What was found
DURING REVENUE FLIGHT, THE CREW OBSERVED A LOUD NOISE, FOLLOWED BY VIBRATION AND SMOKE FROM THE EXHAUST. ITT INDICATION DROPPED TO ZERO, THE PROPELLER FEATHERED WITHOUT PILOT INPUT AND THE ENGINE SHUTDOWN WITH OIL STREAMING FROM THE FRONT COWL AREA. NO EMERGENCY WAS DECLARED AND AN UNEVENTFUL SINGLE-ENGINE LANDING WAS ACCOMPLISHED. POST-FLIGHT INSP REVEALED FRACTURED PT BLADES.