Incident Overview
Approximately 45 minutes into a training flight, a certified flight instructor (CFI) demonstrated a power recovery autorotation maneuver to their student. Following the demonstration, the student was allowed to perform the maneuver themselves. The CFI informed the student that they would be near the flight controls and would provide guidance on the actions to take during the maneuver.
The Maneuver
After the student entered the autorotation, the CFI observed that the engine and rotor RPMs appeared to be normal. As the helicopter descended to an altitude of approximately 10 to 15 feet, the CFI instructed the student to apply engine power. However, the engine did not respond to throttle movement. The CFI then took control of the helicopter, and it appeared that the engine had "failed."
Result
The helicopter subsequently landed "hard" and rotated 180 degrees. The reason for the loss of engine power was not determined.
Investigation Notes
No determination was made regarding the cause of the power loss. The incident occurred during a routine training exercise, and no further information about the aircraft or occupants was provided in the source.