COLORADO SPRING, CO, USA
N40DP
BELL 47G-3B-1
DURING TAKEOFF FROM A HIGH ALTITUDE, HIGH DENSITY ALTITUDE HELICOPTER PAD, INSUFFICIENT POWER WAS AVAILABLE TO MAINTAIN FLIGHT OUT OF GROUND EFFECT AND THE HELICOPTER SETTLED INTO ROUGH AND UNEVEN TERRAIN. THE MAIN ROTOR BLADES STRUCK THE TERRAIN DURING LANDING. DENSITY ALTITUDE WAS 11,700 FEET.
THE PILOT ATTEMPTING TO OPERATE THE HELICOPTER OUTSIDE THE DESIGN OPERATING ENVELOPE. FACTORS WERE: HIGH ALTITUDE, HIGH TEMPERATURE, AND HIGH DENSITY ALTITUDE.
Source: NTSB Aviation Accident Database
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