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Aviation Accident

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NTSB Identification: CEN16LA040
14 CFR Part 91: General Aviation
Accident occurred Saturday, November 14, 2015 in Sugarland, TX
Probable Cause Approval Date: 03/23/2017
Aircraft: ROBINSON HELICOPTER R22 BETA, registration: N7058Z
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.

The private pilot stated that, while approaching the landing site at the conclusion of the 50-minute flight, the helicopter’s main rotor experienced an overspeed condition. The pilot reduced the throttle but was unable to reduce the rotor rpm, and he initiated an autorotation to a field. The pilot reported that the helicopter's rotor had oversped about 2 weeks before the accident. A 50-hour inspection after the previous overspeed event did not reveal any anomalies. A postaccident visual examination of the helicopter by inspectors from the Federal Aviation Administration did not reveal any anomalies, and the reason for the overspeed of the main rotor system could not be determined.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
  • The overspeed of the main rotor system for reasons that could not be determined based on the available information.