Friday, February 24, 2017

Robinson R22 BETA, N7058Z: Accident occurred November 14, 2015 in Sugar Land, Fort Bend County, Texas

Aviation Accident Final Report - National Transportation Safety Board: https://app.ntsb.gov/pdf

The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Houston, Texas FSDO-09

Aviation Accident Factual Report -  National Transportation Safety Board:  https://app.ntsb.gov/pdf

Docket And Docket Items -  National Transportation Safety Board: https://dms.ntsb.gov/pubdms

http://registry.faa.gov/N7058Z

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.



On November 14, 2015, about 0950 central standard time, a Robinson R22 Beta helicopter, N7058Z, experienced a hard landing following an autorotation near Sugarland, Texas. The private rated pilot sustained minor injuries and the helicopter was substantially damaged. The helicopter was registered to Jerry Trimble Helicopters and operated by a private individual under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight, which operated without a flight plan.

According to the pilot, after flying for about 50 minutes the main rotor rpm over-sped, and went to the top of the gauge. The pilot reduced throttle but was unable to get the rotor rpms within limits, so he initiated an autorotation. The pilot maneuvered the helicopter to an open field location and landed hard. After the initial impact, the helicopter rolled on to its left side. The tail boom was severed from the fuselage during the impact, and was displaced about 150 feet from the fuselage.

The pilot reported that the helicopter's rotor had over sped about 2 weeks prior to the accident. A 50-hour inspection of the helicopter did not reveal a reason for the main rotor over speed. The pilot suspected a mechanical malfunction resulting in an over speed of the rotor system. A visual examination of the helicopter by inspectors from the Federal Aviation Administration did not reveal any anomalies.



NTSB Identification: CEN16LA040 
14 CFR Part 91: General Aviation
Accident occurred Saturday, November 14, 2015 in Sugarland, TX
Aircraft: ROBINSON HELICOPTER R22 BETA, registration: N7058Z
Injuries: 1 Serious.

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

On November 14, 2015, about 1025 central standard time, a Robinson R22 Beta helicopter, N7058Z, experienced a hard landing during an autorotation near Sugarland, Texas. The private pilot was seriously injured and the helicopter was substantially damaged. The helicopter was registered to Jerry Trimble Helicopters and operated by a private individual under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight, which operated without a flight plan.

According to initial information provided by the pilot, while maneuvering, the engine had a spike in rpms followed by a loss of engine power. The pilot performed an autorotation to an open field. During the landing, the helicopter landed hard and rolled over. The tail boom and rotors were substantially damaged. The helicopter was retained for further examination.

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