As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING A 100 HOUR INSPECTION A 1 INCH CRACK AND WARPAGE OF WING RIB P/N 78500-003 AT WING STATION 69.24 RIGHT. A NEW RIB WAS INSTALLED P/N 78500-003 PER AC 43. 13-1B AND A 337 COMPLETED. PIPERS NEW RIB P/N 78500-003 CONTAINS REINFORCEMENT WHICH SHOULD PREVENT SIMILAR CRACKS FROM FORMING IN THE FUTURE. (M)