MARSTONS MILLS, MA, USA
N1433Q
CESSNA 150L
THE ACFT WAS OBSERVED TO CLIMB AT A STEEP ANGLE TO 150-200 FT & THEN ENTER A SPIN. THE OWNER/PLT HAD JUST FINISHED INSTALLING STALL FENCES AS PART OF A STOL KIT THAT HE WAS IN THE PROCESS OF COMPLETING. EXAMINATION OF THE ACFT SHOWED A PARTIAL INSTALLATION OF THE STOL KIT WHICH INCLUDES LEADING EDGE CUFFS, STALL FENCES, AILERON SEALS & WING TIPS. ACCORDING TO THE FBO THE CUFFS WERE INSTALLED ON THE DAY OF THE ACCIDENT. THE STALL WARINING TRANSMITTER & AIR VENTS HADNOT BEEN INSTALLED. APPROXIMATELY 80 POUNDS OF TOOLS, CLOTHING, BED & CAMPING EQUIPMENT WERE FOUND IN THE BAGGAGE AREA. DURING ENG TEAR-DOWN THE DRAIN OIL WAS FOUND DIRTY & FELT GRITTY. THE OIL SCREEN & HOUSING CONTAINED METAL FLAKES, CARBON & SAND PARTICLES, & LINT. THE CAMSHAFT & CRANKSHAFT JOURNALS SHOWED EVIDENCE OF SCRATCHES & SCORE MARKS. THE #4 PISTON HAD A BROKEN OIL RING, APPROXIMATELY 1/5 OF IT WAS MISSING.
Source: NTSB Aviation Accident Database
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