Wood Structures, FAA Airframe Prepware

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

Which statement about wood decay is correct?

Decay is not acceptable in any form or amount

The cantilever wing uses?

No external bracing

Laminated wood is sometimes used in the construction of highly stressed aircraft components. This wood can be identified by its?

Parallel grain construction

Pin knot clusters are permitted in wood aircraft structure provided?

They produce a small effect on grain direction

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

Any wooden member that has been overstressed is subject to which type of failure?

Compression

A faint line running across the grain of a wood spar generally indicates?

Compression Failure

Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair?

AC 43. 13-1B

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

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

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

The I-beam wooden spar is routed to?

reduce weight