ASN Wikibase Occurrence # 213965
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| Date: | Thursday 2 August 2018 |
| Time: | 09:20 LT |
| Type: |  Bell 47G-3B |
| Owner/operator: | Black Hill Aerial Adventure |
| Registration: | N347BH |
| MSN: | 2771 |
| Year of manufacture: | 1962 |
| Total airframe hrs: | 1998 hours |
| Engine model: | Lycoming TVO-435D1B |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Black Hills National Forest, Custer, SD -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Custer, SD (OSD9) |
| Custer, SD | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The commercial-rated pilot and flight instructor were completing familiarization training in the accident helicopter. After successful training flights the morning of the accident, the flight instructor decided to remove the dual controls from the helicopter, and one additional passenger was loaded before practicing hovering and a low-rpm recovery. On approach to land during the accident flight, about 100 feet above ground level (agl), the pilot noticed the rotor rpms drop below the normal operating range. The pilot increased throttle but was unable to recover rotor rpms within the normal range. The flight instructor stated that the helicopter lost a lot of altitude quickly and there was no time to recover. The pilot attempted a forced landing on the side of a roadway but caught the right skid on uneven ground, which led to a dynamic rollover and substantially damaged the tail section and tail rotor.
The flight instructor stated that the engine had no mechanical anomalies before the flight and that the engine had 'performed well' during both the accident flight and previous flights.
The helicopter likely lost power and altitude due to the pilot's mismanagement of rotor rpm resulting in the pilot having to attempt a forced landing on uneven terrain and a subsequent dynamic rollover.
Probable Cause: The pilot's mismanagement of rotor RPM and subsequent forced landing on uneven terrain which led to a dynamic rollover.
Accident investigation:
 |
|
Sources:
NTSB CEN18LA306
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N347BH
Location
Media:
USA - Black Hills National Forest, Custer, SD. Van struck during Black Hills Aerial Adventures training flight. Update, video. https://t.co/U95b2U4r2X pic.twitter.com/FgKLKMI3VX
— Planes Of Legend (@PlanesOfLegend) 3 août 2018
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Aug-2018 19:19 | Geno | Added |
| 02-Aug-2018 19:20 | Geno | Updated [Date] |
| 02-Aug-2018 19:58 | Iceman 29 | Updated [Time, Aircraft type, Source, Embed code, Narrative] |
| 02-Aug-2018 20:14 | Black Typhoon | Updated [Time, Aircraft type] |
| 02-Aug-2018 20:49 | Aerossurance | Updated [Aircraft type] |
| 03-Aug-2018 07:40 | Iceman 29 | Updated [Aircraft type, Embed code, Narrative] |
| 03-Aug-2018 07:59 | Iceman 29 | Updated [Source, Embed code, Narrative] |
| 03-Aug-2018 14:53 | harro | Updated [Aircraft type, Registration, Cn, Source, Embed code] |
| 03-Aug-2018 18:20 | Geno | Updated [Destination airport, Source] |
| 09-Jul-2022 05:20 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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