30 Questions
Which material was among the first used to construct aircraft?
Wood
What were most of the airplanes built during World War One constructed of?
Wood frames with fabric coverings
What was the material of choice for aircraft construction into the 1930s?
Wood
Which airplane company designed and developed the bomber named the Mosquito?
De Havilland
What were the airplanes made of that De Havilland produced during the late 1940s?
Spruce, birch plywood, and balsa wood
Which material did Howard Hughes use to construct the Spruce Goose aircraft?
Wood
What was the empty weight of the Spruce Goose aircraft?
300,000 pounds
How many Pratt and Whitney engines powered the Spruce Goose aircraft?
8 engines
What was the altitude at which the Spruce Goose aircraft flew during its taxi tests?
70 feet
What is the current status of wood aircraft production?
Wood aircraft are no longer produced
Which type of wood is typically used for construction and graded based on strength, load carrying ability, and safety?
Softwood
What are the acceptable defects in wood species used for aircraft repair?
Cross grain, wavy grain, hard knots, pitch pockets
What is the mil spec for solid spruce?
Mills 6073
What is the mil spec for plywood?
Mills P6070B
Where can one purchase wood components for aircraft repair?
Specialty aircraft supply companies
Which one of these is a type of defect that should be rejected in wood?
Compression wood
What are checks?
Longitudinal cracks extending across the annual rings
What are shakes?
Longitudinal cracks usually between two annual rings
What are splits?
Longitudinal cracks caused by artificially induced stress
What is compression wood characterized by?
Excessive growth of summer wood
According to the text, what is the purpose of the AC mentioned?
To outline acceptable methods for aircraft inspection and repair
According to the text, when can the repairs identified in the AC be used for FAA approval of major repairs?
When listed in FAA Form 337
According to 14 CFR Part 65, what is required for a certificated mechanic to perform work for which they are rated?
Previous performance of the work concerned at an earlier date
According to the text, why should an aircraft constructed or comprised of wood components be placed in a dry, well-ventilated hangar for inspection?
To allow thorough drying of interior sections and compartments
According to the text, what is permissible for light structures using single plywood covering?
Undulation or bulging between panels
Which of the following is a potential indication of deterioration in the plywood and spruce structures of a wooden aircraft?
Contours and alignment of leading and trailing edges
What may be required if there is deterioration in the leading and trailing edges of a wooden aircraft?
Detailed internal inspection
What can cause wood and glue deterioration inside a wooden aircraft structure?
Moisture
Why is glue joint inspection challenging in wooden aircraft structures?
Limited access and difficulty in assessing joint integrity
How can water penetration be detected in a wooden aircraft structure?
Dark gray streaks, discoloration, or corrosion around screws and fittings
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.
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.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
