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Longeron Repair

Generally, longerons are comparatively heavy members that do approximately the same work as stringers. The repair methods for longerons are somewhat similar; however, because of their weight, heavier rivets must be used in repairing longerons. Sometimes bolts are used in place of rivets; but it takes more time to install bolts, and greater accuracy in fit is required. For example, if bolts are used, the bolt holes must be drilled for a light drive fit. That is, the bolt must fit the hole tightly enough to require light hammering to be seated in the hole. For these reasons, bolts are not as suitable as rivets. If the longeron consists of a formed section and an extruded angle section, regard each section as separate. Make the repair using the same procedures as for stringers; however, keep the rivet spacing (pitch) between four and six rivet diameters.

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