COUNCIL BLUFFS, IA, USA
N1040S
HUGHES TH-55A
THE STUDENT, WHO WAS A RATED HELICOPTER PLT, AND A HELICOPTER INSTRUCTOR (CFI) WERE ON A DUAL INSTRUCTIONAL FLT. AFTER TAKEOFF, THE AIRCREW REMAINED IN A RIGHT TRAFFIC PATTERN FOR RWY 13 , INTENDING FOR THE STUDENT TO MAKE A 180 DEG AUTOROTATION TO A PARALLEL TAXIWAY. THE STUDENT OVERSHOT THE AUTOROTATIVE TURN & THE CFI INSTRUCTED HIM TO CONTINUE THE APCH TO A GRASS AREA BETWEEN THE TAXIWAY & RWY. THE CFI REPORTED THAT THE TOUCHDOWN WAS SMOOTH WITH ZERO AIRSPEED. HOWEVER, THE HELICOPTER BEGAN VIBRATING & TURNED TO THE LEFT. REPORTEDLY, THE MAIN ROTOR BLADES HAD SEVERED THE TAIL BOOM.
Source: NTSB Aviation Accident Database
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