What was found
DURING UNSCHEDULED MAINTENANCE AT CINCINNATI, OH (CVG), BLENDING WAS DISCOVERED ON STRINGER 16R BETWEEN APPROXIMATELY FS 435 AND FS 448 DURING REPAIR OF THE FUSELAGE SKIN PER EA 21-C9-53-064-A. UPON INVESTIGATION, THE STRINGER IS IN A NO DAMAGE ALLOWED AREA AND THE BLENDS ARE GREATER THAN 20% OF THE THICKNESS. DAMAGE REQUIRES STRINGER SECTION REMOVAL, REPLACEMENT AND SPLICE REPAIR. THE SH670-31103-4 STRINGER IS FABRICATED FROM 7075-T76511 ALUMINUM S6295 EXTRUSION PER QQ-A-250/15 AND IS 0.063 ½ THICK.