What happened
A pilot employed by the National Park Service was conducting a flight intended to regain proficiency in a Piper PA-18 following a three-month furlough. The pilot had not flown during the period of the furlough, and his total flight experience in this specific aircraft type was approximately five hours.
During the fourth landing of the flight, the pilot lost directional control of the airplane while on the landing roll. This loss of control caused the aircraft to ground loop to the left. The incident resulted in substantial damage to the airframe. There were no injuries reported.