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Wood Structures

A fainted line running across the grain of a wood spar generally indicates
Compression failure
Shear failure
Decay
Any wooden member that has been overstressed is subject to which type of failure?
Bond failure
Compression failure
Finish failure
Which statement about wood decay is correct?
Decay that occurs before the wood is seasoned does not affect the strength of the finished piece
A limited amount of certain kinds of decay is acceptable in aircraft woods since decay affects the binding between the fibers and not the fibers themselves
Decay is not acceptable in any form or amount
Which statement concerning wood decay is correct?
Decay that appears to be mineral streaks is acceptable
A limited amount of decay along the beveled edges of unrouted beams is acceptable
Any form or amount of decay is not permitted
In cases of enlongated boltholes in a wood spar or cracks in the vicinity of boltholes,
It is permissible to ream the hole, plug with hardwood, and redrill
The spar may be reinforced by using hardwood reinforcing plates
A new section of spar should be spliced in or the spar replaced entirely
Where is information found concerning acceptable species substitutions for wood materials used in aircraft?
AC 43.13-1B
Aircraft Specifications or Type Certificate Data Sheets
Technical Standard Orders
The strength of a well-designed and properly prepared wood splice joint is provided by the
Bearing surface of the wood fibers
Glue
Reinforcement plates
Laminated wood spars may be substituted for solid rectangular wood spars
Only in certain instances where the primary load is shared by one or more other original structural member
If the same quality wood is used in both
Only upon specific approval by the manufacturer or the FAA
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