Prepware Aircraft coverings and Finishes

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?

Corrosion

The best method of repair for a fabric-covered surface which has an L-shaped tear, each leg of which is approximately 14 inches long, is to

Sew with a baseball stitch from the center of the tear out toward the extremity of each leg and then dope on a patch

The determining factor for the selection of the correct weight of textile fabric to be used in covering any type of aircraft is the

Speed of the aircraft and the maximum wing loading

Improper spray adjustments will often result in

Spray dust

Which of the following is a hazard associated with sanding on fabric covered surfaces during the finishing process?

Static electricity buildup

Acrylic urethanes are an air-drying paint

True

Fabric rejuvenator is used to

restore the condition of dope coatings

What is used to slow the drying time of some finishes and to prevent blush?

retarder

When dope-proofing the parts of the aircraft structure that come in contact with doped fabric, which of the following provide an acceptable protective coating? 1. Aluminum foil. 2. Resin impregnated cloth tape. 3. Any one-part type metal primer. 4. Cellulose tape.

1 and 4

(1) Machine-sewn seams in aircraft covering fabrics may be of the folded-fell or French-fell types. (2) A plain lapped seam is never permissible. Regarding the above statements,

1 is true

When testing the strength of Grade A cotton fabric covering an aircraft that requires only intermediate grade, the minimum acceptable strength the fabric must have is

70 percent of the original strength for intermediate fabric

What is the definition of a conversion coating

A coating which is applied to bare aluminum and changes to a very thin protective film

In spray guns, "HVLP" means

High volume, low pressure

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 glossy, blush-free finish

Before applying a protective coating to any unpainted clean aluminum, you should

Avoid touching the surface with bare hands

Which defect is aircraft finishes may be caused by adverse humidity, drafts, or sudden changes in temperature?

Blushing

Fungicide and mildewicide additives are important for fabric covered aircraft, such as

Cotton and linen

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

Cure to the finish and be very difficult to remove

When and how is finishing tape applied on a fabric-covered aircraft?

Dope on after the first or second coat of dope

Fungicidal dopes are used in aircraft finishing as the

First coat to prevent fabric rotting and are applied thin enough to saturate the fabric

Moisture, mildew, chemicals, and acids have no effect on

Glass fabric

True statements about MEK,

It is used as a catalyst for polyester resin. It is very flammable and fast drying

Which statement is true regarding paint system compatibility?

Old wash primer coats may be overcoated directly with epoxy finishes

Which properly applied finish topcoat is the most durable and chemical resistant?

Polyurethane

Characteristics of the Poly-fiber system

They are easily removed with MEK

Airless paint sprayers have limited use in aviation because

They do not deliver as smooth a finish as conventional spray gun

Finishing tape (surface tape) is used for what purpose?

To provide additional wear resistance over the edges of fabric forming structures

What is the usual cause of runs and sags in aircraft finishes

Too much material applied in one coat

A correct use for acetone is to

remove grease from fabric

How many fabric thicknesses will be found in a French-fell seam?

four

Aluminum-pigment in dope is used primarily to

reflect ultraviolet from the fabric

The strength classification of fabrics used in aircraft covering is based on

tensile strength

Which type of coating typically includes phosphoric acid as one of its components at the time of application?

wash primer