Air carrier light transport return land after in-flight engine shutdown and emergency declared.

Attributes
ACN	231998
Time
Date	199301
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mob
State Reference	AL
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude other other
Route In Use	enroute airway : mob
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	231998
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

During climb to cruise altitude following departure from mobile, al, we experienced 3 'loud bangs' followed by the passenger cabin and cockpit receiving smoke from the pressurization system. I was flying the aircraft and instinctively reduced power and lowered the nose. The PIC was the PNF and observed the torque drop and then come back on the left engine. We made positive that it was the left engine and then conducted a precautionary shutdown using the QRH (emergency checklist). Approach control was advised of the loss of the engine, we declared an emergency and set up for a single engine ILS approach back into mobile. Once the engine was stowed the smoke was vacated by the pressurization system and an uneventful single engine approach and landing was conducted. Initial inspection by maintenance 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 situation 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 aircraft while the PIC went back and reviewed the checklist and maintained communication with ATC.

Original NASA ASRS Text

Title: 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.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.