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Terms in this set (20)
Aircraft covering fabrics are made of materials from what 2 sources?
organic and synthetic materials
How would you determine the strength requirements for fabric used to re-cover an aircraft?
must be the same quality or strength used by the manufacturer
What 2 types of organic fibers are used for covering aircraft?
cotton and linen
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, and bias is a direction at a 45 degree angle to the warp and weft
What is the purpose of the selvage edge on a roll of fabric?
prevents the fabric from unraveling
What identification marking is found on the selvage edge, and in which direction is the warp applied?
the FAA stamp is on the selvage edge and warp is applied parallel to the line of flight
How are the fabric type and strength requirements determined for fabric covered aircraft?
the manufacturer determines the fabric type, and the strength is determined by the never exceed speed and wing loading
What types of synthetic fibers are used for covering aircraft?
fiberglass and heat-shrinkable polyester fibers
Which of the several types of fabric is unaffected by moisture and mildew?
What is the function or purpose of reinforcing tape?
used between the fabric and rib stitching to prevent the lacing cord from cutting through the fabric
Where would you use surface tape?
over rib stitching and sewed seams, over lapped edges, around corners, and along leading and trailing edges
How should the edges of drainage, inspection, and ventilation holes be reinforced?
with plastic, aluminum, or brass grommets
What are the principle methods used to test the condition of fabric?
punch testers such as the Maule or Seybolt tester, and laboratory pull testing
Fabric is considered unairworthy when it has deteriorated to what percentage of its original strength?
less than 70%
How should a structure that will be covered with doped fabric be prepared following inspection and prior to covering?
treat it with a protective coating of paint or varnish as appropriate
What is the principle advantage of the envelope method for covering wings?
almost all the seams are machine sewed by the envelope supplier
What is a tie off knot?
a standard modified seine knot used on all stitches except the starting stitch
Name 3 common types of machine sewed seams
plain overlap, folded fell, and French fell
Where are anti-tear strips used?
under wing rib stitching when the never-exceed speed is greater than 250 mph
How would you determine the correct spacing for rib stitching if the original spacing was unknown?
consult the chart in AC 43.13-1B
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