What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
On March 17th 2021 a commercial rated flight instructor made a part 91 personal flight in N28BU, an amateur built recreation of a Bucker Jungmann. After an uneventful flight of about 30 minutes landed on runway 10 at the Delaware county airport (kdlz). The touch-down was normal with the upwind wheel touching first, followed by the downwind (left) wheel and tailwheel. During the landing roll the a/c began a gentle turn to the right. Left rudder was quickly applied but had no effect. The a/c continued to turn to the right until having turned through more than 45 degrees the left landing gear leg collapsed. The aircraft came to rest on its right gear leg, left wingtip and nose.
As the FAA filed it
ON MARCH 17TH 2021 A COMMERCIAL RATED FLIGHT INSTRUCTOR MADE A PART 91 PERSONAL FLIGHT IN N28BU, AN AMATEUR BUILT RECREATION OF A BUCKER JUNGMANN. AFTER AN UNEVENTFUL FLIGHT OF ABOUT 30 MINUTES LANDED ON RUNWAY 10 AT THE DELAWARE COUNTY AIRPORT (KDLZ). THE TOUCH-DOWN WAS NORMAL WITH THE UPWIND WHEEL TOUCHING FIRST, FOLLOWED BY THE DOWNWIND (LEFT) WHEEL AND TAILWHEEL. DURING THE LANDING ROLL THE A/C BEGAN A GENTLE TURN TO THE RIGHT. LEFT RUDDER WAS QUICKLY APPLIED BUT HAD NO EFFECT. THE A/C CONTINUED TO TURN TO THE RIGHT UNTIL HAVING TURNED THROUGH MORE THAN 45 DEGREES THE LEFT LANDING GEAR LEG COLLAPSED. THE AIRCRAFT CAME TO REST ON ITS RIGHT GEAR LEG, LEFT WINGTIP AND NOSE.