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ASN Wikibase Occurrence # 134871
Last updated: 14 November 2020
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Type:Silhouette image of generic B06 model; specific model in this crash may look slightly different
Bell 206B JetRanger
Owner/operator:U.S. Forestry Services
Registration: N16MV
C/n / msn: 4040
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Decatur, TX -   United States of America
Phase: Take off
Departure airport:Decatur, TX
Destination airport:
Investigating agency: NTSB
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.



Revision history:

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]

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