What was found
(CAN) SHORTLY AFTER LANDING BEECH KING AIR MODEL B300 WHILE TAXING HAD THE LEFT HAND STARTER GENERATOR GO OFF LINE. GENERATOR WAS RESET ONCE AND WENT OFF LINE AGAIN. AIRCRAFT RETURNED TO HANGER.UPON INSPECTION OF THE STARTER GENERATOR IT WAS APPARENT THE AFT BEARING HAD FAILED. ARMATURE SHAFT COULD BE MOVE UP AND DOWN IN THE SUPPORT HOUSING. PIECES OF THE BEARING FELL OUT WHEN THE COMPONENT WAS REMOVED FROM THE A/C. AS A RESULT OF BEARING FAILURE COOLING FAN CAME INTO CONTACT WITH THE AIR INLET HOUSING CAUSING DAMAGE TO BOTH.