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Questions and Answers
Which material was used to construct the Spruce Goose aircraft?
Which material was used to construct the Spruce Goose aircraft?
- Steel
- Aluminum
- Fiberglass
- Wood (correct)
What was the maximum takeoff weight of the Spruce Goose aircraft?
What was the maximum takeoff weight of the Spruce Goose aircraft?
- 200,000 pounds
- 300,000 pounds
- 400,000 pounds (correct)
- 500,000 pounds
How many horsepower did each Pratt and Whitney R-4360 engine produce?
How many horsepower did each Pratt and Whitney R-4360 engine produce?
- 3,000 horsepower (correct)
- 4,000 horsepower
- 1,000 horsepower
- 2,000 horsepower
What type of aircraft construction has become more prevalent over time?
What type of aircraft construction has become more prevalent over time?
What is the purpose of building most wood aircraft today?
What is the purpose of building most wood aircraft today?
Which type of wood is typically used for construction and graded based on strength and load carrying ability?
Which type of wood is typically used for construction and graded based on strength and load carrying ability?
What is the mil-spec for solid spruce?
What is the mil-spec for solid spruce?
What is the mil-spec for plywood?
What is the mil-spec for plywood?
What is the maximum acceptable diameter for hard knots in wood used for aircraft repair?
What is the maximum acceptable diameter for hard knots in wood used for aircraft repair?
What type of grain is acceptable in wood used for aircraft repair if the grain does not diverge from the longitudinal axis of the material more than specified?
What type of grain is acceptable in wood used for aircraft repair if the grain does not diverge from the longitudinal axis of the material more than specified?
Which material was among the first used to construct aircraft?
Which material was among the first used to construct aircraft?
What were most of the airplanes built during World War One constructed of?
What were most of the airplanes built during World War One constructed of?
Why was wood the material of choice for aircraft construction into the 1930s?
Why was wood the material of choice for aircraft construction into the 1930s?
Which company designed and developed the bomber named the Mosquito?
Which company designed and developed the bomber named the Mosquito?
What were the main materials used in the construction of the Mosquito airplanes?
What were the main materials used in the construction of the Mosquito airplanes?
Which one of these is a type of defect in wood caused by artificially induced stress?
Which one of these is a type of defect in wood caused by artificially induced stress?
What is the main characteristic of compression wood?
What is the main characteristic of compression wood?
Which type of defect is characterized by longitudinal cracks usually between two annual rings?
Which type of defect is characterized by longitudinal cracks usually between two annual rings?
What are longitudinal cracks extending across the annual rings called?
What are longitudinal cracks extending across the annual rings called?
Which type of defect is difficult to recognize readily and is detrimental to strength?
Which type of defect is difficult to recognize readily and is detrimental to strength?
According to the text, what is the purpose of the AC mentioned in the first paragraph?
According to the text, what is the purpose of the AC mentioned in the first paragraph?
According to the text, what is one of the criteria necessary for the use of the AC in part?
According to the text, what is one of the criteria necessary for the use of the AC in part?
According to the text, what does Title 14 of the Code of Federal Regulations (14 CFR) Part 65 state?
According to the text, what does Title 14 of the Code of Federal Regulations (14 CFR) Part 65 state?
According to the text, what is the ideal range of moisture in wood structures of an aircraft?
According to the text, what is the ideal range of moisture in wood structures of an aircraft?
According to the text, what is permissible for light structures using single plywood covering?
According to the text, what is permissible for light structures using single plywood covering?
Which of the following is an indication of deterioration in plywood and spruce structures?
Which of the following is an indication of deterioration in plywood and spruce structures?
What may be affected if there is deterioration in leading and trailing edges?
What may be affected if there is deterioration in leading and trailing edges?
What can cause wood and glue deterioration inside a structure, even without external indications?
What can cause wood and glue deterioration inside a structure, even without external indications?
Why is glue joint inspection in wooden aircraft structures challenging?
Why is glue joint inspection in wooden aircraft structures challenging?
How can water penetration be detected in wooden aircraft structures?
How can water penetration be detected in wooden aircraft structures?
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Study Notes
Inspection and Repair of Wooden Aircraft Structures
- Contours and alignment of leading and trailing edges need to be checked for shape deviation, as it indicates deterioration in the plywood and spruce structures.
- Deterioration in leading and trailing edges may affect the main wing structure, requiring a detailed internal inspection.
- Splits in fabric covering on plywood surfaces should be investigated to assess the condition of the plywood skin beneath.
- Moisture can cause wood and glue deterioration inside a structure, even without external indications.
- Musty or multi-odor during initial inspection indicates moisture, fungal growth, and possible decay inside the aircraft structure.
- Glue joint inspection in wooden aircraft structures is challenging due to limited access and difficulty in assessing joint integrity.
- Wood shrinkage caused by temperature and humidity changes can lead to glue joint deterioration, especially in cyclic environments.
- Glue joint failure can occur due to aging, moisture, mechanical forces, or incorrect application of pressure during manufacturing.
- Wood decay and dry rot are easily detectable through discoloration, softening, or crushing of the wood.
- Water penetration can be detected through dark gray streaks, discoloration, or corrosion around screws and fittings.
- Fabric covering on plywood surfaces provides an indication of the wood condition underneath and should be inspected for cracks or swelling.
- Mechanical defects, such as compression failures, cracks, or missing/loose attachments, should be checked in structural members and spars.
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