What was found
PILOTS REPORT: WTH BOTH ENGINES AT GROUND IDLE AND ENGINE INDICATION NORMAL, ADVANCED THE POWER LEVERS SLIGHTLY PAST THE GROUND IDLE POSITION WHEN A LOUD GRINDING NOISE WAS HEARD WITH RAPID N1 ACCELERATION, RISING TURBINE OUTLET TEMPERATURE AND DECREASING N2 ON THE NR 2 ENGINE. EMERGENCY ENGINE SHUTDOWN PROCEDURES WERE PERFORMED AND THE MEDICAL CREW EXITED THE AIRCRAFT. SMOKE AND SPARKS WERE WITNESSED COMING FROM THE NR 2 ENGINE EXHAUST BY THE MEDICAL CREW. MECHANIC WAS NOTIFIED AND ASSESSED INTERNAL BEARING FAILURE.