What was found
AIRCRAFT 3714, DURING HCK AT QRO, A CRACK WAS FOUND EMANATING FROM A FASTENER HOLE OF RH WING SURFACE, STA 553, S-9R. AFFECTED ELEMENTS ARE SKIN 112A4102-208 (M/F 2324-T39 MACHINED PLATE PER BMS 7-254) & STRINGER 112A4205-208 (M/F 2224-T3511 EXTRUSION PER BMS 7255). CORRECTIVE ACTION: REMOVED EXISTING PRODUCTION FASTENER OF 0.246 HOLE DIAMETER. OVERSIZED THE HOLE IN SKIN AND STRINGER UNTIL THE CRACK IS REMOVED WITH INCREMENTS OF 0.016 /0.035, DO NOT EXCEED 0.311 / 0.313 HOLE DIAMETER. FABRICATED ONE STRAIGHT REPAIR BUSHING FOR THE STRINGER FROM 7075-T6 AL-BAR, SAME THICKNESS AS REQUIRED TO MATCH THE THICKNESS OF THE PART PER B737-800 SRM 51-20-10. FABRICATED ONE COUNTERSINK REPAIR BUSHING FOR THE SKIN FROM 7075-T6 AL-BAR, SAME THICKNESS AS REQUIRED TO MATCH THE THICKNESS OF THE PART PER B737-800 SRM 51-20-10. (LP 1984281)