# Accident 20050913020519A: Bell 47G3B1, Rock Springs, WY, September 13, 2005

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: September 13, 2005, 11:50 local time
- Place: Rock Springs, WY
- Damage: Substantial damage
- Phase of flight: Forced/Precautionary Landing
- Operating rules: General operating rules (Part 91)
- Location: 41.6028° N, 109.0750° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=41.6028&lon=-109.0750&mi=10
- Aircraft: N24SD, a cancelled registration (https://openairdocs.org/deregistered/N24SD-2008-07-14) (OpenAirDocs)
- Registry model: Bell 47G-3B-1 (registry code 1181028, https://openairdocs.org/model/bell-47g-3b-1) (OpenAirDocs)
- Registry engine: Lycoming TVO-435-GIA (registry code 41526, https://openairdocs.org/engine/lycoming-tvo-435-gia) (OpenAirDocs)
- Reported make and model: BELL 47G3B1
- People aboard: 2
- Fatal injuries: 0
- Pilot flight hours: 2,940 total, 1,540 in this make and model, 309 in the last 90 days
- NTSB investigation: [NTSB DEN05LA137](https://openairdocs.org/ntsb/DEN05LA137) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20050913020519A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(-23) INSPECTION OF THE AIRCRAFT REVEALED THAT THE UPPER PLANETARY GEAR IN THE TRANSMISSION FAILED, THIS CAUSED AN ENGINE OVERSPEED AND EMERGENCY LANDING. DURING A WILD HORSE ROUNDUP WHEN THE AIRCRAFT HAD JUST MOVED FORWARD FROM A HOVER AT ABOUT TWENTY-FIVE FEET AGL, THE PILOT HEARD A GRINDING NOISE. THE ENGINE BEGAN TO OVERSPEED AND AN AUTOROTATION WAS INITIATED. THE AIRCRAFT LANDED HARD CAUSING SUBSTANTIAL DAMAGE TO THE AIRCRAFT. INSPECTION OF THE AIRCRAFT REVEALED THAT THE UPPER PLANETARY GEAR FAILED.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB DEN05LA137](https://openairdocs.org/ntsb/DEN05LA137), Sep 13, 2005: Bell 47G-3B-1 (N24SD), Rock Springs, WY, substantial damage. 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.

## Other reports on N24SD (1)

Matched to the same aircraft by N-number and date.

- [Accident 20080411836879A](https://openairdocs.org/incident/20080411836879A), Apr 11, 2008: Bell 47 (N24SD), Dinio, NV, Substantial damage. (-23) Accident occurred on a predator eradication flight (coyote). After culling a coyote they returned to the carcass to determine status of same when at…

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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