ULYSESS, KS, USA
N67139
HILLER 12E
DURING A HELICOPTER AERIAL APPLICATION OPERATION, ACFT SUFFERED A MAIN ROTOR SYSTEM HUB FAILURE. PIC WAS UNABLE TO CONTROL THE ACFT AND AN UNCONTROLLED DESCENT RESULTED. ACFT STRUCK THE TERRAIN AND WAS SUBSTANTIALLY DAMAGED AND THE PIC SUFFERED MINOR INJURIES. PIC STATED THAT THE COMPLETE ROTOR HEAD, BLADES AND PADDLES, HAD JUST BEEN REINSTALLED, AND AFTER A FLIGHT OF LESS THAN ONE MILE, THE FAILURE OCCURRED. PIC FURTHER STATED THAT THE LINKAGE PIN THAT GOES THROUGH THE MAST AND PITCH CHANGE MECHANISM WAS NOT ALIGNED CAUSING THE FAILURE.
Source: NTSB Aviation Accident Database
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