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9/8/98 AC 43.13-1B appropriate non-bleeding cotton adhesive coated tape, finishing tape, or strips of fabric, cut from the fabric being used to cover the air craft, doped in place. (1) Small holes cut through the fabric to accommodate flying wires, control cables, and fittings, must be reinforced with finishing tape or fabric patches cut from the same fabric used for the covering. (2) Areas needing additional chafe pro tection such as control cables routed firm against the fabric surface should be protected with patches cut from cotton duck, leather, or plastic. These patches may be sewn, doped, or cemented in place, as appropriate. (3) Any drag and anti-drag wires in the wings should be protected from chafing at cross points. f. Inter-Rib Bracing. Use a woven fabric tape of the same quality and width as that used for the rib lace reinforcing, where so incorpo rated in the wing design by the original aircraft manufacturer. When the original routing for the inter rib bracing is not known, the tape will be routed diagonally, alternating between the top and bottom of each rib cap on each succes sive rib, if a single pair, half way between the front and rear spars. The number of tape pairs will duplicate the original aircraft manufac turer’s installation. Tapes will be routed con tinuously from the wing butt to the wingtip bow, with one turn of tape around each inter mediate rib cap strip. Care should be given to position the tape so as not to interfere with control cables, bellcranks or push-pull rods. g. Preparation of Plywood Surfaces for Covering. Prior to covering plywood sur faces, prepare the surface by sanding, cleaning, and applying sealer and dope. When plywood surfaces are to be covered with light weight glass fiber deck cloth instead of fabric, no sealer or dope should be applied to the ply wood as it would inhibit penetration of epoxy resin. (1) Sand plywood surfaces as needed to remove old loose dope or varnish residue to provide a clean bonding surface. Remove any oil, grease, or other contamination with a suit able solvent such as naphtha. Small, rough ar eas and irregularities in the plywood surface and around any plywood repairs may be filled and smoothed with an appropriate commercial grade wood filler. Filling large warp depres sions on plywood surfaces with a wood filler for cosmetic purposes is not acceptable. (2) After cleaning and sanding all ply wood surfaces, seal the wood grain with a suit able solvent resistant two-part epoxy varnish. After the varnish has thoroughly dried, apply two brush or spray coats of clear dope, allow ing sufficient drying time between coats. 2-7. FABRIC SEAMS. Seams parallel to the line of flight are preferable; however, spanwise seams are acceptable. a. Sewn Seams. (1) Machine-sewn seams should be double stitched using any of the styles illus trated in figure 2-1 A, B, C, or D. A machine- sewn seam used to close an envelope at a wingtip, wing trailing edge, empennage and control surface trailing edge, and a fuselage longeron may be made with a single stitch when the seam will be positioned over a structure. (See figure 2-1 E.) The envelope size should accommodate fittings or other small protrusions with minimum excess for in stallation. Thick or protruding leading edge sewn seams should be avoided on thin airfoils with a sharp leading edge radius because they may act as a stall strip. Par 2-6 Page 2-5PDF Image | AFS-640
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