ASN Wikibase Occurrence # 155641
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| Date: | Saturday 27 April 2013 |
| Time: | 08:30 |
| Type: |  Bell 206B JetRanger II |
| Owner/operator: | Private |
| Registration: | N150SP |
| MSN: | 2216 |
| Year of manufacture: | 1977 |
| Total airframe hrs: | 10417 hours |
| Engine model: | Allison 250-C20 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | North of Shepherd, Montana -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Worden, MT |
| Shepherd, MT | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was maneuvering at low altitude during cattle herding operations. The helicopter suffered a wirestrike as it collided with power lines and subsequently impacted terrain. Power lines were found wrapped around the main rotor mast about 25 times. Postaccident examination of the airframe and engine revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation.
A small amount of acute blood was found in the left ventricle of the pilot’s brain, but no significant traumatic injuries were found; thus, it is likely the hemorrhage occurred during an acute premortem event. Given the autopsy findings and that the pilot knew the flying area well and would have likely known where the power lines were located, it is likely that he was impaired or incapacitated by an acute neurologic event in the seconds before impact with the power lines.
Probable Cause: The pilot’s loss of control while maneuvering during low-altitude operations due to sudden neurological impairment or incapacitation and the helicopter’s subsequent collision with power lines.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=150SP
History of this aircraft
Other occurrences involving this aircraft
| 5 March 2007 | N150SP | Private | 0 | Custer, Montana | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Apr-2013 07:34 | gerard57 | Added |
| 28-Apr-2013 17:39 | harro | Updated [Aircraft type, Source] |
| 30-Apr-2013 05:31 | Geno | Updated [Aircraft type, Registration, Cn, Operator, Source, Narrative] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 28-Nov-2017 14:31 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
| 18-Jan-2020 17:16 | harro | Updated [Source, Narrative] |
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