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ASN Wikibase Occurrence # 89239
Last updated: 13 September 2021
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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:Skymission LLC
Registration: N78BR
MSN: 4001
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Belgrade, Montana -   United States of America
Phase: Landing
Departure airport:Bozeman, MT (BZN)
Destination airport:Bozeman, MT (BZN)
Investigating agency: NTSB
The pilot practiced several maneuvers and then entered a straight-in practice autorotation. He pointed the helicopter into the wind at 800 feet above ground level near midfield and above the runway. He reduced the throttle to flight idle and lowered the collective while gently flaring the nose of the helicopter to set up the appropriate main rotor rpm and airspeed. He reported that he monitored those parameters carefully during the descent and noted that they remained well within the normal range. At the bottom of the descent, the pilot flared a little high to allow a margin of safety for tail boom clearance as he was planning a power recovery from the autorotation. The pilot stated that he did not add power at that point and that there was inadequate rotor inertia to dampen the landing, even though he applied full collective deflection. The helicopter hit hard and sustained substantial damage. The aft portion of the tail boom and tail rotor separated due to a main rotor blade contact and the skids were damaged.
Probable Cause: The pilotís inadequate use of throttle during the practice autorotation that resulted in a hard landing.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 4 months
Download report: Final report

Revision history:

20-Jan-2011 07:13 gerard57 Added
29-Jan-2011 20:00 bizjets101 Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Departure airport, Destination airport, Source, Narrative]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
26-Nov-2017 18:47 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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