About 2036 eastern time, a Cessna 310L crashed while making an instrument approach to Cortland County Chase Airport. The pilot was killed. The pilot was cleared for the VOR-A approach. Approximately 13 miles south of the airport at 3,600 feet, the pilot requested the controller to advise him when the airplane was over the final approach fix. The controller responded he would be unable due to the lack of radar coverage in the area, so the pilot cancelled his IFR clearance. About 5 minutes later, the airplane impacted trees approximately 5.5 miles south of the airport. Witnesses reported seeing the airplane at 80 to 300 feet agl shortly before the crash. One witness said visibility was approximately 0.75 mile in heavy rain.