As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PIPER SB 974 HAD BEEN COMPLETED AND HINGE P/N 74461-02 HAD BEEN INSTALLED. THIS WAS TERMINATING ACTION FOR AWD 96-21-03. THE CRACK WAS FOUND DURING A RE-SKINNING OF THE AILERON. FOUR OTHER AILERONS ON THE FLEET WERE INSPECTED AND THREE WERE FOUND CRACKED. REF: SDR CA980330023, SDR CA980330021. AIRCRAFT TT: 8,362 HOURS.