Sequence of Events
During a missed approach conducted at night in instrument meteorological conditions (IMC), the pilots reported an engine fire. They feathered the propeller and shut down the affected engine. Subsequently, while on approach to an alternate airport, the airplane touched down short of the runway, traveled onto the runway surface, and then departed the left side of the runway.
Pilot Report
The pilot reported that he could not maintain altitude due to ice accumulations on the airframe combined with the lack of power from the single operating engine.
Examination Findings
Examination of the wreckage revealed rotational damage to both engines and propellers, consistent with both engines operating at the time of impact. Neither propeller was found in the feathered position.
Icing Conditions and Airspeed
Prior to the flight, the pilot had been briefed about known moderate icing conditions and isolated severe icing. The Airplane Flight Manual (AFM) recommended a minimum speed of 140 knots when operating in icing conditions. The manual stated that at speeds less than 140 knots, ice could accumulate on the wings in unprotected areas. The pilot reported that he flew the approach at 114 knots.
Probable Cause
The failure of the pilot to maintain the minimum required airspeed while operating in icing conditions which resulted in ice accumulations and an inadvertent stall while on approach. Factors were the icing conditions and the pilot's lack of experience in the airplane.