DUSON, LA, USA
N9014T
Continental Copters TOMCAT MK5A
WHILE ENGAGED IN AN AERIAL APPLICATION OPERATION, THE PILOT HEARD BANGING NOISES AND THE ENGINE BEGAN TO OVERSPEED. ALTHOUGH COLLECTIVE CONTROL WAS INEFFECTIVE, THE PILOT WAS ABLE TO MANEUVER THE HELICOPTER TO A HARD LANDING USING THROTTLE AND PARTIAL CYCLIC CONTROL. POST ACCIDENT INVESTIGATION DISCLOSED THE TRANSMISSION MAST BEARING HAD FAILED, CONTAMINATING THE OIL WITH STEEL PARTICLES THAT OBSTRUCTED THE INTERNAL OIL PASSAGES.
FAILURE OF THE TRANSMISSION MAST BEARING, RESULTING IN OIL CONTAMINATION AND SUBSEQUENT BLOCKAGE OF THE INTERNAL OIL PORTS AND PASSAGES. FACTORS WERE: TOTAL LOSS OF COLLECTIVE CONTROL AND PARTIAL LOSS OF CYCLIC CONTROL.
Source: NTSB Aviation Accident Database
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