SAN ANTONIO, TX, USA
N45387
CESSNA 150M
WHILE RETURNING TO ARPT THE PILOT EXPERIENCED A ROUGH RUNNING ENG WITH A DROP IN RPM. THERE WAS INSUFFICIENT POWER TO MAINTAIN FLT AND AN EMERGENCY LANDING WAS MADE ON A HIGHWAY. THE ACFT WAS DAMAGED DURING THE HARD LANDING. AN EXAM OF THE ENG REVEALED THAT THE #1 ROD ASSEMBLY HAD FAILED. THERE WAS EVIDENCE OF HIGH OIL CONSUMPTION. ONLY ABOUT 1 PINT OF OIL WAS FOUND REMAINING. THE 2ND RING ON PISTONS 2, 3 & 4 WERE OIL SCRAPER RINGS. THE 1ST AND 2ND RINGS ON EACH PISTON SHOULD HAVE BEEN COMPRESSION RINGS. ALSO, THERE WAS EVIDENCE OF OVERHEATING & THE #2, #3 & #4 ROD TO CRANKSHAFT BEARINGS WERE PITTED & GALLED.
Source: NTSB Aviation Accident Database
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