What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Aircraft is an experimental amateur built in phase one testing. The aircraft departed cno, stayed in the pattern and upon landing on 26L developed a vibration in the right main landing gear. The right main landing gear collapsed causing the right wingtip to contact the ground creating a hard right turn placing a side load that collapsed the left main landing gear. Minor aircraft damage, no fire, no fatalities or injuries.
As the FAA filed it
AIRCRAFT IS AN EXPERIMENTAL AMATEUR BUILT IN PHASE ONE TESTING. THE AIRCRAFT DEPARTED CNO, STAYED IN THE PATTERN AND UPON LANDING ON 26L DEVELOPED A VIBRATION IN THE RIGHT MAIN LANDING GEAR. THE RIGHT MAIN LANDING GEAR COLLAPSED CAUSING THE RIGHT WINGTIP TO CONTACT THE GROUND CREATING A HARD RIGHT TURN PLACING A SIDE LOAD THAT COLLAPSED THE LEFT MAIN LANDING GEAR. MINOR AIRCRAFT DAMAGE, NO FIRE, NO FATALITIES OR INJURIES.