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