CANEY, OK, USA
N1019M
CESSNA 150J
THE PLT & PASSENGER WERE PARTICIPATING IN AN ACTIVITY TO COMPETE IN DROPPING PAPER SACKS OF FLOWER IN A CIRCLE ON THE GROUND AT A FLY-IN. AFTER THE PLT HAD JUST COMPLETED A LOW PASS, WITNESSES NOTED THE ENG BEGAN RUNNING ROUGH, THEN THE ACFT DESCENDED & CRASHED. AN EXAM OF THE WRECKAGE REVEALED THE ACFT HAD IMPACTED IN A STEEP DESCENT. THE PROP BLADES WERE EQUALLY DISTORTED & BOTH BLADES CONTAINED ROTATIONAL SCUFF MARKS. A TEARDOWN OF THE ENG REVEALED THE #2 CYLINDER HAD A BLOWN EXHAUST MANIFOLD GASKET & THAT ITS RESPECTIVE EXHAUST VALVE WAS STUCK. ALSO, HEAT DAMAGE WAS NOTED ON THE #4 CYLINDER, DUE TO ESCAPING EXHAUST GASES.
BINDING OF THE #2 EXHAUST VALVE (STUCK VALVE), AND FAILURE OF THE PILOT TO MAINTAIN ADEQUATE AIRSPEED, WHICH RESULTED IN AN INADVERTENT STALL. A FACTOR RELATED TO THE ACCIDENT WAS: THE FAILED EXHAUST MANIFOLD GASKET.
Source: NTSB Aviation Accident Database
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