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5 fabric covering
| Question | Answer |
|---|---|
| Aircraft covering Fabrics are made of materials from what two sources? | Organic materials and synthetic materials |
| How would you determine the strength requirements for fabric used to re-cover an aircraft? | The fabric must be of at least the quality and strength of the fabric used by the original manufacturer. |
| What two 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 at right angles to the warp, 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? | It prevents the fabric from unraveling. |
| What identification marking is found on the Selvage Edge, and in which direction is the warp replied? | The FAA-PMA Stamp found on the Selvage Edge and the warp is applied parallel to the line of flight. |
| How are the fabric type and strength requirements determind for fabric-recovered aircraft? | The original manufacturer determines fabric type, and the strength requirements are a function of the never-exceed speed and wing loading. |
| What type 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? | Fiberglass. |
| What is the function or purpose of reinforcing tape? | Reinforcing tape is used between the fabric and the rib stitching to prevent 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 a paint or varnish as appropriate. |
| What is the principle advantage of the envelope method for covering wings? | Almost all the scenes 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 three 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 known? | Consult the chart and AC 43.13-1B. |
Created by:
Big.Bear.M
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