KANSAS CITY, MO, USA
N640KC
SCHWEIZER 269C
WHILE ON A ROUTINE NIGHT PATROL THE POLICE HELICOPTER EXPERIENCED THE LOSS OF THE LARGE CLEVIS PIN IN THE CLUTCH CONTROL SPRING ASSEMBLY. THE LOSS OF THE SPRING ASSEMBLY DISCONNECTED THE POWERPLANT FROM THE ROTOR SYSTEM. THE PILOT INITIATED AN AUTOROTATION. THE TERRAIN UNDERLYING THE LANDING ATTEMPT WAS A RAVINE WITH HIGH TREES. THE PILOT WAS NOT ABLE TO JUDGE THE DISTANCE BETWEEN THE HELICOPTER AND THE GROUND TO SUCCESSFULLY EFFECT AN AUTOROTATIONAL LANDING.
THE PILOT-IN-COMMAND'S MISJUDGING THE DISTANCE DURING THE AUTOROTATION.
Source: NTSB Aviation Accident Database
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