Sep 1, 2017
Accident
Substantial Harpswell, ME
Injuries1 minor
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
A total loss of engine power due to maintenance personnel's failure to apply proper torque to the cylinder flange nuts and through bolts, which resulted in shifting of the Nos. 1, 2, and 3 main bearings, loss of lubrication, and failure of the crankshaft.
NTSB ERA17LA307