Sep 19, 2015
Accident
Substantial Fort Glenn, AK
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
The separation of the tail rotor gearbox from the tailboom attachment point due to overstress loads imposed by a tail rotor blade imbalance as the result of impact with an undetermined object during low-level flight operations.
NTSB ANC15LA073