REPAIR OF DAMAGE WITH EXTENDED CRACKS.
The following procedure covers repair of extended
cracks (such as a long cut) in panel skin, (damaged
area does not exceed 36 in. (91.44 cm) square).
Dry panel per paragraph 4-31, if required.
Using portable electric router, Appendix B, Item 15, cut aluminum
patch (Item 4,-Appendix E) one inch larger all
around than damaged area.
Wear safety goggles for eye protection from flying
Layout and drill 1/8 in. (3.18 mm) holes as shown.
Stop-drill all cracks with No. 30 (3.27
Center patch over damaged area and mark
Sand all paint from damaged skin within
mm) drill bit.
patch outline on panel skin.
marked area with sandpaper
Center patch over damaged area and drill No. 30 diameter holes in
Use holes in patch as a template.
Index patch and panel skin with a mark to allow patch to be replaced
in same orientation.
Deburr all drill holes.