May 12, 2009
Accident
Substantial Iliamna, AK
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR PUBU
Probable Cause
The main rotor transmission mount design, which resulted in an in-flight vibration/oscillation, and damage to the helicopter during an emergency descent and hard landing. Contributing to the accident was the lack of information from the manufacturer regarding this known flight oscillation, and loading the helicopter beyond the forward center of gravity limit by the pilot.
NTSB ANC09GA040