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Are the 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
Is a hard knot, 1/2 inch in diameter allowed if it is the web of a wing spar?
No, 3/8 inch diameter is the maximum allowable knot, and it must meet severe restrictions.
Which wood is more inclined to warp, flat grain or vertical grain?
Flat grain
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