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9/8/98 AC 43.13-1B a. If the fabric type is determined to be polyester, coating identification should start by reviewing the aircraft records and inspect- ing the inside of the wings and the fuselage for the required fabric source identification stamps for covering materials authorized under the STC. The manual, furnished by the holder of the STC-approved fabric, should be reviewed to determine whether the coatings are those specified by the STC. b. Coating types, other than those authorized by the original STC, may have been used with prior FAA approval, and this would be noted in the aircraft records. The presence of dope on polyester can be detected by a sam- ple burn test. 2-33. STRENGTH CRITERIA FOR AIRCRAFT FABRIC. Minimum perform- ance standards for new intermediate-grade fab- ric are specified in TSO-C14b, which refer- ences AMS 3804C. Minimum performance standards for new Grade A fabric are specified in TSO-C15d, which references AMS 3806D. a. The condition of the fabric covering must be determined on every 100-hour and an- nual inspection, because the strength of the fabric is a definite factor in the airworthiness of an airplane. Fabric is considered to be air- worthy until it deteriorates to a breaking strength less than 70 percent of the strength of new fabric required for the aircraft. For exam- ple, if grade-A cotton is used on an airplane that requires only intermediate fabric, it can deteriorate to 46 pounds per inch width (70 percent of the strength of intermediate fab- ric) before it must be replaced. b. Fabric installed on aircraft with a wing loading less than 9 lb. per square foot (psf), and a Vne less than 160 mph, will be considered unairworthy when the breaking strength has deteriorated below 46 lb. per inch width, regardless of the fabric grade. Fabric installed on aircraft with a wing loading of 9 lb. per square foot and over, or a Vne of 160 mph and over, will be considered unair- worthy when the breaking strength has deterio- rated below 56 lb. per inch width. c. Fabric installed on a glider or sail- plane with a wing loading of 8 lb. per square foot and less, and a Vne of 135 mph or less, will be considered unairworthy when the fabric breakingstrengthhasdeterioratedbelow35lb. per inch width, regardless of the fabric grade. 2-34. FABRIC TESTING. Mechanical de- vices used to test fabric by pressing against or piercing the finished fabric are not FAA ap- proved and are used at the discretion of the mechanic to base an opinion on the general fabric condition. Punch test accuracy will de- pend on the individual device calibration, total coating thickness, brittleness, and types of coatings and fabric. Mechanical devices are not applicable to glass fiber fabric that will easily shear and indicate a very low reading regardless of the true breaking strength. If the fabric tests in the lower breaking strength range with the mechanical punch tester or if the overall fabric cover conditions are poor, then more accurate field tests may be made. Cut a 1-1/4-inch wide by 4-inch long sample from a top exposed surface, remove all coat- ings and ravel the edges to a 1-inch width. Clamp each end between suitable clamps with one clamp anchored to a support structure while a load is applied (see table 2-1) by add- ing sand in a suitable container suspended a few inches above the floor. If the breaking strength is still in question, a sample should be sent to a qualified testing laboratory and breaking strength tests made in accordance with American Society of Testing Materials (ASTM) publication D5035. Par 2-32 Page 2-35PDF Image | AFS-640
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