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9/27/01 AC 43.13-1B CHG 1 d. Members Dented in a Bay. Repair dented, bent, cracked, or otherwise damaged tubular members by using a split-sleeve rein forcement. Carefully straighten the damaged member, and in the case of cracks, drill No. 40 (0.098) inch stop holes at the ends of the crack. 4-92. REPAIR BY WELDED SLEEVE. This repair is outlined in figure 4-35. Select a length of steel tube sleeve having an inside di ameter approximately equal to the outside di ameter of the damaged tube and of the same material, and at least the same wall thickness. Diagonally cut the sleeve reinforcement at a 30-degree angle on both ends so that the minimum distance of the sleeve from the edge of the crack or dent is not less than 1-1/2 times the diameter of the damaged tube. Cut through the entire length of the reinforcement sleeve, and separate the half-sections of the sleeve. Clamp the two sleeve sections to the proper positions on the affected areas of the original tube. Weld the reinforcement sleeve along the length of the two sides, and weld both ends of the sleeve to the damaged tube. (See fig ure 4-35.) The filling of dents or cracks with welding rod in lieu of reinforcing the member is not acceptable. 4-93. REPAIR BY BOLTED SLEEVE. Do not use bolted-sleeve repairs on welded steel-tube structure unless specifically author ized by the manufacturer or the FAA. The tube area removed by the bolt holes, in this type of repair, may prove critical. 4-94. WELDED-PATCH REPAIR. Dents or holes in tubing may be repaired by using a patch of the same material, one gauge thicker. (See figure 4-36.) a. Dented Tubing. (1) Dents are not deeper than 1/10 of tube diameter, do not involve more than 1/4 of the tube circumference, and are not longer than tube diameter. (2) Dents are free from cracks, abrasions, and sharp corners. (3) The dented tubing can be substantially re formed, without cracking, before application of the patch. b. Punctured Tubing. Holes are not longer than tube diameter and involve not more than 1/4 of tube circumference. 4-95. SPLICING TUBING BY INNER SLEEVE METHOD. If the damage to a structural tube is such that a partial replace ment of the tube is necessary, the inner-sleeve splice is recommended; especially where a smooth tube surface is desired. (See fig ure 4-37.) a. Make a diagonal cut when removing the damaged portion of the tube, and remove the burr from the edges of the cut by filing or similar means. Diagonally cut a replacement steel tube of the same material and diameter, and at least the same wall thickness, to match the length of the removed portion of the dam aged tube. At each end of the replacement tube allow a 1/8-inch gap from the diagonal cuts to the stubs of the original tube. Select a length of steel tubing of the same material, and at least the same wall thickness, and of an out side diameter equal to the inside diameter of the damaged tube. Fit this inner-sleeve tube material snugly within the original tube, with a maximum diameter difference of 1/16 inch. From this inner-sleeve tube material cut two sections of tubing, each of such a length that the ends of the inner sleeve will be a minimum distance of 1-1/2-tube diameters from the nearest end of the diagonal cut. Par 4-91 Page 4-65PDF Image | AFS-640
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