Wood Structures Flashcards
Is any form of decay permitted
Any form of decay is not permitted
A faint line running across the grain of a wood spar generally indicates
compression failure
In cases of elongated bolt holes 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
The cantilever wing uses
no external bracing
The strength of a well-designed and properly prepared wood splice is provided by 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 I-bean wooden spar is routed
to reduce weight
Any wooden member that has been over stressed is subject to which type of failure?
Compression
Compression failure in wood aircraft structures are characterized by buckling of the fibers that appear as streaks in the surfaces
at right angles to the grain
Laminated wood spars may be substituted for solid rectangular
if the same quality wood is used in both
Glue deterioration in wood aircraft structure is indicated
when a joint has separated and the glue surfaces shows only the imprint of the wood fibers clinging to the glue
Where is information found concerning acceptable species substitutions for wood materials used in aircraft repairs?
AC 43.13-1B
When patching a plywood skin, abrupt changes in cross-sectional areas which develop dangerous stress concentration should be avoided by using
circular or elliptical patches
Pin knot clusters are permitted in wood aircraft structures provided
they provide a small effect on grain direction
Which of the following condition will determine acceptance of wood with mineral streaks?
Careful inspection fails to reveal any decay
