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NTSB Final Report: Hughes 269A

Prior To The Accident Flight, The Pilot Reported Experiencing Vibrations In The Helicopter Analysis: Prior to the accident flight, the pilot reported experiencing vibrations in the helicopter. The pilot (who was also a mechanic) and another mechanic adjusted the main rotor dampers to address the issue. Following this adjustment, a 10-minute ground run was performed without any observed problems. The pilot then conducted a test flight during, which no issues were detected.

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