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