Jun 17, 2024
Accident
Substantial Hebron, ND
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 137
Probable Cause
Foreign object debris in the Negative Torque Sensing (NTS) system check valve, which impeded the flow of oil to the NTS system and the propeller governor (PG) reset piston, resulting in a total loss of engine power and an off-airport forced landing. Contributing to the accident was the mechanic’s improper adjustment of the PG.
NTSB CEN24LA239