As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT WING RIB WAS FOUND CRACKED AT STA 190.0. THIS LOCATION IS AT THE OUTBOARD HINGE LOCATION OF THE AILERON. THIS IS WHERE ALL THE BALANCE LEAD IS LOCATED. SUBMITTER SUGGESTED CAUSE AS FATIGUE DUE TO RIB FLEXING DURING TURBULENCE. AIRCRAFT IS USED FOR TRAINING. CRACK IS .8750 INCH LONG. REPAIRED BY REPLACMENT OF RIB WITH NEW.