Wood Structural Components Repair

What should be checked on metal fittings attached to a wood structure?

Material type, weight, shape
Texture, smoothness, temperature
Corrosion, cracks, bending (correct)
Paint color, cleanliness, size

What should be inspected on exposed end grain wood, especially spar butts?

Cracking or checking (correct)
Paint thickness, coloration
Wood grain pattern, smell
Density, weight

How can compression failures in structural members be detected?

Rupture across the wood fibers (correct)
Increase in weight
Change in temperature
Change in color

What might indicate a compression failure when inspecting a wooden member with a flashlight beam?

Minute ridges or lines running across the grain (A) Signup and view all the answers

Why is particular attention necessary when inspecting wooden members subjected to abnormal bending or compression loads during a hard landing?

To detect potential compression failures (B) Signup and view all the answers

What could result from undetected compression failures in the spar of an aircraft wing?

Structural failure of the wing during flight (D) Signup and view all the answers

What should be inspected for undulation, warping, or any other disparity from the original shape?

Wings, fuselage, and empennage (D) Signup and view all the answers

In light plywood structures, some slight undulation or bulging may be permissible if what conditions are met?

The wood and glue are sound (D) Signup and view all the answers

What should be checked for any deviation from the original shape to ensure safety?

Leading and trailing edges (D) Signup and view all the answers

Why is it important to investigate splits in fabric covering on plywood surfaces?

To ascertain the condition of the plywood skin beneath (D) Signup and view all the answers

What does distortion in light plywood and spruce structures indicate?

Deterioration (B) Signup and view all the answers

If deterioration is found in components like light plywood and spruce structures, what other structure may also be affected?

Main wing structure (C) Signup and view all the answers

What is the purpose of repairing all wood structural components?

To make the structure stronger than the original (A) Signup and view all the answers

What does 'solid wood' refer to in aircraft construction?

Wood consisting of one piece (B) Signup and view all the answers

How is laminated wood defined?

An assembly of glued layers with parallel grain (A) Signup and view all the answers

What is plywood typically made of?

Odd number of thin plies with grains at 90° to each other (A) Signup and view all the answers

How are softwoods and hardwoods classified based on their uses in aircraft construction?

Softwoods are appearance woods, and hardwoods are for structural use (C) Signup and view all the answers

How is structural repair wood graded for possible use?

By strength, load carrying ability, and safety factors (C) Signup and view all the answers

What is the recommended method for testing wood repairs according to the text?

Perform tests using pieces cut from the actual wood under the same mechanical and environmental conditions (D) Signup and view all the answers

What size should the pieces of scrap wood be for the sample test?

1" × 2" × 4" (B) Signup and view all the answers

How should the pieces of scrap wood be joined in the sample test?

By overlapping each approximately 2 inches (C) Signup and view all the answers

What should be the percentage of wood fibers on the fractured glue surface after breaking the joint in the test sample?

At least 75 percent (C) Signup and view all the answers

When repairing ribs in aircraft, what is advisable if new parts are available?

Replace the rib with new parts (B) Signup and view all the answers

What is important when making a repair to a rib according to the text?

Ensure the completed repair is at least equal to the original part in various qualities affecting airworthiness (D) Signup and view all the answers

What is the main advantage of resorcinol glue over other adhesives?

Better wet-weather and ultraviolet resistance (D) Signup and view all the answers

When was resorcinol glue first introduced?

1943 (B) Signup and view all the answers

What should be followed regarding the usage of resorcinol glue?

Manufacturer's product data sheets (A) Signup and view all the answers

Why is it crucial to use resorcinol glue at recommended temperatures?

To ensure full strength of the joint (B) Signup and view all the answers

In what industries did resorcinol glue find immediate widespread application?

Wood boat-building and wood aircraft industry (C) Signup and view all the answers

How does epoxy adhesive differ from resorcinol glue?

Depends less on joint quality and clamping pressure (A) Signup and view all the answers