Questions and Answers
What is the purpose of the high strength wire running diagonally from the leading edge wing root to the wing trailing edge in a truss type wing?
Which of the following is the standard timber used for aircraft grade timber?
What is a critical requirement for determining grain quality in timber?
What should be avoided when attaching fittings to a wooden aircraft structure?
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How is dry rot in timber primarily identified?
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What is a characteristic of ¼ sawn timber that benefits aircraft components?
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What is the maximum allowable slope of the grain in aircraft timber according to grain quality standards?
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Which of the following defects is NOT acceptable in aircraft timber?
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In which environment should aircraft glues and adhesives be stored?
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What is the typical direction of shrinkage considered negligible in aircraft structural timbers?
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Study Notes
Truss Type Wing and Aircraft Timber
- Drag Wire: High strength wire running diagonally from the leading edge wing root to the wing trailing edge in a truss type wing.
- Aircraft Grade Timber: Sitka Spruce is the standard type of timber used in aircraft construction.
Grain Quality and Wood Storage
- Determining Grain Quality: The slope of the grain should not exceed 1:15, with a minimum of six annular rings per inch.
- Wood Storage: Timber should be stored flat, with boards placed between layers to promote air circulation.
Defects and Shrinkage in Aircraft Timber
- Defects Not Permitted: Four unacceptable defects in aircraft timber include dry rot, splits, knots, and shakes.
- Negligible Shrinkage Direction: Shrinkage is considered negligible in the longitudinal direction parallel to the fibers.
Wood Characteristics and Storage for Adhesives
- Advantage of ¼ Sawn Timber: Reduces the amount of shrinkage over the component's lifespan.
- Storage Facility Requirements: Aircraft glues and adhesives must be stored in a flame-proof cupboard.
Fasteners and Dry Rot Identification
- Fitting Attachments: Avoid over-tightening fasteners and neglecting wood treatment when attaching fittings to wooden structures.
- Dry Rot Identification: It is recognized by softness, discolouration, and an odour reminiscent of mushrooms.
Spar Design Preferences
- I-Beam Spar Advantage: An ‘I-beam’ spar is preferred over a solid spar because it is lighter and stronger.
Surface Preparation for Gluing
- Wood Surface Preparation: Must be clean, dry, and free from oil, grease, or wax. The wood should also be allowed to acclimate for at least 24 hours to equalize moisture content.
Truss Type Wing and Aircraft Timber
- Drag Wire: High strength wire running diagonally from the leading edge wing root to the wing trailing edge in a truss type wing.
- Aircraft Grade Timber: Sitka Spruce is the standard type of timber used in aircraft construction.
Grain Quality and Wood Storage
- Determining Grain Quality: The slope of the grain should not exceed 1:15, with a minimum of six annular rings per inch.
- Wood Storage: Timber should be stored flat, with boards placed between layers to promote air circulation.
Defects and Shrinkage in Aircraft Timber
- Defects Not Permitted: Four unacceptable defects in aircraft timber include dry rot, splits, knots, and shakes.
- Negligible Shrinkage Direction: Shrinkage is considered negligible in the longitudinal direction parallel to the fibers.
Wood Characteristics and Storage for Adhesives
- Advantage of ¼ Sawn Timber: Reduces the amount of shrinkage over the component's lifespan.
- Storage Facility Requirements: Aircraft glues and adhesives must be stored in a flame-proof cupboard.
Fasteners and Dry Rot Identification
- Fitting Attachments: Avoid over-tightening fasteners and neglecting wood treatment when attaching fittings to wooden structures.
- Dry Rot Identification: It is recognized by softness, discolouration, and an odour reminiscent of mushrooms.
Spar Design Preferences
- I-Beam Spar Advantage: An ‘I-beam’ spar is preferred over a solid spar because it is lighter and stronger.
Surface Preparation for Gluing
- Wood Surface Preparation: Must be clean, dry, and free from oil, grease, or wax. The wood should also be allowed to acclimate for at least 24 hours to equalize moisture content.
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Description
Test your knowledge on truss type wings, aircraft-grade timber, and grain quality determination methods. This quiz covers essential concepts related to the materials and structures used in aviation. Get ready to demonstrate your understanding of these critical topics!
