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9/8/98 AC 43.13-1B SECTION 4. REPAIRS TO FABRIC COVERING 2-42. GENERAL. All materials used to make repairs to fabric covering must be of a quality at least equal to the original materials. Workmanship and repair methods must be made in a manner that will return the fabric covering to its original airworthy condition. a. Any combination of seams hand-sewn and overlapped and doped may be used to make repairs and install new fabric sections. (See paragraph 2-7.) b. All pigmented dope coats, including aluminum-pigmented coats, should be re moved to the clear dope preliminary coats be fore installing a new fabric section or finishing tape on the old fabric. The appropriate dope thinner (see paragraph 2-20) may be applied with a brush to soften the old dope. The sof tened coats can then be removed down to the clear dope coats by scraping with a dull-bladed knife while supporting the fabric from the back side. Removing the old dope by sanding is optional. c. Avoid allowing dope to run down the back side of the fabric or drip through the wing onto the back side of the opposite surface, which will cause cosmetic damage and will show in a high gloss finish. d. Repairing a new fabric section over two adjacent wing ribs is considered a major repair. A log book entry and an FAA Form 337 must be processed accordingly. e. All fabric patch edges not covered with a finishing tape should have a pinked edge or a 1/4-inch raveled edge. f. Where the edge of a new fabric sec- tion will be located within 1 inch of a struc tural member to which the fabric is attached by rib lacing or other methods, the new fabric section should be extended 3 inches past the structural member. NOTE: Before installing new finish- ing tape, duplicate the original rib lacing or other attachments without removing the original rib lacing or at- tachment. Removing the original fin- ishing tape is optional. g. When installing large sections of fab- ric on a wing or other components, all ma chine-sewn and/or overlapped and doped seams should be made in accordance with the guidelines specified in paragraphs 2-7 and 2-8. h. When repairing a covering material other than cotton or linen, which was ap proved with the manufacturer’s type certificate (TC), or approved under the authority of an STC, follow the repair instructions furnished by the aircraft manufacturer or supplier of the STC-approved covering materials. 2-43. REPAIR OF TEARS AND ACCESS OPENINGS. When all the original fabric is intact, an opening may be repaired by sewing the two sides together with a curved needle as illustrated in figures 2-13 and 2-14. The fabric edges should be pulled together uniformly with no wrinkles. Before sewing, remove the old dope coats down to the clear dope coats a dis tance of 2 inches on each side of the opening. The hand-sewn thread quality should be at least equal to that specified in table 2-2 and treated with wax (paraffin-free or beeswax) to prevent fraying, or use the proper thread on the STC application. After sewing, apply a coat of clear dope over the cleaned area and install a 3-inch wide finishing tape, centered over the stitches. Par 2-42 Page 2-37PDF Image | AFS-640
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