At 1304 Eastern time, the S-LSA was substantially damaged during collision with trees and terrain following an inadvertent spin and dive recovery. The private pilot sustained minor injuries; the flight instructor was seriously injured. Visual conditions prevailed. During an aircraft familiarization flight and at about 2500 msl, the pilot initiated a power-off stall. At the onset of the stall, he added power and the airplane “yawed left.” He applied right rudder and the airplane “snapped into a tight spin to the left.” The instructor took control and verbalized her spin recovery inputs as she performed them, but the airplane continued to spin and lose altitude. The airplane eventually stopped spinning but during the post-spin dive recovery, it struck trees and terrain, coming to rest inverted.
