KLAMATH, CA, USA
N545HA
HILLER UH12J3
THE HELICOPTER WAS RETURNING TO A PRIVATE LANDING PAD AFTER A RECONAISANCE FLIGHT PRIOR TO SPRATING. AT ABOUT 10FT AGL AFTER FLARING AND LEVELING THE PILOT COULD NOT CONTROL A DRIFT AND ROLL TO THE LEFT. THE ROTOR BLADES STRUCK THE GROUND WITHIN ABOUT ONE SECOND. THE INVESTIGATION REVEALED THAT A SELF LOCKING NUT WAS MISSING AND A BOLT HAD BACKED OUT OF THE UPPER FIREWALL BELLCRANK ASSEMBLY RESUTLTING IN THE LOSSOF CYCLIC CONTROL.
Source: NTSB Aviation Accident Database
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