Incident Overview
A certified flight instructor (CFI) was conducting a training flight with a student, demonstrating a simulated engine failure and autorotation. According to the CFI's account, the maneuver began when he took control of the helicopter at an altitude of approximately 250 feet above ground level (AGL). He then entered an autorotation to illustrate the importance of maintaining sufficient airspeed in the event of an engine failure.
Sequence of Events
During the approach phase of the autorotation, the CFI initiated the power recovery later than intended. This delay allowed the rotor rpm to decay. As a result, the helicopter touched down hard, with the heels of the skids making initial contact. The impact caused the helicopter to rock forward abruptly, followed by a loud noise as the main rotor blades struck and severed the tailboom.
Damage
The tailboom was completely severed by the main rotor blades. The extent of other damage is not specified in the available information.
Conclusion
The event occurred during a training exercise aimed at demonstrating autorotation techniques. No further details are provided regarding injuries, weather conditions, or the specific helicopter model.