PADUCAH, KY, USA
N6141S
AIR & SPACE 18A
THE PLT REPORTED THAT HE SPUN THE ROTOR UP TO 350 RPM IN PREPARATION FOR A MAXIMUM PERFORMANCE TAKEOFF. DURING TAKEOFF ROLL, THE GYROPLANE EXPERIENCED GROUND RESONANCE. THE PLT REDUCED THE THROTTLE TO IDLE, BUT THE OSCILLATIONS CONTINUED AND THE RT MAIN LDG GEAR COLLAPSED. THE ROTOR SUBSEQUENTLY STRUCK THE RUNWAY AND TORE LOOSE FROM THE GYROPLANE. THE PILOT NOTED THAT SLIGHT BARELY NOTICEABLE UNDULATIONS EXISTED IN THE PORTION OF THE RWY SURFACE USED DUIRNG THE TAKEOFF ROLL. THE FAA APPROVED FLT MANUAL (AFM) FOR THE GYROPLANE CONTAINS NO EMERGENCY OPERATION PROCEDURES FOR GROUND RESONANCE. THE ACFT OPERATOR REPORTED THAT THE PLT WAS TAUGHT TO TAKEOFF IF SUFFICIENT ROTOR RPM WAS AVAILABLE IN THE EVENT OF GROUND RESONANCE. THE AFM STATES THAT ANY AIRSPEED MAY BE USED FOR TAKEOFF IF THE ROTOR DOES NOT DECAY BELOW 140 RPM.
Source: NTSB Aviation Accident Database
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