What was found
NR 4 ALT TANK PLATE 505A REMOVED FOR ACCESS. FOUND CRACK FOUND ON VISUAL INSPECTION R/WING WND OF STRINGER 64 APPROX 1" LONG FRONT TO REAR O/B FASTENER AND BY HIGH FREQ EDDY CURRENT. ACP HIGH FREQ EDDY CURRENT INSP. OF LOWER WING SKIN LT SIDE OF LWR WING. OK TO INSTALL, INSTALLED NR 4 ALT TANK PLATE PER M/M 28-10-0 AND 57-30-0 LEAK CK OK. EDDY CURRENT INSP RT WING LWR SURFACE REF LVL III NDT REPORT W.O. 57-100 REV 3 FOR REPAIR SEE LG PG 063738 1W FOR COMPLETE SIGN-OFF AND WORK ACCOMPLISHED. EDDY CURRENT INSP LT WING LWR SURFACE REF LVL III NDT REPORT WO 091005.