ASN Wikibase Occurrence # 293068
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| Date: | Tuesday 13 September 2005 |
| Time: | 11:50 LT |
| Type: |  Bell 47G-3B-1 |
| Owner/operator: | Helicopter Roundup Service LLC |
| Registration: | N24SD |
| MSN: | 3671 |
| Year of manufacture: | 1967 |
| Total airframe hrs: | 8856 hours |
| Engine model: | Lycoming TVO-435-B1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Rock Springs, Wyoming -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Rock Springs-Sweetwater County Airport, WY (RKS/KRKS) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
According to the pilot, he was maneuvering at approximately 25 feet agl. The pilot stated that he heard a grinding noise and the "helicopter yawed to the right a couple of times." He stated that the engine began to overspeed and he initiated an autorotation. The pilot stated that the helicopter impacted the ground hard, resulting in substantial damage. An examination, revealed that all six shearbolts had failed. Examination of the fracture faces of the six shear bolts revealed signatures consistent with a shearing action. The examination of the helicopter airframe, engine, transmission, and remaining systems revealed no anomalies.
Probable Cause: the pilot's failure to maintain control of the helicopter during the attempted autorotation after he experienced an engine overspeed that occurred for reasons undetermined.
Accident investigation:
 |
|
Sources:
NTSB DEN05LA137
History of this aircraft
Other occurrences involving this aircraft
| 11 April 2008 | N24SD | Helicopter Roundup Service, LLC | 0 | 25 mi S of Denio, NV | |
sub |
| Heavy landing | ||||||
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Oct-2022 15:39 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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