What was found
(CAN) DURING 100 HOUR ANNUAL INSPECTION, THE RIGHT INBOARD UPPER NACELLE AREA REVEALED SMOKING RIVETS ATTACHING STIFFENER ANGLE TO ENGINE MOUNT ATTACHMENT ASSY P/N 50-980089. CLOSER INSPECTION REVEALED APPROXIMATELY A 2 INCH CRACKING STIFFENER ANGLE. DURING THE REPAIR PROCESS, THE UPPER STIFFENER ANGLE WAS ALSO FOUND CRACKED. THESE CRACKS WERE NOT VISIBLE UNTIL AN ACCESS HOLE WAS CUT TO REPAIR LOWER STIFFENER ANGLE. PART TC: 35,143.