The NTSB concluded that the pilot’s “inadvertent flight” into severe icing and his “inadequate planning” for the forecast weather was the probable cause of the Jan. 11, 2005 accident involving a Mountain Flight Service air ambulance King Air E90. The two pilots and a medic were killed when the turboprop twin crashed into mountainous terrain while on approach to Rawlins Municipal Airport, Wyo. An earlier Mountain Flight Service accident had a similar probable cause. On March 19, 2003, another Mountain Flight Service King Air E90 crashed, this time on approach to McElroy Airfield, Kremmling, Colo. The pilot, a paramedic and a flight nurse were injured. The NTSB determined on Sept. 30, 2003, the probable cause of this accident to be the “pilot’s improper in-flight planning and his failure to maintain safe clearance from the high terrain.” Factors contributing to the accident were the “high terrain and the dark night.” Mountain Flying Service is based in Steamboat Springs, Colo.