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20 Cards in this Set
- Front
- Back
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Aircraft covering fabrics are made of materials from what two sources? |
Organic and synthetic |
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How would you determine the strength requirements for fabric used to recover an aircraft? |
The fabric must be at least the quality and strength of the fabric used by the original manufacturer |
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What two types of organic fibers are used for covering aircraft? |
Cotton and linen |
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What is meant by warp, weft, and bias? |
warp is the direction along the length of the fabric, weft is the direction across the fabric at right angles to the warp, and bias is a direction at a 45 degree angle to the warp and weft |
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What is the purpose of the salvage edge on a roll of fabric? |
It prevents the fabric from unravelling |
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What identification marking is found on the salvage edge, and in what direction is the warp applied? |
The FAA PMA stamp is found on the selvage edge in the warp is applied parallel to the line of flight |
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How are the fabric type and strength requirements determined for fabric-covered aircraft? |
the original manufacturer determines the fabric type, and the strength requirements are a function of the never exceed speed and wing loading |
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What types of synthetic fibers are used for covering aircraft? |
Fiberglass and heat shrinkable polyester fibers |
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Which of the several types of fabric is unaffected by moisture and mildew? |
Fiberglass |
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What is the function or purpose of reinforcing tape? |
Reinforcing tape is used between the fabric and the rib stitching to prevent releasing cord from cutting through the fabric |
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Where would you use surface tape? |
Over rib stitching and sewing seams, overlapped edges, around corners, and along leading and trailing edges |
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How should the edges of drainage, inspection, and ventilation holes be reinforced? |
Put plastic, aluminum, or brass grommets |
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What are the principal methods used to test the condition of fabric? |
Punch testers such as the Maule or Seybolt tester, and laboratory pull testing |
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Fabric is considered unairworthy when it has deteriorated to what percentage of its original strength? |
Less than 70% |
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How should a structure that will be covered with doped fabric be prepared following inspection and prior to covering? |
Treated with a protective coating of paint or varnish as appropriate |
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What is the principal advantage of the envelope method for covering wings? |
Almost all the seams are machines sold by the envelope supplier |
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What is a tie off knot? |
A standard, modified siene knot used on all stitches except the starting stitch |
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Name three common types of machine sewed seams |
Plain overlap, folded fell, and French fell |
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Where are anti tear strips used? |
Under wing rib stitching when the never exceed speed is greater than 250 miles per hour |
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How would you determine the correct spacing for rib stitching if the original spacing was unknown? |
Consult the chart in AC43.13 - 1B |
