16 Questions
The majority of wood aircraft structures are still produced today.
False
Airframes from the 1930’s through the 1950’s have often failed due to poor maintenance.
False
Mechanics should inspect wood structures for deterioration and airworthiness.
True
Wood and plywood used in aircraft repairs must be of commercial quality.
False
Wood species used to repair a part should be different from the original whenever possible.
False
Shrinkage is greatest in a longitudinal direction.
False
Approval from the airframe manufacturer or the FAA is required for the replacement of modified woods with a substitute material.
True
The selection and approval of woodstock for aircraft structural use can be done by anyone.
False
What is the primary concern when repairing aircraft structures with wood?
Matching the original wood species
What is the purpose of inspecting wood aircraft structures?
To assess the airworthiness of the aircraft
What happens when the moisture content of a wooden part is lowered?
The part shrinks
What is the direction of greatest shrinkage in wood?
Tangential direction
What should be consulted for guidance on the quality of wood used in aircraft repairs?
Army Navy Commerce Department Bulletin ANC-19
Who should select and approve woodstock for aircraft structural use?
Personnel familiar with inspection criteria and methods
Why is it important to consider the effect of shrinkage on the completed structure?
To maintain the structural integrity of the aircraft
What is the criterion for substituting wood species in aircraft repairs?
Matching the original wood species whenever possible
Study Notes
History of Wood Aircraft Structures
- Wood aircraft structures have been used since the early days of certificated aircraft, but today, only a limited number are produced, although many older airframes remain in service.
Inspection and Care
- It is the mechanic's responsibility to inspect wooden structures for deterioration and continuing airworthiness, ensuring they have held up well despite the limitations of technology and experience available at the time of construction.
Quality of Wood
- All wood and plywood used in aircraft structure repairs should be of aircraft quality, as per Army Navy Commerce Department Bulletin ANC-19, Wood Aircraft Inspection and Fabrication.
Characteristics and Properties of Aircraft Wood
- Table 1-1 lists permissible variations in characteristics and properties of aircraft wood, but selection and approval require specialized skills and knowledge of inspection criteria and methods.
Substitution of Original Wood
- When repairing a part, the same wood species as the original should be used whenever possible, but some permissible substitutes are listed in Table 1-1; approval from the airframe manufacturer or FAA is required for replacing modified woods or non-wood products with a substitute material.
Effects of Shrinkage
- Wood shrinkage occurs when the moisture content is lowered, causing uneven dimensional changes: greatest in tangential direction, less in radial direction, and negligible in longitudinal direction.
- Shrinkage can have detrimental effects on a wood structure, such as loosening of joints, and should be considered when making repairs.
History of Wood Aircraft Structures
- Wood aircraft structures have been used since the early days of certificated aircraft, but today, only a limited number are produced, although many older airframes remain in service.
Inspection and Care
- It is the mechanic's responsibility to inspect wooden structures for deterioration and continuing airworthiness, ensuring they have held up well despite the limitations of technology and experience available at the time of construction.
Quality of Wood
- All wood and plywood used in aircraft structure repairs should be of aircraft quality, as per Army Navy Commerce Department Bulletin ANC-19, Wood Aircraft Inspection and Fabrication.
Characteristics and Properties of Aircraft Wood
- Table 1-1 lists permissible variations in characteristics and properties of aircraft wood, but selection and approval require specialized skills and knowledge of inspection criteria and methods.
Substitution of Original Wood
- When repairing a part, the same wood species as the original should be used whenever possible, but some permissible substitutes are listed in Table 1-1; approval from the airframe manufacturer or FAA is required for replacing modified woods or non-wood products with a substitute material.
Effects of Shrinkage
- Wood shrinkage occurs when the moisture content is lowered, causing uneven dimensional changes: greatest in tangential direction, less in radial direction, and negligible in longitudinal direction.
- Shrinkage can have detrimental effects on a wood structure, such as loosening of joints, and should be considered when making repairs.
This quiz covers the history and maintenance of wooden aircraft structures, from their early days to their continued use today. Learn about the importance of inspecting and maintaining older airframes for safe operation.
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