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OP Aircraft fabric
| 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 are the fibers that run the length of the fabric , weft is the direction across the fabric at right angles to the warp and bias is a direction 45 degrees angle to the warp and weft. |
| What is the purpose of the selvage 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 applied? | The FAA-PMA stamp is found on the selvage edge and the warp is applied parallel to the line of flight. |
| How are the fabric strength and 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. |
| What types of synthetic fibers are used for covering aircraft? | Fiberglass and 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 rib stitching to prevent the lacing cord from cutting through the fabric. |
| Where would you use surface tape? | Over rib stitching and sewn seams, overlapped edges, around corners and along leading and trailing edges. |
| How should the edges of drainage, inspection, and ventilation holes be reinforced? | With plastic grommets doped directly on the fabric and aluminum or brass gromets mounted on fabric patches. |
| What are the principle methods used to test the condition of fabric? | Punch testers such as the maule or seybolt tester and laboratory lab testing. |
| Fabric is considered un airworhty 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 aluminum foil, cellulose tape or dope proof paint or varnish. |
| What is the principal advantage of the envelope method of covering wings? | Almost all the seams are machined sewed by the envelope provider. |
| What is a tie off knot? | A standard, modified seine knot used on all stitches except the starting stitch. |
| Name three common types of machined sewed seams? | Plain overlap, folded fell, french fell. |
| Where are anti tear strips used? | Over the ribs longerons and stringers in slip stream areas but 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 un known? | Consult the chart in AC 43.13-1B. |
| What is the purpose and location of drain grommets in aircraft skin? | Allow for ventilation and for moisture to drain from the aircraft. On the underside of the airfoil at the trailing edge and as close to ribs as possible and underside of fuselage at low points. |
| Name the methods of applying fabric to an aircraft skin? | Blanket or envelope method. |
| What type of fabric is not effected by moisture or mildew? | Fiberglass fabric. |
| Name two types of organic and synthetic fabric? | Cotton or linen and fiberglass or nylon. |
| How are wrinkles removed from cotton fabric? | By wetting it and allowing it to dry. |
| How wide should surface tape be when covering the trailing edge of a wing? | 3 inches. |
| When is finishing tape applied? | After the second coat of dope is dry and the nap has been sanded away? |
| What is the recommended repair for an L shaped tear when the legs are more than 14 inches long? | A doped on patch as long as the never exceed speed is less than 150 MPH. |
| What paperwork must be completed if an aircraft that was originally covered with Grade-A cotton fabric is re-covered using a synthetic fabric? | The covering must be done according to an STC, and a Form 337 must be executed, stating that all materials and processes complied with the requirements of the STC. |
| What type of rib lacing cord is recommended for attaching cotton fabric to an aircraft structure? | Waxen linen chord. |
| Why is the surface tape used on the trailing edge of the control surfaces of some airplanes notched? | Since the edges of this tape face into the wind, it is possible that it could start to lift and form a very effective spoiler. If the tape is notched, it will tear off at a notch. |
| Should a sewed seam in the fabric used to cover an aircraft wing run spanwise or chordwise? | Both spanwise and chordwise seams are permissible, but chordwise seams are preferred. |
| What is the preferred seam used for machine-sewing pieces of aircraft fabric together? | The French fell seam. |
| What type of material is used for inter-rib bracing in a fabric-covered aircraft wing? | Cotton reinforcing tape. |
| What determines the spacing of the rib lacing stitches on a fabric-covered aircraft wing? | The never exceed speed of the aircraft. |
| What type of hand-sewing stitch is used when sewing in a panel of new fabric on an aircraft fabric-covered wing? | A baseball stitch, locked every eight to ten stitches. |
Created by:
g153511
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