What was found
AFTER LANDING, SMOKE/OIL MIST FILLED THE CABIN. CREW SHUT DOWN AIRCRAFT AND EVACUATED THE PASSENGER ON THE TAXI WAY. ACM FAILURE. IMPELLER WAS FOUND LOOSE IN THE HOUSING. INITIALLY DEFERRED THE RIGHT BLEED SYSTEM IAW MEL. THE ACM WAS NOT SERVICED ON THE LAST INSPECTION, NOR WERE ANY DEFECTS NOTED DURING THE ROUTINE WING INSP IS A GENERAL VISUAL INSPECTION WITH NO DISASSEMBLY REQUIRED. REPLACED ACM, FOUND IMPELLER AND TURBINE END LOOSE IN THE SCROLL HOUSING.