What was found
REPORTED CAUSE FOR REMOVAL OF ENGINE FROM AIRCRAFT WAS TURBINE BLADE FAILURE. INVESTIGATION FINDINGS: ENGINE DISASSEMBLED AS NECESSARY AND REPAIRED DUE TO TURBINE BLADE FAILURE. DISCREPANCY NOTED DURING INSPECTION WAS PLATING PEELING OFF 23 EACH, PN 569551, FIRST STAGE TURBINE VANES WITH A TOTAL TIME OF 396.6 HRS, AND 10 EACH REWORKED (OVERHAULED) PN 569551 VANES WITH 396.6 HRS TSO (REF P & WA PN 435108 OVERHAUL MANUAL, PAGES 6-92, PARA 6-229). SUBJECT VANES WERE REPLACED.