MILWAUKEE, WI, USA
N18SA
CESSNA 207
AFTER PREHEATING THE ENG THE PLT TOOK OFF AND DURING CLIMB THE CABIN FILLED WITH SMOKE AND THE ENG STOPPED. A FORCED LANDING WAS MADE ON A CITY STREET DURING WHICH THE LEFT WING CONTACTED A SIGN POLE. POST ACCIDENT TEARDOWN OF THE ENG DISCLOSED THAT AN OIL TEMP CONTROL VALVE REQUIRED TO RETAIN THE ENG OIL IN THE CRANKCASE UNTIL PROPER OPERATING TEMP IS ATTAINED WAS NOT INSTALLED. WITHOUT THIS TEMP VALVE, OIL IS PERMITTED TO FLOW THROUGH THE OIL COOLER. THE PLT ALSO FAILED TO VISUALLY CHECK THE VISCOSITY OF THE OIL AFTER PREHEATING THE ENG.
Source: NTSB Aviation Accident Database
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