ASN Wikibase Occurrence # 290849
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| Date: | Friday 21 August 2015 |
| Time: | 11:00 LT |
| Type: | Revolution Mini-500 |
| Owner/operator: | |
| Registration: | UNREG |
| MSN: | 001 |
| Year of manufacture: | 2015 |
| Total airframe hrs: | 30 hours |
| Engine model: | Rotax 582UL |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Butler, Missouri -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Butler Airport, MO (BUM/KBUM) |
| Butler Airport, MO (BUM/KBUM) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The private pilot had just departed the airport in the unregistered, amateur-built helicopter. While in the traffic pattern, the helicopter shuddered and made a noise the pilot described as sounding like a tire blowing out on a car. He performed an autorotation to a soybean field and leveled the helicopter at 5 ft above the ground (2 ft above the crop), although he stated that he believed that the helicopter's tail rotor may have been in the crop, which caused instability. When the rotor speed bled off, the helicopter settled onto its right skid and rolled over. Postaccident examination did not reveal any preimpact anomalies, but a complete examination was not performed. Although the pilot believed that the one-way clutch, part of the power transmission system of the helicopter, had failed, which would have resulted in a loss of power to the rotor system, he had not disassembled the transmission to verify this. Additionally, the pilot's improper flare during the autorotation resulted in a premature loss of rotor speed, and the subsequent rollover.
Probable Cause: The pilot's failure to attain a proper landing flare following an autorotation for reasons that could not be determined based on available information.
Accident investigation:
 |
|
Sources:
NTSB CEN15LA396
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Oct-2022 06:25 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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