TUCSON, AZ, USA
N88XS
STERN ROTORWAY EXEC 162F
After flying for about 1 hour, the student pilot hovered 2 feet above ground level about 50 yards away from a witness. The local wind speed had varied between calm and 5 knots during the flight. The witness and pilot reported that suddenly an estimated 25 knot (maximum) wind gust developed. The gust pushed the helicopter sideways, the pilot lost control, a skid contacted the ground, and the helicopter rolled over onto its side.
On February 5, 1999, at 1343 hours mountain standard time, a homebuilt Rotorway Exec 162, N88XS, owned and operated by the pilot, encountered a wind gust at the Ryan Field, Tucson. The student pilot reported that he had been hovering in the area and was not having any difficulty handling the controls when suddenly he lost control, the right skid impacted the ground, and the experimental helicopter rolled over. The helicopter was substantially damaged during the flight, which was performed under 14 CFR Part 91, and the student pilot received a minor injury. Visual meteorological conditions prevailed at the time of the solo instructional flight that originated from the airport about 1230. In the pilot's report, he stated that during the hour preceding the accident the local wind speed was between 0 and 3 miles per hour. However, suddenly "a severe gust of wind (estimated at 25 - 30 mph) came from 90 degrees . . . and hit me on my left side." A witness, who was standing on the ramp about 50 yards from the accident site, reported observing the helicopter hovering 2 feet above the ground when an estimated 20 to 25 knot wind gust pushed the helicopter sideways. Thereafter, its right skid touched the ground and it rolled over.
The sudden development of a wind gust which resulted in the pilot losing control, and the helicopter's dynamic rollover when a skid contacted the ground.
Source: NTSB Aviation Accident Database
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