IMPERIAL, TX, USA
N63MC
HILLER UH-12C
THE PLT REPORTED THAT WHEN HE WAS IN CRUISE FLT AT 300 FT AGL, A SUDDEN VIOLENT SHUDDER WENT THRU THE WHOLE HELICOPTER, THEN THE SHUDDER STOPPED. HE NOTED NO CHANGE IN THE FLIT CHARACTERISTICS OR ENG POWER. THE PLT ELECTED TO MAKE A PRECAUTIONARY LANDING BY FLYING DIRECTLY TO THE GROUND WITH NO HOVER. DURING THE LANDING, THE TAIL BOOM STRUCK THE GROUND, THEN THE MAIN ROTOR BLADES STRUCK THE TAIL BOOM. NO CAUSE FOR THE 'SHUDDER' WAS FOUND.
Source: NTSB Aviation Accident Database
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