What was found
DURING CLIMB AROUND 6000MSL , CREW OBSERVED SMOKE IN COCKPIT AND CABIN. UNSCHEDULED LANDING PERFORMED, EMERGENCY PROCEDURE CHECKLIST FOLLOWED, EMERGENCY DECLARED, AND LANDED WITHOUT INCIDENT. MAINTENANCE EVALUATION FOUND AIR CYCLE MACHINE (ACM) FRONT BEARING FAILURE - SEIZED. ACM REPLACED, P/N OFF 2206610-1 S/N OFF 1225