The pilot had previously undertaken a dual instructional flight during which he received instruction in, and practised, approaches simulating a jammed tail rotor pedal control. The pilot was then authorised for a solo flight which was to include practice of "jammed pedal" approaches. During one such approach, the skids contacted the ground while the helicopter was not in straight, balanced flight. The helicopter rolled onto its side in an uncontrolled dynamic rollover. Following the accident, the flying school amended its operations manual to preclude solo students practising "jammed pedal" approaches and landings.