Données préliminaires issues de la notification des autorités des Etats-Unis :
The CFI reported that the flight departed from Long Beach about 0920. The purpose of the flight was for the pilot-rated student to undergo an annual training/checkride. While at the Fullerton airport, the student configured the helicopter for a simulated hydraulics off maneuver. At the end of the maneuver the airspeed got too low and the helicopter did a 360° turn from which the CFI could not recover. The helicopter hit the ground and the tail boom severed. The wind was calm.