Jun 25, 2003
Accident
Substantial Big Timber, MT
Injuries2 minor
Phase of Flight-
ConditionsVMC
OperationFAR PUBU
Probable Cause
Fretting on the outside diameter of the compressor coupling adapter which resulted in fatigue and subsequent fracture of the adapter, and ultimately the disconnection of the compressor from the turbine assembly. Contributing factors were low rotor RPM, uneven terrain and collapse of the right skid on landing.
NTSB SEA03TA116