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AC 43.13-1B 9/8/98 TABLE 2-2. Cotton and Linen, Tapes and Threads. Materials Lacing cord, prewaxed braided cotton. Lacing cord, braided cotton. Lacing cord thread, high tenacity cotton. Machine thread cotton Hand-Sewing thread cotton. Finishing (Surface) tape cotton. Specification Federal T-C-57 1F MIL-C-5648A MIL-T-5660B Federal V-T- 276H Federal V-T- 276H Type III B Same as fabric used. Yarn Size Minimum Tensile Strength 40 pounds. 80 pounds. 62 pounds. 5 pounds. 14 pounds. Same as fabric used. Yards Per Pound 310 minimum. 170 minimum. 480 minimum. 5,000 nominal. 1,650 nominal. Use and Remarks Lacing fabric to structures. Unless already waxed, must be lightly waxed before using. Lacing fabric to structures. Unless already waxed, must be lightly waxed before using. Lacing fabric to structures. Unless already waxed, must be lightly waxed before using. Use for all machine sewing. Use for all hand-sewing. Use fully waxed thread. Use over seams, leading edges, trailing edges, outer edges and ribs, pinked, raveled or straight edges. Reinforcing tape, cotton. MIL-T-566 1 E, Type 1 MIL-Y-1140H 150 pounds per 1/2 inch width. Used as reinforcing tape on fabric and under rib lacing cord. Strength of other widths approx. in proportion. Ticket No. 10. 20/4 ply 8/4 ply Aluminum leading edge replacement fairings installed in short sections may telescope during normal spar bending loads or from thermal expansion and contraction. This action may cause a wrinkle to form in the fabric, at the edge of the lap joint. Leading edge fairing sections may be fastened together with rivets or screws to prevent telescoping after installation. Trailing edges should be adequately secured to prevent movement and wrinkles. d. Dope Protection. Solvents found in nitrate and butyrate dope will penetrate, wrin kle, lift, or dissolve most one-part wood var nishes and one-part metal primers. All wood surfaces that come in contact with doped fabric should be treated with a protective coating such as aluminum foil, cellulose tape, or dope- proof paint to protect them against the action of the solvents in the dope. This can also be accomplished by recoating with a suitable, solvent resistant two-part epoxy varnish, which will be impervious to solvent penetration and damage after curing. Clad aluminum and stainless steel parts need not be dope- proofed. (1) A solvent-sensitive primer on fer rous metal and aluminum alloy components which will be in contact with fabric may be protected from solvent damage by overcoating with a two-part epoxy primer. Epoxy primer meeting MIL-P-53022B is acceptable. (2) Small metal or wood surfaces, such as rib caps, to which fabric will not be dope bonded as a part of the particular fabric at tachment procedure may be protected from dope damage by cellophane tape or aluminum foil. e. Chafe Protection. Fabric and finishing tape is often cut through with sandpaper over sharp edges during the coating and finishing procedure and later polishing. All sharp metal edges or protruding screws, nails, rivets, and bolt heads should be covered with an anti- chafe tape to prevent cutting and wearing through the fabric after installation. Use c. Fairing Precautions. Page 2-4 Par 2-6PDF Image | AFS-640
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