Jan 27, 2017
Incident
Minor Sioux Falls, SD
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 135
Probable Cause
The gas generator rear bearing oil scavenge line blocked with coke, which resulted in a failed rear bearing due to an excess of oil lubrication. Contributing to the incident was the operator not completely performing the maintenance items and not utilizing an oil for higher temperatures.
NTSB CEN17IA094