BIG PINEY, WY, USA
N9007N
AEROSPATIALE SA315B
THE ACFT WAS ENGAGED IN SEISMIC ACTIVITY SUPPLYING EXPLOSIVES BY LONG LINE. THE ENG FAILED AT ABOUT 400-500 FT AGL. THE LOAD WAS RELEASED & AN OPEN FIELD WAS SELECTED. AT ABOUT 150 FT AGL THE PLT WAS UNABLE TO MAINTAIN ROTOR RPM & THE ACFT IMPACTED THE GROUND IN AN UPRIGHT POSITION. THE ENG TEARDOWN INDICATED A FATIGUE FAILURE OF THE #4 BLADE ON THE AXIAL COMPRESSOR ASSEMBLY. FATIGUE CRACK DEVELOPOMENTOCCURRED ACROSS APPROXIMATELY 2/3 OF THE PLATFORM AREA BEFORE FINAL SEPARATION OCCURRED. THE BLADE SEPARATION CAUSED SEVERE INTERNAL DAMAGE WITHIN THE COMPRESSOR ASSEMBLY INCLUDING EXTREME AXIAL WHEEL DAMAGE, DESTRUCTIONOF THE AXIAL COMPRESSOR DIFFUSER & BEARING FAILURE.
Source: NTSB Aviation Accident Database
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