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Questions and Answers
The majority of wood aircraft structures are still produced today.
The majority of wood aircraft structures are still produced today.
False (B)
Airframes from the 1930’s through the 1950’s have often failed due to poor maintenance.
Airframes from the 1930’s through the 1950’s have often failed due to poor maintenance.
False (B)
Mechanics should inspect wood structures for deterioration and airworthiness.
Mechanics should inspect wood structures for deterioration and airworthiness.
True (A)
Wood and plywood used in aircraft repairs must be of commercial quality.
Wood and plywood used in aircraft repairs must be of commercial quality.
Wood species used to repair a part should be different from the original whenever possible.
Wood species used to repair a part should be different from the original whenever possible.
Shrinkage is greatest in a longitudinal direction.
Shrinkage is greatest in a longitudinal direction.
Approval from the airframe manufacturer or the FAA is required for the replacement of modified woods with a substitute material.
Approval from the airframe manufacturer or the FAA is required for the replacement of modified woods with a substitute material.
The selection and approval of woodstock for aircraft structural use can be done by anyone.
The selection and approval of woodstock for aircraft structural use can be done by anyone.
What is the primary concern when repairing aircraft structures with wood?
What is the primary concern when repairing aircraft structures with wood?
What is the purpose of inspecting wood aircraft structures?
What is the purpose of inspecting wood aircraft structures?
What happens when the moisture content of a wooden part is lowered?
What happens when the moisture content of a wooden part is lowered?
What is the direction of greatest shrinkage in wood?
What is the direction of greatest shrinkage in wood?
What should be consulted for guidance on the quality of wood used in aircraft repairs?
What should be consulted for guidance on the quality of wood used in aircraft repairs?
Who should select and approve woodstock for aircraft structural use?
Who should select and approve woodstock for aircraft structural use?
Why is it important to consider the effect of shrinkage on the completed structure?
Why is it important to consider the effect of shrinkage on the completed structure?
What is the criterion for substituting wood species in aircraft repairs?
What is the criterion for substituting wood species in aircraft repairs?
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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.
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