On July 27, 1994, about 1050 eastern daylight time, a Cessna 152, N68165, registered to Phoenix East Aviation Inc., operating as a 14 CFR Part 141 instructional flight, crashed in the vicinity of Bunnell, Florida. The airplane sustained substantial damage. The commercial pilot/certified flight instructor (CFI), and student pilot were not injured. Visual meteorological conditions prevailed and no flight plan was filed. The flight originated from Daytona Beach, Florida, about 1 hour 30 minutes before the accident. The CFI stated he was demonstrating a simulated engine failure with a power recovery to the student pilot. He entered the maneuver at 1,200 feet agl by reducing the throttle to the idle position, and turning the carburetor heat on. While passing through 800 feet agl, he cleared the engine, and continued with the maneuver. At 500 feet agl, he increased throttle and noticed no response. He reduced the throttle to the idle position, increased throttle, and returned the throttle to idle position with negative results. The position of the fuel selector valve was verified, and a forced landing was made to an open field. On landing rollout the airplane nosed over, and came to a complete stop inverted. Examination of the engine assembly and accessories by Phoenix East Aviation, in the presence of the FAA revealed no evidence to indicate a precrash failure or malfunction. The engine was started and developed power. Review of the probability carburetor icing chart revealed that the engine would encounter serious icing at glide power based on the weather conditions at the time of the accident.