Sep 26, 2024
Accident
Substantial Fern Prairie, WA
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
An aeroelastic interaction between the helicopter’s main rotor blades and nodal beam system, which resulted in oscillations that exceeded the design limits of the tailboom. Contributing to the accident was the failure of the main rotor blade manufacturer to adequately publish the appropriate recovery technique for a known flight dynamics issue.
NTSB WPR24LA319