On February 8, 1998, about 1523 eastern standard time, a Cessna 152, N89051, registered to Air Orlando Inc., operating as a 14 CFR Part 91 instructional flight, was flipped over while taxiing behind a Piper Cheyenne conducting an engine run-up at the Orlando Executive Airport, Orlando, Florida. Visual meteorological conditions prevailed and no flight plan was filed. The airplane sustained substantial damage. The commercial pilot certified flight instructor (CFI) and student pilot reported no injuries. The flight was originating at the time of the accident. The CFI stated he was cleared by ground control to taxi to the run-up area in the vicinity of runway 25. A Piper Cheyenne was all ready in the run-up area. They taxied to right of the Cheyenne and conducted an engine run-up. Upon completion of the run-up they made a right 270-degree turn without contacting the tower, and taxied behind the Piper Cheyenne, who was conducting an engine run-up. The right wing was blown upwards, the left wing collided with the ground, and the airplane was pushed sideways to the right. The pilot informed the tower that he was caught in the prop wash as the airplane nosed over inverted.