What was found
MCN - MAJOR REPAIR - DURING C-04 CHECK 2 AREAS OF CORROSION WERE FOUND ON LOWER SURFACE OF SHEAR WEB FR 69+331MM, FORWARD SIDE OF FR 70, RBL 1275. MAINTENANCE BLENDED OUT CORROSION LOWER SURFACE OF SHEAR WEB FR 69+331MM, FORWARD SIDE OF FR 70, RBL 1275; MATERIAL LOSS WITHIN LIMITS. PERFORMED HFEC TO VERIFY NO CRACKS EXIST. TREATED, PRIMED AND TOP COATED AREA. REPAIR ACCOMPLISHED PER AWA ER 26-5341-03097-TB2.