What was found
ENGINE REPAIRED AND RETURNED TO SERVICE APPROX 2/3 WEEKS PRIOR TO BEING SENT TO REPAIR STATION FOR TURBINE FAILURE. DURING INVESTIGATION, DISCOVERED REPAIR STATION HAD NOTICED LOOSE RIVETS ON ENGINES OF THIS TYPE APPROX 4,000 CYCLES AFTER COMPLETION OF P&W SB 6245. THEY ELECTED TO REPLACE ALL SUBJECT RIVETS WHEN ENGINES HAD OVER 4,000 CYCLES FOR REPAIRS. REPAIR STATION'S ENGINEERING DEPT STATED THERE IS A POSSIBILITY OF RIVETS FAILING DUE TO HEAT OR A POSSIBLE FAILURE OF LOCKING CAPABILITY OF THE ANCHOR NUT.