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28 Cards in this Set

  • Front
  • Back

Which species of wood is considered to be the standard when comparing other woods for use in aircraft structure?

Sitka spruce.

Why must abrupt changes in the cross-sectional area of a wooden structural member be avoided?

Because it concentrates stresses and can cause failure.

What is the basic difference between laminated wood and plywood?

Laminated wood grain runs parallel or in the same direction, while plywood grain is layered across at 90 or 45° angle.

What effect does moisture have in a wood aircraft structure?

Causes the wood to swell and crack as it dries out. It also allows fungi to develop in the wood and cause it to decay.

Can Northern White pine be used as a substitute for spruce?

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?

Flat grain.

How do you detect decay in a wood structure?

Stick a sharp pointed knife into the suspected area and pry into the wood up. If the wood is good, it will come up as a long splinter. If it's decayed it will come up as a chunk.

Are mineral streaks in a piece of structural aircraft wood reason for rejecting the wood?

No, if there's no evidence of decay in the wood.

How is compression wood identified?

It has a high specific gravity, it appears to have an excessive growth of summerwood, and little contrast between springwood and Summerwood.

Is a knot 1/2-inch in diameter allowed if it is in the web of a wing spar?

No, 3/8 inch diameter is the maximum allowable knot, and it must meet severe restrictions.

Are pin knot clusters allowable in aircraft structural wood?

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?

Synthetic resin or resorcinol glue

What reference material may be used for acceptable repairs to Wood aircraft structure?

AC 43.13 - 1B chapter 1

How is the scarf on a wing spar reinforced?

By gluing spruce or birch plywood reinforcement plates on each side of the spar, centered at each end of the scarf.

What is the correct repair to a wooden aircraft wings spar if the wing attached bolt holes in the spar are elongated?

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?

12 times the thickness recommended, 10 times is the minimum.

How is aircraft plywood prepared for making a compound bend?

Soak the wood in hot water until it is pliable.

What is used to apply pressure to a glue joint when splicing a wood aircraft wings spar?

Cabinetmakers' parallel clamps.

How much pressure must be applied to a glue joint in a piece of soft wood to produce a strong joint?

125 to 150 lb per square inch.

What kind of repair is recommended for a hole in the plywood skin of an aircraft wing?

Scarf patch.

What is the recommended taper for a splayed patch in the plywood aircraft skin?

5 to 1

What is the recommended taper for a scarf patch in a plywood aircraft skin?

12 to 1

Why should sandpaper never be used when preparing a scarf joint in a wings spar for splicing?

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?

1-in in diameter.

Why are light steel bushings often used in both holes in a wood Wing spar?

The bushings keep the spar from being crushed when the knot on the attachment bolt is tightened.

How long should a glue joint be kept under pressure when splicing a wood aircraft wing spar?

At least 7 hours.

Which of the wood Wing spar must not contain any splice?

Under attachment fittings, landing gear fittings, engine mount fittings or lift and interplane strut fittings.

What is done to a splice in a wood aircraft Wing spar to strengthen the splice?

Reinforcing plates are glued to both sides of the splice.