according to faa ,info found in EA-AC43.13, aircraft woods should have grain
structure straightness of no more than
1" in 15", there are other woods which could be used but spruce has the most
consistant grain structure, and workability. others include: douglas fur,noble
fur,western hemlock,worthern white pine,white cedar,and yellow poplar.
pick up a copy of EA-AC43.13 it's the standard that A&P mechanics use when not
superceded by any other procedures
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