Wood Structures, Aircraft Covering, and Aircraft Finishes Exam Questions and Answers Latest Update already Passed
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Aircraft Cover
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Aircraft Cover
Wood Structures, Aircraft Covering, and Aircraft Finishes Exam Questions and Answers Latest Update already Passed
Which species of wood is considered to be the standard when comparing other woods for use in aircraft structure? - Answers Sitka spruce
Why must abrupt changes in the cross-sectional...
Wood Structures, Aircraft Covering, and Aircraft Finishes Exam Questions and Answers Latest Update
already Passed
Which species of wood is considered to be the standard when comparing other woods for use in aircraft
structure? - Answers Sitka spruce
Why must abrupt changes in the cross-sectional area of a wooden structural member be avoided? -
Answers Abrupt changes in the cross sectional area of a structural member concentrate stresses and can
cause failure.
What is the basic difference between laminated wood and plywood? - Answers In laminated wood all of
the grain runs in the same direction, in plywood the grain in the layers cross the others at a 90 or 45
degree angle
What effect does moisture have on a wood aircraft? - Answers Moisture causes the wood to swell and
crack as it dries out. It allows fungus to develop in the wood and cause it to decay.
Can northern white pine be used as a substitute for spruce? - Answers Yes, but it must be increased in
size to compensate for its lower strength.
Which wood is more inclined to warp, flat grain or vertical grain? - Answers Flat grain
How do you detect decay in a wood structure? - Answers Stick a sharp-pointed knife blade in the suspect
area and pry the wood up. If the wood is good, it will come up as a long splinter; if it is decayed it will
come up as a chunk.
Are mineral streaks in a piece of structural aircraft wood reason for rejecting the wood? - Answers No, if
there is no evidence of decay in the wood.
How is compression wood identified? - Answers It has a high specific gravity, it appears to have an
excessive growth of summer wood, and little contrast between the spring wood and the summer wood.
Is a hard knot, 1/2-inch in diameter allowed if it is in the web of a wing spar? - Answers No, 3/8-inch
diameter is the maximum allowable knot, and it must meet server restrictions.
Are pin knot clusters allowable in aircraft structural wood? - Answers Yes, if they cause only a small
effect on grain direction.
What kind of glue is recommended for making repairs to a wood aircraft structure? - Answers Synthetic
resin or resorcinol glue.
What reference material may be used for acceptable repairs to wood aircraft structures? - Answers AC
43.13-1B
How is a scarf splice on a wing spar reinforced? - Answers Solid spruce or birch plywood reinforcing
plates are glued to each side of the spar, centered at each end of the scarf.
, What is the correct repair to a wooden aircraft wing spar if the wing-attach bolt holes in the spar are
elongated? - Answers Splice in a new section of the spar and drill new holes.
What is the minimum taper to use when repairing a wood wing rib cap strip? - Answers 12 times the
thickness recommended
10 x Min
How is aircraft plywood prepared for making a compound bend? - Answers Soak the wood in hot water
until it is pliable.
What is used to apply pressure to a glued joint when splicing a wood aircraft wing spar? - Answers
Cabinetmaker's parallel clamps
How much pressure must be applied to a glue joint in a piece of softwood to produce a strong joint? -
Answers 125 to 150 pounds per square inch
What kind of repair is recommended for a hole in the plywood skin of an aircraft wing? - Answers A scarf
patch.
What is the recommended taper for a splayed patch in a plywood aircraft skin? - Answers 5:1
What is the recommended taper for a scarf patch in a plywood aircraft skin? - Answers 12:1
Why should sandpaper never be used when preparing a scarf joint in a wing spar for splicing? - Answers
The dust caused by sanding will plug the pores of the wood so the glue cannot get in to form a good
bond.
What is the largest hole in a plywood wing skin that can be repaired with a fabric patch? - Answers 1"
diameter
Why are light steel bushings often used in bolt holes in a wood wing spar? - Answers The bushings keeps
the spar from being crushed when the nut on the attachment bolt is tightened.
How long should a glue joint be kept under pressure when splicing a wood aircraft wing spar? - Answers
For at least 7 hours.
Which area of a wood wing spar must not contain any splice? - Answers There must be no splice under
wing attach fitting, landing gear fittings, engine mount fittings or lift and inter plane strut fittings.
What is done to a splice in a wood aircraft wing spar to strengthen the splice? - Answers Reinforcing
plates are glued to both sides of the splice.
What reference material may be used for acceptable covering methods for fabric-covered A/C - Answers
AC 43.13-1B
What are three types of fabric that can be used to cover an A/C - Answers Cotton fabric
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