Fabrics
This substance does not restore the strength of the fabric but does restore the resiliency of the old dope film.
What is a fabric rejuvenator?
Of all the advantages of using composite materials on aircraft, this is considered the greatest.
What is a high strength-to-weight ratio?
Laminated wood is sometimes used in the construction of highly stressed aircraft components. The wood can be identified by this characteristic.
What is its parallel grain construction?
These are the two general classifications of plastics.
What are thermoplastics and thermosetting plastics?
This machine-sewn seam is the most economical and results in 3 layers of fabric thickness.
What is the modified fell?
These are the determining factors for selecting the correct weight of fabric to be used in covering an aircraft.
What is the speed and the maximum wing load of the aircraft?
These are the three common core materials used in composites to provide compressive strength.
What are foam, honeycomb, and wood?
Compression failures in wood aircraft structures are characterized by this visible condition.
What is at right angles to the grain that appears as streaks on the surface?
This material is softer than glass, making it easier to shape but more prone to scratching.
What are plastic materials?
One of the fabric testers used to test the tensile strength of fabric is often mistakenly called the Reyboth fabric tester, but its correct name is this.
What is Seyboth fabric tester?
This is used on a fabric-covered aircraft to slow the evaporation of solvents and prevent blushing.
What is a retarder?
When the matrix resin is mixed in composite construction, this is the best way to ensure it is properly prepared.
What is a test sample?
This would be present in aircraft wood with mineral streaks that would make it unacceptable for use.
What is decay?
This type of plastic material requires heat to harden permanently and cannot be reshaped once set.
What is a thermosetting plastic?
Intermediate Grade cotton, brand new and undoped, has this minimum required tensile strength per inch.
What is 65 pounds per inch?
This reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric.
What is a warp clock?
These are the five commonly discussed reinforcing materials used in composite construction.
What are fiberglass, carbon fiber, Kevlar, boron fiber, and ceramic fiber?
A faint line running across the grain of a wood spar generally indicates this type of structural issue.
What is compression failure?
Plastic sheets should be stored at this angle from vertical when placed in a rack to prevent warping or distortion.
What is 10 degrees?
These are the four machine-sewn seams commonly used on fabric-covered aircraft.
What are the plain overlap seam, French-fell seam, folded-fell seam, and modified plain overlap seam?
This component helps fabric-covered aircraft allow water to drain out of the structure.
What is a grommet?
This material in a composite structure is the bonding agent that surrounds the fibers, providing strength and transferring stresses to them.
What is the matrix?
The strength of a well-designed and properly prepared wood splice joint is provided completely by this.
What is glue?
This is an identifying characteristic of acrylic plastic.
What is zinc chloride that will have no effect?
A blue diamond with the number 3 inside of it identifies this to the mechanic.
What is a severe health hazard?
The direction across the length of the fabric is defined by this term.
What is the warp?
In a composite structure, this component provides the primary strength.
What is reinforcing materials?
The species of aircraft wood that is the standard for all aircraft wood strength properties is this.
What is Sitka spruce?
This type of drill bit should be used to drill holes into acrylics.
What is a specially modified twist drill bit?
A red diamond with the number 2 inside of it identifies this to the mechanic.
What is a moderate flammable risk?
This special fastener is used to attach fabric to a metal rib.
What is a Martin clip?
This classification refers to high tensile strength fiberglass commonly used in aircraft structures.
What is S-glass?
The type of patch used to repair a plywood skin that is the most preferred for all repairs is this.
What is a scarf patch?
A category of plastic material that is capable of softening or flowing when reheated is described as this.
What is a thermoplastic?
Small cuts or tears in aircraft fabric are repaired using this type of stitch.
What is the baseball stitch?
One advantage of butyrate dope over nitrate dope is this safety-related property.
What is more fire resistant?
This is the preferred method for making permanent repairs on composite structures.
What is a laminating on a new repair plies?
The proper moisture content range for aircraft wood is this.
What is 8 to 12 percent?
This type of plastic hardens permanently when cured and cannot be reshaped with heat.
What is a thermoset?
This process relieves internal stresses in transparent plastics and helps prevent cracking after forming or cutting.
What is annealing?
During an annual inspection, this is the minimum required tensile strength for Grade A cotton fabric to be considered airworthy.
What is 56 pounds?
This method detects defects in composite materials by monitoring for stress waves released as damage occurs under load.
What is acoustic emission testing?
This defect is acceptable in aircraft wood structures as long as it does not cause grain deviation of the wood.
What is pin knot clusters?
The coefficient of expansion of most plastic enclosure materials is this compared to that of metal.
What is greater than that of metal?
This synthetic fabric is most commonly used today in fabric-covered aircraft due to its strength and resistance to moisture and UV damage.
What is polyester?
This material is used on aircraft fabric to insulate it from the sun’s heat and protect it from harmful UV rays.
What is aluminum paste?
When conducting a tap test on a composite panel, this sound would indicate delamination.
What is a dull thud?
This type of wing structure is partially supported by both internal bracing and external struts or wires.
What is a semi-cantilever wing?
This is considered good practice when installing acrylic plastic components.
What is providing adequate spacers or other means to prevent excessive tightening of the frame to the plastic when using rivets?
This defect in composite structures occurs when layers separate due to impact, poor bonding, or stress.
What is delamination?