NTSB Identification: SEA85LA053.
The docket is stored on NTSB microfiche number 27195.
Accident occurred Monday, February 04, 1985 in TAHOLAH, WA
Aircraft: HUGHES 369D, registration: N8306F
Injuries: 1 Minor.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
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.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:ROTOR DRIVE SYSTEM,MAIN ROTOR MAST(DRIVE SHAFT)..FATIGUE
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