Jul 13, 2015
Accident
Substantial Caldwell, ID
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
Abnormal ground contact during a 180 degree autorotation, resulting in a severed tail rotor driveshaft by a main rotor blade. A factor contributing to the accident was the rotor blowback condition due to the aft tilting of the main rotor disk.
NTSB GAA15CA181