December 1, 2013, Yellow Pine, Idaho Beech B36TC Turbocharged Bonanza
At 1303 Mountain time, radar and radio communication with the aircraft were lost. The instrument-rated private pilot and his four passengers are missing at this writing; the airplane has not been located. Instrument conditions prevailed and an IFR flight plan was in effect.
While cruising at 13,000 feet, the pilot reported he was picking up significant icing and requested a descent, then a diversion. The controller observed the airplane descend below 11,900 feet, the minimum safe altitude, and alerted the pilot. The pilot informed the controller he was having engine problems and was unable to maintain altitude. Subsequently, radar and radio contact was lost.
