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When and how is finishing tape applied on a fabric-covered aircraft?
Doped on after the first or second coat of dope.
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The determining factor(s) 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
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How many fabric thicknesses will be found in a French-fell
Four
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Finishing tape (surface tape) is used for what purpose?
To provide additional wear resistance over the edges of fabric forming structures.
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Moisture, mildew, chemicals, and acids have no effect on
Glass Fabric
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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.
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The strength classification of fabrics used in aircraft covering is based on
Tensile Strength
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Fabric rejuvenator is used to
restore the condition of dope coatings
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(1) Machine-sewn seams in aircraft covering fabrics may be of the folded-fell or French-fell types.
Only No. 1 is true
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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.
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1. Aluminum foil.
4. Cellulose tape.
1 and 4
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Laminated wood spars may be substituted for solid rectangular wood spars
If the same quaility of wood is used in both.
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The strength of a well-designed and properly prepared wood splice joint is provided by the
Glue
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Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair?
AC 43.13 -1B
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In cases of elongated boltholes in a wood spar or cracks in the vicinity of boltholes,
a new section of spar should be spliced in or the spar replaced entirely.
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A faint line running across the grain of a wood spar generally indicates
Compression Failure
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Which statement about wood decay is correct?
Decay is not acceptable in any form or amount.
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Which of the following conditions will determine acceptance of wood with mineral streaks?
Careful inspection failes to reveal any decay.
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The I-beam wooden spar is routed to
reduce weight
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Pin knot clusters are permitted in wood aircraft structure provided
they produce a small effect on grain direction.
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The cantilever wing uses
no external bracing.
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Laminated wood is sometimes used in the construction of highly stressed aircraft components. This wood can be identified by its
parallel grain construction
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When patching a plywood skin, abrupt changes in cross-sectional areas which will develop dangerous stress concentration should be avoided by using
circular or elliptical patches.
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Glue deterioration in wood aircraft structure is indicated
when a joint has seperated and the glue surface shows only the imprint of the wood with no wood fibers clinging to the glue.
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Compression failures in wood aircraft structures are characterized by buckling of the fibers that appear as streaks on the surface
at right angles to the grain.
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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.
52 inches
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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.
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What is used to slow the drying time of some finishes and to prevent blush?
Retarder
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Which type of coating typically includes phosphoric acid as one of its components at the time of application?
Wash Primer
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Which properly applied finish topcoat is the most durable and chemical resistant?
Polyurethane
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Aluminum-pigment in dope is used primarily to
exclude sunlight from the fabric.
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A correct use for acetone is to
remove grease from frabric.
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Which of the following is a hazard associated with sanding on fabric covered surfaces during the finishing process?
Static Electricity Build Up
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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
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Fungicidal dopes are used in aircraft finishing as the
First coat to prevent fabric rotting and applied thin enough to saturate the fabric.
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Before applying a protective coating to any unpainted clean aluminum, you should
Avoid touching the surface with bare hands.
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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.
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What is the usual cause of runs and sags in aircraft finishes?
Too much material applied in one coat.
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Which defect in aircraft finishes may be caused by adverse humidity, drafts, or sudden changes in temperature?
Blushing
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Which statement is true regarding paint system compatibility?
Old wash primer coats may be overcoated directly with epoxy finishes.
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