Non mettalic structures k1- k6

Laminated wood spars may be substituted for solid rectangular wood spars.

if the same quality wood is used in both.

The strength of a well-designed and properly prepared wood splice joint is provided by the

glue.

The I-beam wooden spar is routed to

reduce weight.

The cantileveler wing uses

no external bracing.

Which statement is true regarding a a cantilever wing

No external bracing is needed.

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

parallel grain construction.

On a semi-monocoque fuselage, the skin is reinforced by longitudinal structural members called

longerons and stringers

Which type of monocoque structure has the skin reinforced by a complete framework of structural members?

Reinforced shell.

Servicing diagrams that show arrangements of equipment and location of quick acces doors on an aircraft can be found in the

aircraft manufactureres maintenance manual

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 seperated and the glue surface shows only the imprint of the wood with no wood fibers clinging to the glue.

When Balsa wood is used to replace a damage honycomb core, the plug should be cut so that

the grain is perpendicular to the skin.

What is the purpose of a gusset or gusset plate usedi in the construction and repair of aircraft structures.

To join and reinforce intersecting structural members.

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

compression failure.

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

Compression.

Which statement about wood decay is correct?

Decay is not acceptable in any form or amount.

Which statement concerning wood decay is correct?

Any form or amount of decay is not permitted.

Which of the following conditions will determine acceptance of wood with mineral streaks?

Careful inspection fails to reveal any decay.

Pin knot clusters are permitted in wood aircraft structure provided

they produce a small effect on grain direction.

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.

In cases of elongated bolt hoes in a wood spar or cracks in the vicinity of boltholes,

a new section of spar sould be spliced in or the spar replaced entirely.

When patching a plywoodskin, abrupt changed in cross-sectional areas which will develop dangerous stresses concentration should be avoided by using

circular or elliptical patches