TM 10-5411-201-14T.O. 35E4-178-14-38.REPAIR OF DAMAGE WITH EXTENDED CRACKS.NOTEThe following procedure covers repair of extendedcracks (such as a long cut) in panel skin, (damagedarea does not exceed 36 in. (91.44 cm) square).a.Dry panel per paragraph 4-32, if required.b.Using portable electric router, Appendix B, Item 15, cut aluminumpatch (Item 4, Appendix E) one inch larger all around than damaged area.WARNINGWear safety goggles for eye protection from flyingmetal chips.c.Layout and drill 1/8 in. (3.18 mm) holes as shown.d.Stop-drill all cracks with No. 30 (3.27 mm) drill bit.e.Center patch over damaged area and mark patch outline on panel skin.f.Sand all paint from damaged skin within marked area with sandpaper(Item 17, Appendix E).4-170
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