What was found
TAKEOFF WAS ABORTED AT 160 KNOTS DUE TO NR 2 ENGINE FAILURE. N1 WENT FROM 104 PERCENT TO 34 PERCENT. INITIAL EXAMINATION OF THE NR 2 ENGINE REVEALED METAL IN THE TAILPIPE. THERE WAS NO EVIDENCE OF INGESTION OR BLADE DAMAGE ON THE INLET AREA AND THE ENGINE CASE AND COWL WERE NOT DAMAGED. THE NR 2 ENGINE WAS REMOVED AND REPLACED. [07-25-07] A BOROSCOPE OF THE ENGINE FOUND THE FAN MID SHAFT(FMS) SEPARATED IN THE AXIAL ZONE IN LINE WITH THE HPC STAGE 3 DISK. INVESTIGATION BY ENGINEERING AND GE CONCLUDED THAT AN OMNI SEAL WAS NOT INSTALLED DURING ENGINE BUILDUP AND THAT THIS CAUSED ACCELERATED CORROSION OF THE FMS AND SUBSEQUENT FAILURE.