Witnesses Described That The Airplane “Corkscrewed” Or “Spiraled” As It Descended Nose-Down Toward The Ground Analysis: The flight instructor, commercial-certificated/multi-engine-rated pilot receiving instruction, and a passenger departed on a local flight to practice maneuvers so the pilot could obtain currency in a multi-engine airplane. The pilot receiving instruction had not flown a twin-engine airplane in almost 11 years. This was his first time flying this make/model airplane, and with this flight instructor. Shortly after departure, the airplane climbed to about 3,000 to 3,300 ft mean sea level (msl) and made four alternating left and right 360° turns. After the fourth 360° turn, the airplane began to climb, reaching an altitude of about 4,000 ft msl. The airplane then entered a rapid descent and impacted terrain. Witnesses described that the airplane “corkscrewed” or “spiraled” as it descended nose-down toward the ground. Other witnesses said the airplane sounded as if it were having engine trouble.
