TAHOLAH, WA, USA
N8306F
HUGHES 369D
THE ACFT HAD LIFTED OFF DURING AN EXTERNAL LOAD OPERATION WHEN THE PLT FELT A 'VIBRATION/SHUDDER'. THE RIGHT SKID CONTACTED THE GROUND AND THE HELICOPTER ROLLED OVER DURING AN ATTEMPT TO MANEUVER THE HELICOPTER AWAY FROM GROUND PERSONNEL. INSPECTION REVEALED THE MAIN ROTOR DRIVE SHAFT SEPARATED APRX 3 INCHES FROM THE SPLINED END OF THE SHAFT. METALLURGICAL EXAMINATION DISCLOSED THE SHAFT FAILED FROM UNIDIRECTIONAL FATIGUE INITIATING FROM SURFACE PITS ON THE SHAFT.
Source: NTSB Aviation Accident Database
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