MIAMI, FL, USA
N6772D
BELL 47G-2
THE INSTRUCTOR PLT STATED THAT THE HELICOPTER BEGAN TO VIBRATE WHILE THE STUDENT PLT WAS MANEUVERING IT DURING AN INSTRUCTIONAL FLT. THE INSTRUCTOR PLT THEN EXECUTED A FORCED LANDING AND UPON TOUCHDOWN THE MAIN ROTOR BLADES CONTACTED THE GROUND. INSPECTION OF THE HELICOPTER REVEALED THAT THE BOLT WHICH ATTACHES ONE SIDE OF THE SWASHPLATE TO THE SCISSOR ASSY BROKE RESULTING IN THE LOSS OF PITCH CONTROL OF THE MAIN ROTOR BLADES.
Source: NTSB Aviation Accident Database
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