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9/8/98 AC 43.13.1B TABLE 2-1. Cotton and linen fabrics. Materials Specification Minimum Tensile Strength New (undoped) Minimum Tearing Strength New (undoped) (ASTM D 1424) Minimum Tensile Strength Deteriorated (undoped) Thread Count Per Inch Use and Remarks Airplane cloth mercerized cotton (Grade “A”). TSO-C15d, as amended, references Society Automotive Engineers AMS 3806d, as amended or MIL-C-5646 80 pounds per inch warp and fill. 5 pounds warp and fill. 56 pounds per inch. 80 min., 84 max. warp and fill. For use on all aircraft. Required on aircraft with wing loading of 9 p.s.f. or greater or placard never exceed speed of 160 m.p.h. or greater. Airplane cloth mercerized cotton. TSO-C14b, as amended, references Society Automotive Engineers AMS-3804c, as amended. 65 pounds per inch warp and fill. 4 pounds warp and fill. 46 pounds per inch. 80 min., 94 max. warp and fill. For use on aircraft with wing loading less than 9 p.s.f. and never exceed speed of less than 160 m.p.h. Airplane cloth mercerized cotton. Society Automotive Engineers AMS 3802, as amended. 50 pounds per inch warp and fill. 3 pounds warp and fill. 35 pounds per inch. 110 max. warp and fill. For use on gliders with wing loading of 8 p.s.f. or less, provided the placarded never-exceed speed is 135 m.p.h. or less. Aircraft linen. British 7F1. This material meets the minimum strength Requirements of TSO-C15. a. Battery Box Treatment. An asphaltic, rubber-based acid-proof coating should be ap plied to the structure in the area of a battery box, by brush, for additional protection from battery acid. Control cables routed in the area of the battery box should be coated with paralketone. b. Worn Holes. Oversized screw holes or worn size 4 self-tapping screw holes through ribs and other structures used to attach fabric may be redrilled a minimum 1-1/2 hole di ameter distance from the original hole location with a # 44 (0.086) drill bit. Size 6 screws, drill bit size # 36 (0.1065), may be installed in stripped or worn holes drilled for size 4 screws, usually without redrilling. Worn holes for wire clips and wire barbs should be redrilled a minimum 1-1/2 hole distance from the original locations using a drill jig to ensure correct spacing, with the appropriate size drill bit. Drill bit size # 30 (0.128) may be used to redrill oversize holes for 1/8-inch diameter blind rivets a minimum 1-1/2 hole diameter distance from the original location. Par 2-6 Page 2-3PDF Image | AFS-640
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