C-FUOW, a privately-registered Cessna 340A aircraft, was conducting a flight from Vernon (CYVK), BC to Ponoka Industrial (Labrie Field) (CEH3), AB with 1 pilot and 2 passengers on board. Passing through 16 000 feet after the departure from CYVK, the right engine (Teledyne Continental TSIO-520-NB) experienced an uncommanded shutdown. The pilot feathered the propeller, declared a MAYDAY, and diverted to Kelowna (CYLW), BC where the aircraft landed without further event.
Maintenance personnel performed a ground run of the right engine, however were not able to determine the cause of the shutdown. Further investigation is ongoing.