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Accident investigation report completed and information captured
Narrative: The pilot reported that he was conducting flybys to film a segment for a documentary. During his last run, he initiated a 150- to 180-degree climbing right turn to about 200 ft above the ground. After the turn, he attempted to neutralize the flight controls in preparation for a normal approach to land, but he was unable to move them. The helicopter remained in the same turn rate with the same collective pitch and cyclic input until ground impact. A postaccident examination of the helicopter revealed no evidence of preimpact mechanical malfunctions or failures that would have precluded normal operation. The reason for the flight control malfunction could not be determined.
Probable Cause: A flight control malfunction while maneuvering for reasons that could not be determined because postaccident examination revealed no evidence of a mechanical malfunction or failure that would have precluded normal operation.