As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)DURING A 600 HOUR INSPECITON THE LEFT HAND AILERON WAS FOUND TO HAVE A 2 INCH CRACK IN THE MAIN SPAR AT THE INBOARD HINGE MOUNT AREA. A SECOND AILERON WAS PURCHASED ONLY TO FIND THAT A 1.5 INCH CRACK EXISTED IN IT. THE RIGHT HAND AILERON WAS FOUND TO HAVE A CRACK JUST 164 HOURS PRIOR TO THIS OCCURRENCE. SUBMITTER RECOMMENDS INSPECTING THESE AREAS AS PER MAINTENANCE MANUAL.