What was found
AIRCRAFT GROUNDED FOR HEAVY MAINTENANCE. UPON ACCOMPLISHMENT OF ATI-57-564-00-02. INTERNAL - GENERAL VISUAL-LEFT AND RIGHT WING TRAILING EDGE SUPPORT STRUCTURE AND REAR SPAR WING TRAILING EDGE, THE FOLLOWING FINDINGS WERE NOTED: AFT PYLON AREA WHERE PANEL 447DB ATTACHES - STIFFENER ON FORWARD SIDE OF WEB CRACKED ON INBOARD SIDE AT ATTACH FASTENERS. EXACT LOC ON AC: NAC WL 150 TO NAC CWL 130PANEL OB #2 PYLON REMOVED, REPAIR WASHER FABRICATED IAW BOEING DWG 313T2380 REV A, PART HEAT TREATED TO T42 IAW BAC5602 REV AG, PART ALODINED IAWB767 AMM 51-21-04 PRIMED IAW B767 AMM 51-24-21, INSTALLED STIFFENER AND OB PYLON. PANEL IAW B767 SRM 51-40-02 PAR 7, PRIMED FASTENERS IAW B767 AMM 51-24-21 TOP COAT APPLIED IAW AMM 51-24-22