Jul 16, 2009
Accident
Substantial Suring, WI
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 137
Probable Cause
A loss of engine power resulting from the fatigue failure of the crankshaft due to the loss of engine case through-bolt torque. Contributing to the engine failure was the operator's failure to overhaul the engine in accordance with the manufacturer's recommended guidelines.
NTSB CEN09LA447