What was found
LCQ - MAJOR REPAIR - DURING C-17 CHECK A 1 INCH CRACK WAS FOUND AT END FASTENER OF STRINGER 16 LT, BS 504C. MAINTENANCE REMOVED FASTENER AND CUT OUT DAMAGED SECTION OF STRINGER 16 LT, AT BS 504C; PERFORMED A HFEC INSPECTION OF CUTOUT TO VERIFY NO CRACKS EXIST; FABRICATED A REPAIR CHANNEL, 2 EACH HAT SECTIONS, AND A FILLER; INSTALLED REPAIR PARTS IAW B737-300 SRM 53-00-03, FIG 201, PG 203.