ASN Wikibase Occurrence # 134871
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| Date: | Wednesday 18 February 2004 |
| Time: | 13:30 |
| Type: |  Bell 206B JetRanger |
| Owner/operator: | U.S. Forest Service |
| Registration: | N16MV |
| MSN: | 4040 |
| Year of manufacture: | 1989 |
| Total airframe hrs: | 4258 hours |
| Engine model: | Rolls-Royce 250-C20J |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Decatur, TX -
 United States of America
|
| Phase: | Take off |
| Nature: | Fire fighting |
| Departure airport: | Decatur, TX |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During lift off from soft uneven terrain, the rear portion of the helicopter's right main skid came in contact with the ground resulting in a dynamic rollover. The pilot reported that the terrain he departed from was "clumpy and lumpy with ruts of grass approximately 1 to 2 feet in height." As he started to lift the helicopter off the ground, he made a slow ascent rate. When the skids were about 1 foot above the ground, he said, "the helicopter stopped for a split second as if something had caught some portion of the right side of the helicopter and the helicopter began a slight lateral roll to the right." The pilot further reported that he recognized the problem too late as he applied full left cyclic and lowered the collective after the helicopter exceeded the critical angle of bank into the low skid to a point where the situation was unrecoverable, and it rolled 90 degrees to the right. No mechanical deficiencies with the engine or airframe were noted. The Rotorcraft Flying Handbook (FAA-H-8083-21), page11-7, described dynamic rollover as, "the pivoting around a skid or landing gear wheel of a helicopter causing it to reach its critical rollover angle. Beyond this point, main rotor thrust continues the roll and recovery is impossible."
Probable Cause: The pilot's failure to maintain control of the helicopter during liftoff after encountering dynamic rollover. A contributing factor was the rough and uneven terrain.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20040302X00255&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Sep-2014 11:24 | Aerossurance | Updated [Operator, Nature, Source, Narrative] |
| 02-Sep-2014 11:42 | Anon. | Updated [Operator, Source, Narrative] |
| 30-Nov-2016 22:27 | Aerossurance | Updated [Aircraft type, Operator] |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 07-Dec-2017 17:41 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Source, Narrative] |
| 01-May-2022 08:36 | Ron Averes | Updated [Operator] |
| 12-Nov-2022 02:40 | Ron Averes | Updated [Operator] |
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