On July 21, 2001, a Pilatus PC-6/B2-H4 (registration N2TS) operated by Thomas M. Siebel was involved in an aviation accident near Great Falls, MT. Investigators recorded the probable cause as: Pilot's failure to maintain directional control of the aircraft while landing. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A tailwheel-equipped airplane ground looped during landing roll-out on runway 03 at Great Falls after the pilot unlocked the tailwheel, resulting in substantial damage to the right wing. No mechanical issues were reported.
Incident Details
A tailwheel-equipped aircraft experienced a ground loop during the landing roll-out on runway 03. According to a written report from the operator, the pilot unlocked the airplane's tailwheel shortly after touchdown. Upon releasing the tailwheel lock, directional control was lost, and the aircraft subsequently ground looped. The event resulted in substantial damage to the right wing.
Weather Conditions
The 1257 METAR observation at Great Falls reported wind from 070 degrees at 6 knots.
Aircraft and Operator Report
The accident report submitted by the operator indicated that there were no mechanical malfunctions or failures with the aircraft that contributed to the accident. The report did not specify any other contributing factors.
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