Wood Structures Flashcards
The I-beam wooden spar is routed to
Reduce weight
Which statement about wood decay is correct?
Decay is not acceptable in any form or amount.
In cases of elongated boltholes in a wood spar or cracks in the vicinity of boltholes
A new section of spar should be spliced in or the spar replaced entirely.
Pin knot clusters are permitted in wood aircraft structure provided
They produce a small effect on grain direction.
The strength of a well designed and properly prepared wood splice joint is provided by the
Glue
Which statement concerning wood decay is correct?
Any form or amount of decay is not permitted.
When patching a plywood skin, abrupt changes in cross-sectional areas which will develop dangerous stress concentration should be avoided by
Circular or elliptical patches.
Compression failures in wood aircraft structures are characterized by buckling of the fibers that appear as streaks on the surface
At right angles to the grain.
Laminated wood spars may be substituted for solid rectangular wood spars
If the same quality wood is used in booth.
Which of the following conditions will determine acceptance of wood with mineral streaks
Careful inspection fails to reveal any decay.
Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair?
AC 43.13 - 1B
Glue deterioration in wood aircraft structure is indicated
When a joint has separated and the glue surfaces shows only the imprint of the wood with no wood fibers clinging to the glue.
Laminated wood is sometimes used in the construction of highly stressed aircraft components. This wood can be identified by its
Parallel grain construction
The cantilever wing uses
No external bracing
Any wooden member that has been has been overstressed is subject to which type of failure?
Compression
