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19 Cards in this Set
- Front
- Back
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Which species of wood is said to be the standard when comparing other woods for use in aircraft structure? |
Sitka Spruce. |
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What is the basic difference between plywood and laminated wood? |
The grain in each layer of laminated wood runs in the same direction. The grain in the layers of plywood runs at 90° or 45° to each other. |
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What kind of glue is recommended for making a repair to a wooden aircraft structure? |
Synthetic resin glue. |
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How is aircraft plywood prepared for making a compound bend? |
The wood is soaked in hot water until it is pliable. |
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How is pressure applied to the glue joint when splicing a wooden aircraft wing spar? |
With cabinet maker's parallel clamps. |
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How much pressure must be applied to a glue joint in a piece of softwood to produce a strong joint? |
125 to 150 pounds per square inch. |
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What is the correct repair to a wooden aircraft wing spar if the wing-attach bolt holes in the spar are elongated? |
Splice in a new section of the spar and drill new holes. |
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What kind of repair is recommended for a hole in the plywood skin of an aircraft wing? |
A scarf patch. |
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What is the recommended taper for a splayed patch in a plywood aircraft skin? |
5 to 1. |
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What is the recommended taper for a scarf patch in a plywood aircraft skin? |
12 to 1. |
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Why should sandpaper never be used when preparing a scarf joint in a wing spar for splicing? |
The dust caused by sanding will plug the pores of wood so the glue cannot get in to form a good bond. |
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What is the largest hole in a plywood wing skin that can be repaired with a fabric patch? |
One inch in diameter. |
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Why are light steel bushings often used in bolt holes in a wooden wing spar? |
The bushing keeps the spar from being crushed when the nut on the attachment bolt is tightened. |
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How long should a glue joint be kept under pressure when splicing a wooden aircraft wing spar? |
For at least 7 hours. |
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Are mineral streaks in a piece of structural aircraft wood reason for rejecting the wood? |
No, if there is no evidence of decay in the wood. |
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Which area of a wooden aircraft wing spar must not contain any splice? |
There must be no splice under wing-attach fittings, landing gear fittings, engine mount fittings, or lift and interplane strut fittings. |
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How is compression wood identified? |
It has a high specific gravity, it appears to have an excessive growth of summer wood, and little contrast between the spring wood and summer wood. |
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What is done to a splice in a wooden aircraft wing spar to strengthen the splice? |
Reinforcing plates are glued to both sides of the splice. |
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Why must abrupt changes in the cross-sectional area of a wooden aircraft structural member be avoided? |
Abrupt changes in the cross-sectional area of a wooden structural member concentrate stresses and can cause failure. |
