NTSB Identification: NYC82FGM12
14 CFR Part 91: General Aviation
Accident occurred Sunday, July 04, 1982 in CRAFTON, PA
Probable Cause Approval Date: 07/04/1983
Aircraft: AEROSPATIALE SA 316B, registration: N8259
Injuries: 3 Uninjured.
NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.
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.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:TURBINE ASSEMBLY,SHAFT BEARING..OTHER
The National Transportation Safety Board determines the probable cause(s) of this accident to be:TURBINE ASSEMBLY,TURBINE WHEEL..LOOSE
MAINTENANCE,INSTALLATION..IMPROPER..OTHER MAINTENANCE PERSONNEL
AIRSPEED..NOT MAINTAINED..PILOT IN COMMAND
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