NTSB Factual Report

On February 14, 2017, about 1145 central standard time, a Beech C90A airplane, N1551C, was substantially damaged during a forced landing following a loss of engine power during cruise flight near Rattan, Oklahoma. The pilot and two medical crew members on board were not injured. The airplane was registered to and operated by EagleMed LLC under the provisions of 14 Code of Federal Regulations Part 135 as air medical flight. Instrument meteorological conditions prevailed for the flight, which was operated on an instrument flight rules flight plan. The flight originated from the McAlester Regional Airport (MLC), McAlester, Oklahoma, at 0806. The intended destination was the Mc Curtain County Regional Airport (4O4), Idabel, Oklahoma.

The pilot reported that about 15 minutes after takeoff, while established in cruise flight at 7,000 feet mean sea level, the airplane experienced two "quick" electrical power fluctuations. The airplane subsequently lost all electrical power. Due to the associated loss of navigation capability while operating in instrument meteorological conditions, the pilot set a general course for better weather conditions as noted in the preflight weather briefing. During the effort to find a suitable hole in the clouds to descend through under visual conditions, the left engine lost power. The pilot ultimately located a field through the cloud cover and executed a single engine precautionary landing. The nose landing gear collapsed and the radome separated during the landing. The airplane sustained substantial damage to the right engine mount and firewall.