ASN Wikibase Occurrence # 30042
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| Date: | Thursday 31 August 2000 |
| Time: | 09:30 |
| Type: |  Bell 47G-2 |
| Owner/operator: | Private |
| Registration: | N67083 |
| MSN: | 2280 |
| Total airframe hrs: | 5558 hours |
| Engine model: | Lycoming O-435-A1F HC |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Spring Brook, Wisconsin -
 United States of America
|
| Phase: | En route |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter impacted the terrain following a loss of tail rotor effectiveness. The pilot reported he just completed a turn in order to begin a swath run when he experienced a loss of tail rotor effectiveness. He attempted to control the helicopter, however it continued to rotate until it impacted the terrain in a clearing in a wooded area. Post accident examination revealed a failure of the tail rotor drive gear assembly. The drive gear shaft was fractured at the underside of the bevel gear. Metallurgical examination revealed fatigue was found over 90 to 95 percent of the shaft cross sectional area. The fatigue cracking origin was on the cylindrical portion of the shaft surface, adjacent to the keyway slot.
Probable Cause: A fatigue failure of the tail rotor drive gear shaft.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X21693&key=1
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 19-Oct-2011 16:48 | Dr. John Smith | Updated [Time, Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Destination airport, Source, Damage, Narrative] |
| 26-Aug-2014 14:06 | A.J.Scholten | Updated [Narrative] |
| 21-Dec-2016 19:16 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Dec-2016 19:20 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 12-Dec-2017 19:04 | ASN Update Bot | Updated [Departure airport, Destination airport, Source, Narrative] |
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