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NTSB Final (Modified): Robinson Helicopter R44

Loss Of Helicopter Control While Maneuvering, Which Resulted In Main Rotor Blade Contact With The Tailboom In Flight Analysis: **This report was modified on April 29, 2024. Please see the docket for the original report.**According to the operator, the lesson syllabus for the instructional helicopter flight included emergency procedures, equipment malfunctions, and vortex ring state (VRS) recognition and recovery. Flight track data, video, and a witness statement indicated that the helicopter was maneuvering at slow speeds about 2,000 ft mean sea level in the minute before the accident and shortly before a 4-ft section of the tailboom separated and the helicopter entered a spiraling descent to the ground.

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