30 Questions
What should be checked on metal fittings attached to a wood structure?
Corrosion, cracks, bending
What should be inspected on exposed end grain wood, especially spar butts?
Cracking or checking
How can compression failures in structural members be detected?
Rupture across the wood fibers
What might indicate a compression failure when inspecting a wooden member with a flashlight beam?
Minute ridges or lines running across the grain
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
What could result from undetected compression failures in the spar of an aircraft wing?
Structural failure of the wing during flight
What should be inspected for undulation, warping, or any other disparity from the original shape?
Wings, fuselage, and empennage
In light plywood structures, some slight undulation or bulging may be permissible if what conditions are met?
The wood and glue are sound
What should be checked for any deviation from the original shape to ensure safety?
Leading and trailing edges
Why is it important to investigate splits in fabric covering on plywood surfaces?
To ascertain the condition of the plywood skin beneath
What does distortion in light plywood and spruce structures indicate?
Deterioration
If deterioration is found in components like light plywood and spruce structures, what other structure may also be affected?
Main wing structure
What is the purpose of repairing all wood structural components?
To make the structure stronger than the original
What does 'solid wood' refer to in aircraft construction?
Wood consisting of one piece
How is laminated wood defined?
An assembly of glued layers with parallel grain
What is plywood typically made of?
Odd number of thin plies with grains at 90° to each other
How are softwoods and hardwoods classified based on their uses in aircraft construction?
Softwoods are appearance woods, and hardwoods are for structural use
How is structural repair wood graded for possible use?
By strength, load carrying ability, and safety factors
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
What size should the pieces of scrap wood be for the sample test?
1" × 2" × 4"
How should the pieces of scrap wood be joined in the sample test?
By overlapping each approximately 2 inches
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
When repairing ribs in aircraft, what is advisable if new parts are available?
Replace the rib with new parts
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
What is the main advantage of resorcinol glue over other adhesives?
Better wet-weather and ultraviolet resistance
When was resorcinol glue first introduced?
1943
What should be followed regarding the usage of resorcinol glue?
Manufacturer's product data sheets
Why is it crucial to use resorcinol glue at recommended temperatures?
To ensure full strength of the joint
In what industries did resorcinol glue find immediate widespread application?
Wood boat-building and wood aircraft industry
How does epoxy adhesive differ from resorcinol glue?
Depends less on joint quality and clamping pressure
Learn about repairing wood structural components to obtain a structure as strong as the original. Discover methods like gluing, glue and nails, or glue and screw-reinforced splicing for minor damage repair.
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