What was found
LEFT WING LOWER SKIN HAS A POSSIBLE CRACK AT FASTENER HOLE LOCATED O/B SIDE OF PYLON FAIRING & COMMON TO RUBSTRIP AT RIB 7, STR 10. INDICATION WAS SEEN WHILE PERFORMING NDT MANUAL PART 4 57-10-15. POSSIBLE CRACK HAD AN INDICATION OF APPROX. 45% FSH & WAS TO IMMEDIATE RT OF FASTENER HOLE. REMOVED FASTENER FOR HOLE PROBE, REWORKED RIVET HOLE BY REAMING TO 0.406 IAW SRM 51-40-02. COUNTERSINK REQUIRES REWORK. PERFORMED OPEN HOLE NDT INSP OF HOLE IAW NDT MANUAL PART 6 51-00-00 PROC. 16. INSP WAS INCONCLUSIVE DUE TO HOLE HAVING DAMAGE & MISSING MATERIAL INSIDE & COUNTERSINK. VISUALLY INSP OPEN HOLE AFTER REWORK. FOUND DAMAGE STILL REMAINING IN HOLE & COUNTERSINK AREA. REPAIR COMPLETED PER EA 23-157-01039.