Sep 30, 1999
Accident
Substantial LONGMONT, CO
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
An inaccurate touchdown during a full autorotation, which resulted in main rotor flex which cut off the tail boom. Factors were the pilot's lack of total experience in helicopters and high density altitude.
NTSB DEN99LA173