(Franklin County, IN)--The NTSB has released a preliminary report on the plane crash in Franklin County last December that killed three people. A mechanical failure is the primary cause of the crash. Just before the crash, the pilot reported a partial engine failure. He was slowly descending over Batesville and wanted to land at the Batesville airport, but it was closed and there were no runway lights. The plane then went down in a wooded area in western Franklin County.