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AC 43.13-1B 9/8/98 NOTE: It is important that any dam- age found to ribs, such as oversize rivet or screw holes, and cracks or breaks in the rib cap, should be tagged immediately for easy location and re- pair later. c. When repairs are made to fabric sur faces attached by special mechanical methods, duplicate the original type of fastener. When self-tapping screws are used for the attachment of fabric to the rib structure, observe the fol lowing procedure: (1) Redrill the holes where necessary due to wear, distortion, etc., and in such cases, use a screw one size larger as a replacement. (2) Extend the length of the screw be yond the rib capstrip at least two threads. (3) Install a thin washer, preferably aluminum, under the heads of screws and dope pinked-edge tape over each screw head. 2-13. FINISHING TAPE. a. Finishing tape (surface tape) is in stalled after the fabric has been pulled taut with the initial dope application. This proce dure is performed to prevent ripples from forming in fabric panels adjacent to newly ap plied tapes. Ripple formation is caused by the inability of the combined tape and fabric to tighten uniformly with adjacent fabric when additional dope is applied. b. In addition to the tape widths re- quired to be installed over fabric seams speci fied in paragraph 2-7, finishing tape should be installed as weather protection over all rib lacing, screws, rivets, wire clips, or other de vices used to secure fabric. This includes wings, control surface ribs, empennage surface ribs, and fuselage stringers, where so installed by the original aircraft manufacturer. Tape width should be sufficient to bond the fabric a minimum of 3/8 inch on each side of all fabric attachments. Two inch width tape is normally used. Tapes over wing rib lacing should ex tend a minimum of 1/2 inch past each end of any reinforcing tapes. Random or widely- spaced attachments may be covered by indi vidual sections of fabric or finishing tape. c. Installation of finishing tapes for ad ditional wear resistance is recommended over the edges of all fabric-forming structures. This includes fuselage stringers, longerons, leading and trailing edges, false or nose ribs, control surfaces, and empennage ribs not already cov ered and protected by a finishing tape that is required to be on a fabric seam or fabric at tached to the structure. Compound surfaces, such as wingtip bow and empennage surfaces, are more conveniently taped using bias cut finishing tape, which easily conforms to the compound contour, rather than notching linear cut tape to fit the surface. Bias cut tape will be reduced to approximately two thirds the origi nal cut width when pulled tight around a wingtip bow and should be considered when selecting the width of tape for the various lo cations. d. Finishing tapes are applied by coating the fabric surface over which the tape will be applied with dope, applying the tape over the wet dope film, then brushing the tape firmly onto the fabric surface. This action will assure a good bond by thoroughly saturating and wet ting the finishing tape. 2-14. INSPECTION RINGS AND DRAIN GROMMETS. a. Inspection Rings. Inspection access is provided adjacent to or over every control bellcrank, drag-wire junction, cable guide, pulley, wing fitting, or any other component throughout the aircraft which will be inspected or serviced annually. They are installed only Page 2-22 Par 2-12PDF Image | AFS-640
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