What was found
LT WING NR 4 SLAT OB GUIDE CUTOUT ON FIXED LE, CRACKED AT OB AFT CORNER, MARKED. REMOVED FASTENERS FOR ACCESS AT LT WING NR 4 SLAT OB GUIDE CUTOUT IAW B727 SRM 51-30-2. STOP DRILLED CRACK .250 TERMINATED AT END OF CRACK IAW B727 SRM 51-10-1. NDT INSPECTED AREA USING HFEC AS GIVEN IN B727 NDTM PART 6 51-00-00 FIG 23. N0 CRACK INDICATION WAS NOTED. FAB`D REPAIR MAT USED 2024T3 .063 PO# 9003110 DIM 9 1/2"X 8" IAW B727 SRM 57-30-4 FIG 11. TREATED AND PRIMED AREA AND PARTS IAW B727 SRM 51-10-2. INSTALLED DOUBLER AND FILLER REPAIR IAW B727 SRM 57-30-4 FIG 11.