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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