What was found
(CAN) DURING A NON-SCHEDULED HOT SECTION INSPECTION, THE BOLTS SECURING THE CONTAINMENT RING TO POWER TURBINE VANE RING AT FLANGE D WERE FOUND LOOSE. THE LOCK WIRE WAS INTACT, BUT THERE WAS EVIDENCE OF FRETTING FOUND UNDERNEATH THE HEADS OF THE BOLTS. THE BOLTS WERE ABLE TO BE TURNED BY PULLING ON THE LOCK WIRE. NO MAINTENANCE HAD BEEN CARRIED OUT ON THE AFFECTED PART SINCE NEW. THE LOCK WIRE WAS FOUND TO BE 0.016, THE MAINTENANCE MANUAL CALLS FOR 0.025.