ACR LTT RETURN LAND AFTER INFLT ENG SHUTDOWN AND EMER DECLARED.

Narrative

DURING CLB TO CRUISE ALT FOLLOWING DEP FROM MOBILE; AL; WE EXPERIENCED 3 'LOUD BANGS' FOLLOWED BY THE PAX CABIN AND COCKPIT RECEIVING SMOKE FROM THE PRESSURIZATION SYS. I WAS FLYING THE ACFT AND INSTINCTIVELY REDUCED PWR AND LOWERED THE NOSE. THE PIC WAS THE PNF AND OBSERVED THE TORQUE DROP AND THEN COME BACK ON THE L ENG. WE MADE POSITIVE THAT IT WAS THE L ENG AND THEN CONDUCTED A PRECAUTIONARY SHUTDOWN USING THE QRH (EMER CHKLIST). APCH CTL WAS ADVISED OF THE LOSS OF THE ENG; WE DECLARED AN EMER AND SET UP FOR A SINGLE ENG ILS APCH BACK INTO MOBILE. ONCE THE ENG WAS STOWED THE SMOKE WAS VACATED BY THE PRESSURIZATION SYS AND AN UNEVENTFUL SINGLE ENG APCH AND LNDG WAS CONDUCTED. INITIAL INSPECTION BY MAINT INDICATES THAT THE COMPRESSOR STALLS WERE CAUSED BY A BEARING FAILURE. IN REVIEWING THE INCIDENT AND CRITIQUING IT AMONG OURSELVES; WE DID EVERYTHING WE WERE SUPPOSED TO DO BUT; IF ANYTHING; WE DID IT TOO FAST. I THINK THE URGENCY OF THE SIT WAS COMPOUNDED BY THE SMOKE IN THE COCKPIT. ANOTHER POINT THAT I THINK IS WORTH MENTIONING; THROUGHOUT THE EVOLUTION I; AS THE PF; CONTINUED TO FLY THE ACFT WHILE THE PIC WENT BACK AND REVIEWED THE CHKLIST AND MAINTAINED COM WITH ATC.