MEDINA, OH, USA
N9307F
HUGHES 269B
THE PILOT STATED THAT SHORTLY AFTER TAKEOFF, AT ABOUT 800 FEET AGL HE FELT A VIOLENT VIBRATION LASTING FOR 2 OR 3 SECONDS. HE REENTERED THE DOWNWIND LEG TO THE AIRPORT AND EXPERIENCED THE VIBRATION AGAIN. THE AIRCRAFT THEN ENTERED AN UNCONTROLLABLE SPIRAL TO THE RIGHT AND CONTACTED THE GROUND. INSPECTION OF THE TAIL ASSEMBLY REVEALED AN INFLIGHT SEPARATION OF THE TAIL ROTOR DRIVE SHAFT. EVIDENCE OF FATIGUE FRACTURE WAS NOTED IN THE TAIL ASSEMBLY ATTACH POINTS.
Source: NTSB Aviation Accident Database
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