What was found
DURING SCHEDULED MAINTENANCE, NR 4 PYLON, CRACK DAMAGE WAS FOUND AT PRE-COOLER EXHAUST CUTOUT LOWER AFT CORNER AT FS 248. THE NR 3 STIFFENER WAS REINFORCED WITH A NEW LOWER REPAIR ANGLE FROM FS 235-FS 254. THE RIB INSTALLATION AT NACELLE STATION 248 WAS MODIFIED TO ACCOMMODATE THE NEW STEEL REPAIR ANGLE INSTALLATION ON THE NR 3 STIFFENER. NDT INSPECTION WAS ACCOMPLISHED AT EACH REPAIR AREA AND HFEC INSPECTION OF ALL TRIMMED EDGES AND ALL REPAIR FASTENER LOCATIONS TO ENSURE DEFECT FREE CONDITION. (M)