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9/27/01 AC 43.13-1B CHG 1 Spring the long stub of the original tube from the normal position, slip the replacement tube over the long stub, and then back over the short stub. Center the replacement tube be tween the stubs of the original tube. Tack weld one end of the replacement tube in sev eral places, then weld completely around the end. In order to prevent distortion, allow the weld to cool completely, then weld the re maining end of the replacement tube to the original tube. 4-98. REPAIRS AT BUILT-IN FUSE LAGE FITTINGS. Make splices in accor dance with the methods described in para graphs 4-86 through 4-92. Repair built-in fu selage fittings in the manner shown in fig ure 4-41. The following paragraphs outline the different methods as shown in figure 4-41. a. Tube of Larger Diameter Than Origi nal. A tube (sleeve) of larger diameter than the original is used in the method shown in figure 4-41 (A). The forward splice is a 30-degree scarf splice. Cut the rear longeron (right) approximately 4 inches from the cen terline of the joint and fit a 1 inch long spacer over the longeron, and edge weld this spacer and longeron. Make a tapered “V” cut ap proximately 2 inches long in the aft end of the outer sleeve, and swage the end of the outer sleeve to fit the longeron and weld. b. Tube of Same Diameter as Original. In the method shown in figure 4-41 (B) the new section is the same size as the longeron forward (left) of the fitting. The rear end (right) of the tube is cut at 30 degrees and forms the outside sleeve of the scarf splice. A sleeve is centered over the forward joint as in dicated. c. Simple Sleeve. In figure 4-41 (C), it is as sumed the longeron is the same size on each side of the fitting. It is repaired by a sleeve of larger diameter than the longeron. d. Large Difference in Longeron Diameter Each Side of Fitting. Figure 4-41 (D) as sumes that there is 1/4-inch difference in the diameter of the longeron on the two sides of the fitting. The section of longeron forward (left) of the fitting is cut at 30 degrees, and a section of tubing of the same size as the tube and of such length as to extend well to the rear (right) of the fitting is slipped through it. One end is cut at 30 degrees to fit the 30-degree scarf at left, and the other end fishmouthed. This makes it possible to insert a tube of proper diameter to form an inside sleeve for the tube on the left of the fitting and an outside sleeve for the tube on the right of the fitting. 4-99. ENGINE-MOUNT REPAIRS. All welding on an engine mount must be of the highest quality, since vibration tends to ac centuate any minor defect. Engine-mount members should preferably be repaired by us ing a larger diameter replacement tube, tele scoped over the stub of the original member, and using fishmouth and rosette welds. How ever, 30-degree scarf welds in place of the fishmouth welds will be considered acceptable for engine-mount repair work. a. Repaired engine mounts must be checked for accurate alignment. When tubes are used to replace bent or damaged ones, the original alignment of the structure must be maintained. When drawings are not available, this can be done by measuring the distance between points of corresponding members that have not been distorted. b. Grind out all cracked welds. c. Use only high-grade metallurgically con trolled (mc) welding rods for engine-mount re pairs. Par 4-97 Page 4-71PDF Image | AFS-640
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