Accident Summary
During a practice session of touch-and-go landings, a certified flight instructor (CFI) rated pilot and a CFI rated passenger were on board. The pilot reported that the winds were light and variable at the time of the accident.
Sequence of Events
On the last touchdown, the tail wheel chattered and the aircraft swerved to the left. The pilot applied some right rudder, which did not correct the swerve. The pilot then applied the right brake. Subsequently, the aircraft swerved to the right and control was lost. The aircraft ground looped to the right.
Damage
The ground loop resulted in damage to the left main landing gear and the collapse of the tail wheel. No information about injuries was provided in the source.
Additional Information
The source does not specify the aircraft type, registration, date, operator, location, or number of occupants beyond the two CFI rated individuals. No ATC involvement was mentioned.