MONTROSE, CO, USA
N2243W
Bell 47G-3B-2
The commercial-rated student pilot was practicing power recovery autorotations with a flight instructor (CFI) monitoring. The rotor rpm was allowed to deteriorate, which resulted in a hard landing. The main rotor blades flexed downward and severed the tail boom from the helicopter. Density altitude at the time was 11,300 feet.
On August 19, 1997, at 1645 mountain daylight time, a Bell 47G-3B-2 helicopter, N2243W, made a hard landing during an autorotation training flight 5 miles north of Montrose, Colorado. The certified flight instructor pilot and commercially certificated student were not injured and the helicopter sustained substantial damage. The flight was being conducted under Title 14 CFR Part 91 as an instructional flight and no flight plan was filed. According to the flight instructor, the student was practicing power recovery autorotations and had completed nine. On the 10th autorotation, at approximately 20 feet, the student brought in power and leveled the aircraft and the instructor said he felt the throttle being applied. The low rotor horn sounded and the aircraft touched down hard causing the main rotor to flex and severe the tail boom. Examination of the engine and drive train, by an FAA inspector, following the accident provided no evidence of preimpact failure or malfunction. Density altitude at the time was 11,300 feet above mean sea level and according to the flight instructor, they were operating into the wind, which was westerly at 10 to 15 knots.
failure of the flight instructor (CFI) to properly supervise the flight and ensure that adequate rotor rpm was maintainted during the autorotation/landing. The high density altitude was a related factor.
Source: NTSB Aviation Accident Database
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