30 Questions
Which materials did Howard Hughes use to construct the Spruce Goose?
Wood
What was the empty weight of the Spruce Goose?
300,000 pounds
How many engines powered the Spruce Goose?
8
What was the maximum takeoff weight of the Spruce Goose?
400,000 pounds
What were the primary control surfaces of the Spruce Goose made of?
Laminated wood with fabric-covered surfaces
Which type of wood is typically used for construction in aircraft?
Softwood
What is the mil-spec for solid spruce?
Mills 6073
What is the mil-spec for plywood?
Mills 6070B
What is the maximum acceptable diameter for hard knots in wood used for aircraft repair?
3/8 inch
What type of grain is acceptable in wood used for aircraft repair?
Interlocked grain
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
Why was wood the material of choice for aircraft construction into the 1930s?
It was cheaper than other materials
What did the British airplane company de Havilland produce during the late 1940s?
Wood airplanes
What hindered the development of strong lightweight metal aircraft structures in the early part of World War II?
Lack of suitable corrosion resistant materials
Which one of these is a type of wood defect characterized by longitudinal cracks extending across the annual rings?
Checks
Which one of these is a type of wood defect characterized by longitudinal cracks usually between two annual rings?
Shakes
Which one of these is a type of wood defect caused by artificially induced stress?
Splits
Which one of these characteristics is associated with compression wood?
All of the above
What should be done if there is doubt about the material or subject?
Reject the material
Which of the following indicates deterioration in the plywood and spruce structures of a wooden aircraft?
Contours and alignment of leading and trailing edges
What may be affected if there is deterioration in the leading and trailing edges of a wooden aircraft?
The main wing structure
What is a possible cause of wood and glue deterioration inside a wooden aircraft structure?
Moisture
What is a challenging aspect of inspecting glue joints in wooden aircraft structures?
Limited access
How can water penetration be detected in a wooden aircraft structure?
Dark gray streaks
According to the text, what is the purpose of the AC mentioned in the first paragraph?
To outline the acceptable methods and techniques for inspecting and repairing aircraft
According to the text, when can the repairs identified in the AC be used as a basis for FAA approval of major repairs?
When listed in FAA Form 337
According to the text, what is required for a certificated mechanic to perform work for which they are rated?
Previous experience in the operation concerned
According to the text, how should an aircraft constructed or comprised of wood components be inspected?
In a dry and well-ventilated hangar
According to the text, what is the ideal range of moisture in the structure of a wood aircraft?
5-10%
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
