Jul 4, 2002
Accident
Destroyed Shelley, ID
Injuries1 minor
Phase of Flight-
ConditionsVMC
OperationFAR 137
Probable Cause
A loss of engine power due to the manufacturer's improperly machined threads, which prevented the cylinder base/head halves from being properly assembled, leading to fatigue propagation and the ultimate separation of the cylinder. A contributing factor was the rough terrain.
NTSB SEA02LA121