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AircraftCoverings

A&P - Airframe - Aircraft Coverings

QuestionAnswer
What determines the required quality and strength of fabric that is to be used for covering aircraft? The required strength and quality of aircraft fabric is determined by the pounds per square foot of wing loading (PSF), and the never-exceed airspeed of the aircraft (VNE).
When are anti-tear strips recommended and where are they used? Anti-tear strips are installed over the ribs, longerons, and stringers but are under the reinforcing tape before the fabric is installed. They are recommended for all areas in the slipstream.
What is the maximum permissible deterioration of aircraft fabric before it is considered un-airworthy? Fabric covering is considered unairworthy when it deteriorates more than 30 percent from its original required tensile strength.
What should be the strength of the fabric used for re-covering an aircraft? All fabric, surface tape, reinforcing tape, thread and lacing cord used to re-cover or repair an aircraft covering should be of high-grade aircraft textile material. Must be equal to OEM.
What is the purpose and location of drain grommets in aircraft fabric? They allow the condensed moisture to leave the aircraft as well as furnish ventilation. They're located under airfoils at the trailing edge as close to the rib as practical, and at the lowest point along the center of the underside of each fuselage bay.
How are drain grommets installed in aircraft fabric? Brass Grommets are mounted on fabric patches and then doped to the covering. Plastic grommets are doped directly to the covering. Both are installed with a second coat of dope, and the fabric in the center of the grommet is then cut.
Name the methods of applying fabric to an aircraft wing. Blanket and envelope method.
What is the purpose of reinforcing tape? Reinforcing tape is used under all stitching and prevents the stitching cord from tearing through the fabric.
What type of fabric is not affected by moisture or mildew? Fiberglass fabric is not affected by moisture, mildew, chemicals, and most acids.
What methods are used to check the strength of doped fabric? A fabric punch test (Maul Test) will provide a general indication of the strength of the fabric, but if a punch tester indicates that the fabric strength is marginal, a laboratory test should be performed to determine the actual strength of the fabric.
What type of machine-sewed seems are used in aircraft covering? Plain overlap seams, folded-fell seams, and French-fell seams.
What should be done with structure that will come in contact with doped fabric? Treat all parts of the structure that will come in contact with doped fabric with a protective coating such as aluminum foil, dope proof paint, or cellulose tape.
if the original rib stitch spacing cannot be determined when re-covering an aircraft, where can you find the rib stitch spacing that should be used? Use the rib stitch spacing chart in the AC 43.13-1B.
What is the standard tie-off knot used during rib stitching? A modified seine knot is used to tie off all stitches except the starting stitch.
What do you call the edge of cloth, tape, or webbing that has been woven to prevent raveling? or: What is a selvedge edge? Selvage edge. Or: TThe type of fabric used for covering aircraft are organic and synthetic. Name two organic and two synthetic types.
The type of fabric used for covering aircraft are organic and synthetic. Name two organic and two synthetic types. The organic fibers are cotton and linen. The synthetic fibers include fiber glass and heat shrinkable synthetic fibers such as nylon and Dacron.
When covering aircraft, where is surface tape used? Sewed seams, lapped edges, and all stitching is covered with surface tape. The surface tape has a pinked edge to prevent unravelling during the installation process.
Name the advantages of using the envelope method to cover fabric aircraft. it saves labor because practically all sewing is done by machine. It is like pulling a sock over the wing. The only stitching left to do would be to the structure.
How are wrinkles removed from cotton fabric? By wetting the wrinkles and allowing it to dry.
When is finishing tape applied? After the second coat of dope is dry, and the nap has been sanded away.
How wide should surface tape be when used to cover the trailing edge of an aircraft wing? Three inches.
What is the recommended type of repair for an L-shaped tear when the legs are more than 14 inches long? A doped-on patch, if the never-exceed velocity is less than 150 mph.
Created by: MyInnerPeace
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