CLIFTON, AZ, USA
N57BL
AGUSTA A109
THE PLT REPORTED THAT HE LANDED FIRMLY ON THE GROUND AT THE MAIN RAMP & WENT INTO THE 2 MIN COOL DOWN MODE FOR ENG SHUTDOWN. HE STATED THAT IMMEDIATELY AFTER THE POWER LEVERS WERE RETARDED TO IDLE, HE FELT A SLIGHT LATERAL MOVEMENT OF THE CONTROLS WHICH WAS FOLLOWED BY AN ACCELERATED LATERAL MOVEMENT OF THE HELICOPTER. HE STATED THAT THE HELICOPTER THEN WENT INTO A VIOLENT LATERAL & FORWARD VIBRATION. HE SHUT OFF THE ENG & APPLIED THE ROTOR BRAKE. HOWEVER, BEFORE THE VIBRATION STOPPED, THE TAILROTOR ASSEMBLY HIT THE GROUND & THE MAIN GEAR COLLAPSED. NO PRE-ACCIDENT PART FAILURE OR MALFUNCTION WAS FOUND THAT WOULD HAVE RESULTED IN THE VIBRATION OR GROUND RESONANCE.
Source: NTSB Aviation Accident Database
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