CRAFTON, PA, USA
N8259
AEROSPATIALE SA 316B
SHORTLY AFTER TAKEOFF THE PILOT HEARD A LOUD GRINDING NOISE AND FELT A VIBRATION EMANATING FROM THE REAR OF THE AIRCRAFT. IMMEDIATELY, THE NOSE YAWED TO THE LEFT AND THE ENGINE FAILED. THE PILOT ENTERED AUTORATION AND MADE A HARD LANDING. EXAMINATION OF THE ENGINE REVEALED THAT THE AFT BEARING SUPPORT HAD TWO BOLTS MISSING AND THE THIRD BOLT WAS SHEARED BUT STILL IN THE MOUNT HOLE. THIS ALLOWED THE AFT TURBINE SECTION TO COME IN CONTACT WITH THE TURBINE HOUSING. EXAMINATION OF THE FIRST STAGE AXIAL COMPRESSOR REVEALED BLADE NUMBER 4 TO HAVE A PIECE MISSING FROM THE ROOT SECTION. FOREIGN OBJECT DAMAGE WAS EVIDENT ON OTHER BLADES EXAMINED.
Source: NTSB Aviation Accident Database
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