What happened
During a routine flight, the pilot was executing a wheel landing on runway 14. The landing proceeded normally until the tail wheel made contact with the ground. At that moment, the Cessna (type not specified in source) veered sharply to the right, resulting in a ground loop. The aircraft traveled approximately 180 degrees from the original runway heading and came to a stop roughly 3 feet outside of the runway edge.
The incident resulted in damage to the left landing gear and the left wing tip. No injuries were reported following the event.
The investigation
An examination of the weather conditions at SJN revealed that wind directions had been variable throughout much of the morning, with speeds remaining below 4 knots. A METAR issued approximately six minutes before the accident indicated winds from a magnetic heading of 290 degrees at 5 knots. Prior to the ground loop, the pilot reported no mechanical issues or malfunctions regarding the aircraft.