AFTON, WY, USA
N10067
AEROSPATIALE SA-315B
EN ROUTE DURING A SEISMIC OPERATION A LOUD SCREECHING, GRINDING SOUND WAS HEARD. THE PILOT REPORTED THE AIRCRAFT SEEMED TO BUCK. A LONG FLAME EMITTING FROM THE AFT END OF THE AIRCRAFT WAS OBSERVED BY WITNESSES. THE ENGINE CEASED AND THE AIRCRAFT CRASHED INTO TREES. ENGINE DISASSEMBLY REVEALED SUBSTANTIAL INTERNAL DAMAGE TO THE AFT AXIAL COMPRESSOR BEARING, AXIAL COMPRESSOR BLADES AND DIFFUSER BLADES. TWO SECTIONS OF THE NO.3 STATOR BLADE WERE EXAMINED AND REVEALED SURFACE MARKINGS INDICATIVE OF FATIGUE.
Source: NTSB Aviation Accident Database
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