Background
The accident flight was the certified flight instructor's (CFI) first flight with the student. Before departure, the CFI briefed the student that he would be pilot-in-command if anything occurred. The CFI also briefed the student on the traffic pattern and air work including slow-flight and steep turns. A preflight inspection was performed, and no discrepancies were noted.
Flight Sequence
The student flew the airplane, and the flight remained in the traffic pattern, with no other aircraft present. The airplane proceeded upwind, turned crosswind to downwind. On the downwind leg, the CFI advised the student that the aircraft was abeam the runway. When abeam the numbers, the student lowered the flaps to the first notch, reduced power, and turned onto the base leg, where flaps were lowered to the second notch. The student turned onto final with a slight right crosswind and flared too high. The CFI grabbed the controls and advised the student he had the controls. The CFI initiated a go-around by applying full power, but the student still had his hands on the controls. The airplane pitched up into a power-on stall, banked left, and impacted the ground. The CFI advised the student two times that he had the controls. The CFI stated that there were no problems with the engine or flight controls.