NTSB Identification: NYC99LA204.
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Accident occurred Monday, August 16, 1999 in MANSFIELD, MA
Probable Cause Approval Date: 11/22/2000
Aircraft: Robinson R-22, registration: N20879
Injuries: 1 Minor.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

With his instructor outside the helicopter watching, the student pilot attempted to bring the helicopter to a hover. With the left skid in the air and the entire right skid on the ground, the helicopter rolled over. No pre-impact failures or malfunctions were found. Federal Aviation Administration Advisory Circular 90-87 (Helicopter Dynamic Rollover) states the following; 'During normal or slope takeoffs and landings with...one skid/wheel on the ground, the bank angle or side drift can place the helicopter in a situation where it is pivoting (rolling) about a skid/wheel which is still in contact with the ground....if a roll rate is permitted to develop, a critical bank angle...may be reached where roll cannot be corrected, even with full lateral cyclic.' The student pilot had logged a total of 27 hours of flight experience with all 27 hours in helicopters.

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

Was the student pilot's failure to maintain lateral control of the helicopter while bringing it to a hover. A factor in the accident was the student pilot's lack of total experience in helicopters.

Full narrative available

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