufficient moisture in the air. This moisture is required to properly convert the acid into a phosphate film.
This process should take about 30-minutes.
JSAT 6B
6-13 AMA007
Which statement is true regarding paint system compatibility?
A- Acrylic nitrocellulose lacquers may be used over old nitrocellulose finishes.
B- Old type zinc chromate primer may not be used directly for touchup of bare metal surfaces.
C- Old wash primer coats may be overcoated directly with epoxy finishes.
C
Old wash primer coats may be overcoated directly with epoxy finishes. A new second coat of wash primer must be applied if an acrylic finish is to be applied.
JSAT 6B, FAH
6-14 AMA007
If registration numbers are to be applied to an aircraft with a letter height of 12 inches, what is the minimum space required for the registration mark N1683C?
Note: 2/3 x height = character width.
1/6 x height= width for 1.
1/4 x 2/3 height= spacing.
1/6 x height= stroke or line width.
A- 48 inches.
B- 52 inches.
C- 5 7 inches.
B
For 12-inch characters the width will be 2/3 of 12, which equals 8 inches. The 1 will be 2 inches wide, and the spacing will be 1/4 of 8 inches, or 2 inches.
This will give us 8 + 2 + 2 + 2 + 8 + 2 + 8 + 2 + 8 + 2 + 8, or 52 inches.
JSAT 6C
6-15 AMA007
If masking tape is applied to an aircraft such as for trim spraying, and is left on for several days and/ or exposed to heat, it is likely that the tape will
A- cure to the finish and be very difficult to remove.
B- not seal out the finishing material if the delay or heating occurs before spraying.
C- be weakened in its ability to adhere to the surface.
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 naphtha.
JSAT 6C
