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9/8/98 AC 43.13-1B FIGURE 4-10. Olympic-Lok rivet. 4-58. REPAIR METHODS AND PRE CAUTIONS FOR ALUMINUM STRUC TURE. Carefully examine all adjacent rivets outside of the repair area to ascertain that they have not been harmed by operations in adja cent areas. Drill rivet holes round, straight, and free from cracks. Deburr the hole with an oversize drill or deburring tool. The rivet-set used in driving the rivets must be cupped slightly flatter than the rivet head. (See fig ure 4-6.) Rivets are to be driven straight and tight, but not overdriven or driven while too hard, since the finished rivet must be free from cracks. Information on special methods of riv eting, such as flush riveting, usually may be obtained from manufacturer’s service manuals. a. Splicing of Tubes. Round or stream line aluminum alloy tubular members may be repaired by splicing. (See figure 4-12.) Splices in struts that overlap fittings are not acceptable. When solid rivets go completely through hollow tubes, their diameter must be at least one-eighth of the outside diameter of the outer tube. Rivets which are loaded in shear should be hammered only enough to form a small head and no attempt made to form the standard roundhead. The amount of hammering required to form the standard roundhead often causes the rivet to buckle in side the tube. (Correct and incorrect examples of this type of rivet application are incorpo rated in figure 4-12.) Par 4-57 Page 4-25PDF Image | AFS-640
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