What was found
(CAN) THE ENGINE WAS SHUTDOWN IN FLT AFTER LOSS OF OIL PRESSURE: POST FLT- PT WAS STIFF TO TURN, SO- ENGINE WAS SENT FOR INSP & OVERHAUL. DISASSY REVEALED 2 LP TURBINE BLADES WITH 50 PERCENT OF- AIRFOIL MISSING; OVERTEMP DAMAGE TO ALL 4 STAGES OF TURBINE BLADES; A FAILED NR6 BEARING; A FRACTURED NR6 & NR 7 BEARING VENT TUBE; NR 6 &NR 7 BEARING HOUSING SEPARATED & SPLIT IN-HALF;- PRESSURE RELIEF VALVE STUCK OPEN. IT IS- OPINION OF- SUBMITTER THAT- INIT FAILURE OF 2 (2) LP TURBINE BLADE AIRFOILS WAS- CAUSE OF- DAMAGE & SHUTDOWN. IT APPEARS THAT THIS FAILURE OCCURRED SOMETIME PRIOR TO- IFSD &- RESULTING OUT OF BALANCE & VIBRATION WAS- CAUSE OF SECONDARY DAMAGE & LOSS OF OIL PRESSURE: