Woods
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.
The cantilever wing uses
No external bracing
Wood spars must be
Of solid construction
Laminated wood is often used in the construction of highly stressed aircraft components. This wood can be defined by its
Parallel grain construction
Laminated wood is sometimes used in the construction of highly stressed aircraft components. This wood can be identified by its
Parallel grain construction
The strength of a glue joint must be equal to
The strength of the wood
Pin knot clusters are permitted in wood aircraft structure provided
They produce a small effect on grain direction.
What is the purpose of a gusset or gusset plate used in the construction and repair of aircraft structures?
To join and reinforce intersecting structural members.
Casein glue requires the addition of sodium salts and lime
To prevent attack by microorganisms
Glue deterioration in wood aircraft structure is indicated
When a joint has separated and the glue surface shows only the imprint of the wood with no wood fibers clinging to the glue.
A faint line running across the grain of a wood spar generally indicates
Compression Failure
The moisture content of wood at the time of gluing should be in the range of
8 to 12 percent
Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair?
AC 43.13-1B
Where is information found concerning acceptable species substitution for wood materials used in aircraft repair?
AC 43.13-2B
In order to properly inspect a laminated wood spar
All bolts should be loosened
Which statement concerning wood decay is correct?
Any form or amount of decay is not permitted.
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
Compression failures in wood structures are characterized by buckling of the fibers that appear as streaks on the surface
At right angles to the grain.
Any wooden member that has been overstressed is subject to which type of failure?
Compression
Wood spars may
Be repaired twice, assuming there is not a question of integrity
Which of the following conditions will determine acceptance of wood with mineral streaks?
Careful inspection fails to reveal any decay
Which of the following conditions will determine acceptance of wood with mineral streaks?
Careful inspection fails to reveal any decay.
When patching a plywood skin, abrupt changes in cross-sectional areas which will develop dangerous stress concentration should be avoided by using
Circular or elliptical patches
Which statement about wood decay is correct?
Decay is not acceptable in any form or amount.
Which statement about wood decay is correct?
Decay, unlike some other wood defects, is not acceptable in any form or amount.
The strength of a well-designed and properly prepared wood splice joint is provided by the
Glue
Laminated wood spars may be substituted for solid rectangular wood spars
If the same quality wood is used in both
Laminated wood spars may be substituted for solid rectangular wood spars
If the same quality wood is used in both.
The I-beam wooden spar is routed to
Reduce weight.
When balsa wood is used to replace a damaged honeycomb core, the plug should be cut so that
The grain is perpendicular to the skin