Incident Overview
A pilot experienced smoke in the cockpit while approaching Cordova. Upon detecting the smoke, the pilot reduced power and initiated a modified approach to Runway 9, which was nearest to his position. When he attempted to add power, the engine did not respond. The pilot then turned and landed on a road rather than attempting to reach the runway.
Environmental Conditions
The temperature at the time was 40°F, with a dew point of 34°F. The pilot was uncertain how long the engine had been throttled before he added power and did not recall whether he applied carburetor heat when he turned toward the airport.
Findings
Examination of the aircraft revealed that the oil line to the input side of the oil cooler was worn and leaking. This leak allowed oil to escape and spray onto the engine. Stains were found on the exhaust system, indicating that some fluid had burned.
Conclusion
The investigation identified a worn and leaking oil line that resulted in oil spraying onto the engine. Evidence of burning fluid was observed on the exhaust system. No probable cause was explicitly stated in the source.