What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Acft ground looped on landing and sustained substantial damage. (.4)on the landing rollout the airplane veered to the left. An attempt was made to correct the travel to the left; however, a turn was initiated and the right wheel broke free. The right landing gear axle dug into the ground, and the airplane ground looped after the right wing tip struck the runway. The right axle was examined and found to have preexisting multiple-origin fatigue fractures. (-23)June 24, 1999, a Cessna 120, N2651N, was involved in a series of take off amn landings at Chino Airport. According to the student pilot, during landing roll out the aircraft suddenly veered to the left about ninety degrees and then continued on around approximately another forty-five to ninety degrees ending up about 180 degrees from the direction of landing. The pilot stated that during this unexplained sudden left turning motion of th aircraft he made unsuccessful attempts to keep the aircraft moving in a straight forward diection by using both the brake system and the rudder system. During the severe ground loop effect to the left, the right axle broke off and the right main gear leg collapsed resulting in substantial damage to the aircraft. The student pilot, the sole occupant, was not injured.
As the FAA filed it
ACFT GROUND LOOPED ON LANDING AND SUSTAINED SUBSTANTIAL DAMAGE. (.4)ON THE LANDING ROLLOUT THE AIRPLANE VEERED TO THE LEFT. AN ATTEMPT WAS MADE TO CORRECT THE TRAVEL TO THE LEFT; HOWEVER, A TURN WAS INITIATED AND THE RIGHT WHEEL BROKE FREE. THE RIGHT LANDING GEAR AXLE DUG INTO THE GROUND, AND THE AIRPLANE GROUND LOOPED AFTER THE RIGHT WING TIP STRUCK THE RUNWAY. THE RIGHT AXLE WAS EXAMINED AND FOUND TO HAVE PREEXISTING MULTIPLE-ORIGIN FATIGUE FRACTURES. (-23)JUNE 24, 1999, A CESSNA 120, N2651N, WAS INVOLVED IN A SERIES OF TAKE OFF AMN LANDINGS AT CHINO AIRPORT. ACCORDING TO THE STUDENT PILOT, DURING LANDING ROLL OUT THE AIRCRAFT SUDDENLY VEERED TO THE LEFT ABOUT NINETY DEGREES AND THEN CONTINUED ON AROUND APPROXIMATELY ANOTHER FORTY-FIVE TO NINETY DEGREES ENDING UP ABOUT 180 DEGREES FROM THE DIRECTION OF LANDING. THE PILOT STATED THAT DURING THIS UNEXPLAINED SUDDEN LEFT TURNING MOTION OF TH AIRCRAFT HE MADE UNSUCCESSFUL ATTEMPTS TO KEEP THE AIRCRAFT MOVING IN A STRAIGHT FORWARD DIECTION BY USING BOTH THE BRAKE SYSTEM AND THE RUDDER SYSTEM. DURING THE SEVERE GROUND LOOP EFFECT TO THE LEFT, THE RIGHT AXLE BROKE OFF AND THE RIGHT MAIN GEAR LEG COLLAPSED RESULTING IN SUBSTANTIAL DAMAGE TO THE AIRCRAFT. THE STUDENT PILOT, THE SOLE OCCUPANT, WAS NOT INJURED.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.