Monday, September 19, 2016

Robinson R44 II, November Alpha LLC, N46HF: Accident occurred September 14, 2016 in Cedar City, Iron County, Utah

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

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

FAA Flight Standards District Office: FAA Salt Lake City FSDO-07

NOVEMBER ALPHA LLC:   http://registry.faa.gov/N46HF

NTSB Identification: GAA16CA488
14 CFR Part 91: General Aviation
Accident occurred Wednesday, September 14, 2016 in Cedar City, UT
Probable Cause Approval Date: 04/04/2017
Aircraft: ROBINSON HELICOPTER COMPANY R44 II, registration: N46HF
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.

According to the flight instructor in the skid-equipped helicopter, he was teaching the student to hover over an asphalt helipad. He reported that he transferred the flight controls to the student and directed the student to maintain a stable hover. The nose pitched down, and a right lateral drift occurred. The flight instructor immediately grabbed the flight controls, but the front of the right skid contacted the ground. The main rotor blades then struck the ground, and the helicopter rolled onto its right side. The helicopter sustained substantial damage to the tailboom, fuselage, and the main rotor blades. 

The instructor reported that there were no preaccident mechanical malfunctions or anomalies with the helicopter that would have prevented normal operation.
The meteorological aerodrome report at the airport where the accident occurred reported that the wind was 200° at 9 knots, gusting to 18 knots.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The flight instructor’s delayed remedial action while providing hover instruction in gusting wind conditions, which resulted in dynamic roll-over.

The instructor reported that there were no mechanical malfunctions or anomalies with the helicopter during the flight that would have prevented normal flight operation.

The meteorological aerodrome report at the airport where the accident occurred reported that the wind was out of 200° true at 9 knots, gusting to 18 knots.

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