NTSB Identification: LAX84LA478.
The docket is stored on NTSB microfiche number 26143.
Accident occurred Wednesday, September 12, 1984 in CLIFTON, AZ
Aircraft: AGUSTA A109, registration: N57BL
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

REASON FOR OCCURRENCE UNDETERMINED

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