Wooden Aircraft Structures
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Questions and Answers

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?

  • 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?

  • 3,000 horsepower (correct)
  • 4,000 horsepower
  • 1,000 horsepower
  • 2,000 horsepower

    • What type of aircraft construction has become more prevalent over time?

    <p>Metal</p> Signup and view all the answers

    What is the purpose of building most wood aircraft today?

    <p>Recreation</p> Signup and view all the answers

    Which type of wood is typically used for construction and graded based on strength and load carrying ability?

    <p>Softwood</p> Signup and view all the answers

    What is the mil-spec for solid spruce?

    <p>Mills 6073</p> Signup and view all the answers

    What is the mil-spec for plywood?

    <p>Mills P6070B</p> Signup and view all the answers

    What is the maximum acceptable diameter for hard knots in wood used for aircraft repair?

    <p>3/8 inch</p> Signup and view all the answers

    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?

    <p>All of the above</p> Signup and view all the answers

    Which material was among the first used to construct aircraft?

    <p>Wood</p> Signup and view all the answers

    What were most of the airplanes built during World War One constructed of?

    <p>Wood frames with fabric coverings</p> Signup and view all the answers

    Why was wood the material of choice for aircraft construction into the 1930s?

    <p>Lack of suitable corrosion resistant materials for all metal aircraft</p> Signup and view all the answers

    Which company designed and developed the bomber named the Mosquito?

    <p>de Havilland</p> Signup and view all the answers

    What were the main materials used in the construction of the Mosquito airplanes?

    <p>Spruce, birch plywood, and balsa wood</p> Signup and view all the answers

    Which one of these is a type of defect in wood caused by artificially induced stress?

    <p>Compression wood</p> Signup and view all the answers

    What is the main characteristic of compression wood?

    <p>Little contrast in color between spring wood and summer wood</p> Signup and view all the answers

    Which type of defect is characterized by longitudinal cracks usually between two annual rings?

    <p>Shakes</p> Signup and view all the answers

    What are longitudinal cracks extending across the annual rings called?

    <p>Checks</p> Signup and view all the answers

    Which type of defect is difficult to recognize readily and is detrimental to strength?

    <p>Splits</p> Signup and view all the answers

    According to the text, what is the purpose of the AC mentioned in the first paragraph?

    <p>To specify acceptable methods for aircraft inspection and repair</p> Signup and view all the answers

    According to the text, what is one of the criteria necessary for the use of the AC in part?

    <p>The AC must not be contrary to manufacturer's data</p> Signup and view all the answers

    According to the text, what does Title 14 of the Code of Federal Regulations (14 CFR) Part 65 state?

    <p>Certificated mechanics may not perform work for which they are not rated</p> Signup and view all the answers

    According to the text, what is the ideal range of moisture in wood structures of an aircraft?

    <p>8 to 12</p> Signup and view all the answers

    According to the text, what is permissible for light structures using single plywood covering?

    <p>Undulation or bulging between panels</p> Signup and view all the answers

    Which of the following is an indication of deterioration in plywood and spruce structures?

    <p>Contours and alignment of leading and trailing edges</p> Signup and view all the answers

    What may be affected if there is deterioration in leading and trailing edges?

    <p>The main wing structure</p> Signup and view all the answers

    What can cause wood and glue deterioration inside a structure, even without external indications?

    <p>Moisture</p> Signup and view all the answers

    Why is glue joint inspection in wooden aircraft structures challenging?

    <p>Limited access and difficulty in assessing joint integrity</p> Signup and view all the answers

    How can water penetration be detected in wooden aircraft structures?

    <p>Dark gray streaks, discoloration, or corrosion around screws and fittings</p> Signup and view all the answers

    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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    Description

    Test your knowledge on the inspection and repair of wooden aircraft structures with this informative quiz. Learn about key indicators of deterioration, moisture damage, glue joint integrity, wood decay, and more. Assess your understanding of detecting and addressing mechanical defects in structural members and spars.

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