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AC 43.13-1B 9/8/98 FIGURE 3-10. Typical types of core replacement. fastened. Figure 3-12 shows a cross-section of a typical bonded and mechanically fastened re pair. The damaged area may or may not need to be filled. (1) Bonded overlap repairs work well on most structures. The overlap repair consists of a solid patch material such as metal, pre cured laminates, prepreg or wet layup material co-cured in place. (2) Bolt or blind rivet. Mechanically fastened, bolted, or blind rivet repairs are pri marily used for thick structures. Primary con cerns include bolt/rivet spacing, fastener di ameter, number of fasteners, and sealant type. g. Core potting is the process of filling the core cutout with a curable paste filler mate rial. If the damage is sustained in an area with an already-potted core, the replacement core should also be potted. In other cases, if the honeycomb or foam core is damaged, it may be potted rather than plugged if the damaged area is small (1 inch or less). Remove the face sheet with a power router, using a router tem plate to prevent injury to undamaged face skin. The router may be adjusted to remove one of the face skins only, a face skin and part of the core, a face skin and all of the core, or both the face skins and the core. (See figure 3-13.) FIGURE 3-11. Typical undercut core material cavity. Page 3-10 Par 3-10PDF Image | AFS-640
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