SUMMERVILLE, SC, USA
N9419F
HUGHES 269B
THE HELICOPTER WAS BEING USED IN CONTROLLED BURNING OF TIMBERLAND. WHILE BEING OPERATED AT AN ALT OF APRX 20 FT OVER WIND ROWS OF ORGANIC MATERIAL, THERE WAS A PARTIAL LOSS OF ENG POWER. THE PLT STATED THAT HE WAS UNABLE TO MAINTAIN A HOVER, SO HE LANDED ON THE ROUGH TERRAIN. AFTER TOUCHDOWN, THE HELICOPTER ROLLED OVER & THE MAIN ROTOR BLADES CONTACTED THE GROUND, DURING AN EXAM OF THE ENG, ALL 8 SPARK PLUGS WERE FOUND WITH EVIDENCE OF LEAD FOULING. IN THE #4 CYLINDER, THE ELECTRODES OF THE BOTTOM PLUG WAS COMPLETELY BRIDGED WITH LEAD. THE PLT STATED THAT THE TOP PLUG IN THAT CYLINDER WAS DIRTY WITH CARBON.
Source: NTSB Aviation Accident Database
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