As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIVETS PULLED AT BUTT RIB LT AND RT WING ON TOP SKIN. RIVETS PULLED THROUGH RIB NOT SKIN. AMERICAN CHAMPION CHANGED RIB THICKNESS AND FASTENER TYPE AND SPACING 1.5 YEARS AGO. UNKNOWN NUMBER OF WINGS OUT THERE WITH THIS PROBLEM. NEED SL OR AD.