Incident Overview
A flight instructor reported that a training flight involving steep approaches to runway 26L resulted in substantial damage to the helicopter. The first three approaches and landings were conducted without incident. During the fourth approach, at an altitude of approximately 10 to 15 feet above ground level (AGL), the student pilot observed that the engine RPM had dropped into the yellow arc, around 2800 RPM.
Student Actions
In response to the RPM drop, the student stated that he "lowered the collective and rolled on the throttle." Subsequently, the helicopter "dropped dramatically." The student then attempted to cushion the landing by adding collective pitch. The helicopter impacted the ground and spun approximately 180 degrees before coming to rest.
Damage Assessment
An examination of the helicopter revealed substantial damage to the tail boom, skids, tail rotor drive shaft, and the airframe. Examination of the helicopter's systems found no anomalies that could have contributed to the event.
Investigation Findings
The investigation did not identify any mechanical or system malfunctions. The event occurred during a training exercise, and the flight instructor was present throughout the maneuvers.