STOCKTON, CA, USA
N43921
Texas Helicopter M47A WASP
THE PILOT LANDED THE HELICOPTER AND IT WAS RELOADED WITH CHEMICALS FOR ANOTHER AGRICULTURAL SPRAYING FLIGHT. SHORTLY AFTER DEPARTING THE LOAD SITE, THE PILOT HEARD A LOUD SOUND ENAMATE FROM THE ENGINE AREA FOLLOWED BY A SUDDEN LOSS OF POWER AND VIBRATION. THE PILOT IMMEDIATELY EXECUTED AN AUTOROTATION TO THE OPEN AREA, BUT MISJUDGED THE FLARE ALTITUDE AND EXPERIENCED A HARD LANDING WHICH CAUSED SUBSTANTIAL DAMAGE TO THE HELICOPTER. THE INVESTIGATION REVEALED THAT THE RIGHT MAGNETO CONTACT POINTS FAILED.
THE PILOT MISJUDGED THE ALTITUDE DURING THE FLARE/TOUCHDOWN PHASE OF THE AUTOROTATION. FACTORS RELATING TO THIS ACCIDENT ARE FAILURE OF THE RIGHT MAGNETO.
Source: NTSB Aviation Accident Database
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