What was found
DURING GROUND RUN, AFTER SCHEDULED TURBINE REPLACEMENT, LEAK CHECKS HAD BEEN COMPLETED AT IDLE POWER. WHILE ADDING POWER, AT ABOUT 85 PERCENT N2 THE NR 3 TURBINE WHEEL EXPERIENCED AN UNCONTAINED FAILUE DESTROYING THE ENGINE AS WELL AS DAMAGING THE COWLING, ROTOR BLADES, AND ENGINE PAN AND STRUCTURE. THE CAUSE IS UNDER INVESTIGATION BY MFG.