NEW IBERIA, LA, USA
N2764F
BELL 206L-1
CREW PERFORMING PRACTICE TOUCHDOWN AUTOROTATIONS DURING A TRNG FLT. ON 4TH AUTOROTATION, ACFT TOUCHED DOWN WITH EXCESS GRND SPEED AND SKIDDED FOR APPROX 75' ON THE WET, SOFT GRASS. WHEN CREW APPLIED POWER BACK TO FLIGHT RPM THEY HEARD A GRINDING SOUND AND FELT A VIBRATION. VISUAL INSP REVEALED THAT THE TAILBOOM HAD SEPARATED AFT OF THE ATTACHMENTS DUE TO RESONANCE. THIS ACFT IS SUBJECT TO RESONANCE IF ROTOR RPM IS ALLOWED TO DECAY BELOW 70% DURING TOUCHDOWN AUTOROTATIONS OR DURING LENGTHY GROUND RUNS.
Source: NTSB Aviation Accident Database
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