Event
During a precautionary landing to a paved access road, a Cessna 140 nosed over while on the landing roll. The aircraft subsequently came to rest in the soft shoulder adjacent to the road.
Pilot Report
The pilot indicated that while in cruise flight, the oil pressure and oil temperature began to drop for unknown reasons. Unable to determine the wind direction, the pilot decided to land to the southwest on the road. During the landing roll, the aircraft encountered a right rear quartering crosswind. The pilot estimated the winds from the north-northeast at 10 knots, gusting to 15 knots. According to the pilot, the aircraft weathervaned into the wind and nosed over in the soft shoulder.
Examination
An examination of the aircraft revealed oil covering the belly, indicating an oil leak. The engine was subsequently examined, and investigators noted no external damage that would have caused an oil leak. The interior of the engine cowling was dry. It was also noted that the engine was equipped with a wobble-type quick drain of unknown vintage.