Cessna 501 Citation I

The certificated commercial pilot picked up his newly painted airplane for a visual flight to the home base. About 17 miles south of the departure airport, witnesses initially observed the airplane in a 90 degree right bank. It continued to roll to an inverted position while simultaneously nosing down to a near vertical descent. The pilot's second class medical certificate application (July 7, 1997) indicated 3,700 hours flight time. A flight log indicted the pilot flew this aircraft 6.4 hours during the 60 days preceding the accident. No evidence was found that the pilot had not obtained sufficient rest before the flight. There was no evidence found to either suggest a medical cause for incapacitation or to rule out incapacitation for medical reasons. Aircraft maintenance records did not reveal any open discrepancies. All of the airplane was accounted for in the wreckage debris. No evidence of an in-flight fire and/or explosion, or in-flight mechanical and/or flight control malfunction was found.