Light transport commuter has engine surge on approach. Engine shut down.

Attributes
ACN	247237
Time
Date	199307
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lan
State Reference	MI
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lan
Operator	common carrier : air carrier
Make Model Name	Light Transport, High Wing, 2 Turboprop Eng
Flight Phase	descent : approach descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 170 flight time total : 2600 flight time type : 170
ASRS Report	247237
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Scheduled air carrier passenger flight from fnt to lan with continuing service to ord. Numerous thunderstorms and rainshowers in the area, flew through quite a bit of heavy rain en route lan. On letdown to lan, established on the localizer (ILS 10R), just getting ready to intercept the GS, the left engine began surging. Torque fluctuating from approximately 500 pounds to 3000 pounds. Reduction of power lever and propeller would not help problem. Engine surging continuously. Left engine shutdown in-flight. Declared missed approach. Emergency checklists and normal checklists complied with. Due to inclement WX in lan and approach WX into lan, diverted to fnt (also company maintenance base). Uneventful southeast approach and landing into fnt. Suspected fuel control unit failure on left engine. Actions of crew including flight attendant were excellent. Due to CRM, 1 person flying the aircraft, the other handling checklists, radio, etc. This situation was fairly easy to deal with. CRM does work with a crew that works together.

Original NASA ASRS Text

Title: LTT COMMUTER HAS ENG SURGE ON APCH. ENG SHUT DOWN.

Narrative: SCHEDULED ACR PAX FLT FROM FNT TO LAN WITH CONTINUING SVC TO ORD. NUMEROUS TSTMS AND RAINSHOWERS IN THE AREA, FLEW THROUGH QUITE A BIT OF HVY RAIN ENRTE LAN. ON LETDOWN TO LAN, ESTABLISHED ON THE LOC (ILS 10R), JUST GETTING READY TO INTERCEPT THE GS, THE L ENG BEGAN SURGING. TORQUE FLUCTUATING FROM APPROX 500 LBS TO 3000 LBS. REDUCTION OF PWR LEVER AND PROP WOULD NOT HELP PROB. ENG SURGING CONTINUOUSLY. L ENG SHUTDOWN INFLT. DECLARED MISSED APCH. EMER CHKLISTS AND NORMAL CHKLISTS COMPLIED WITH. DUE TO INCLEMENT WX IN LAN AND APCH WX INTO LAN, DIVERTED TO FNT (ALSO COMPANY MAINT BASE). UNEVENTFUL SE APCH AND LNDG INTO FNT. SUSPECTED FUEL CTL UNIT FAILURE ON L ENG. ACTIONS OF CREW INCLUDING FLT ATTENDANT WERE EXCELLENT. DUE TO CRM, 1 PERSON FLYING THE ACFT, THE OTHER HANDLING CHKLISTS, RADIO, ETC. THIS SIT WAS FAIRLY EASY TO DEAL WITH. CRM DOES WORK WITH A CREW THAT WORKS TOGETHER.

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.