NTSB Identification: WPR10CA065
14 CFR Part 91: General Aviation
Accident occurred Wednesday, November 25, 2009 in Long Beach, CA
Probable Cause Approval Date: 03/23/2010
Aircraft: ROBINSON HELICOPTER R22 BETA, registration: N505LA
Injuries: 2 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The flight instructor reported that he had successfully completed the demonstration of several flight maneuvers for the student pilot. He configured the helicopter for a hovering autorotation, closed the throttle, and the helicopter subsequently descended in a left skid low attitude. The left skid of the helicopter struck the ground, and the instructor attempted to apply corrective control inputs. The helicopter then rolled onto its left side, causing substantial damage to the fuselage and the main rotor system. The flight instructor reported that the helicopter and engine had no mechanical failures or malfunctions prior to the accident. He further stated that the accident could have been prevented if he applied right cyclic, and right yaw pedal control during the descent, and cushioned the landing by raising the collective control.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The flight instructor's failure to arrest the helicopter's descent and to maintain lateral control during a hovering autorotation practice.

Full narrative available

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