CRJ200 FLT CREW REPORTS THRUST STUCK AT 82% N1 ON LEFT ENGINE DURING APPROACH. AFTER MISSED APPROACH; EMERGENCY IS DECLARED; ENGINE IS SHUT DOWN; AND SINGLE ENGINE LANDING ENSUES.

Narrative

ON FINAL AFTER WE WERE FULLY CONFIGURED FOR THE APCH; WE NOTICED THAT THE N1 ON THE L ENG REMAINED AT ABOUT 82% WITH THE THRUST LEVERS AT IDLE. AFTER A BRIEF DISCUSSION ABOUT THE ISSUE; WE INITIATED A MISSED APCH UP TO 4000 FT. THE CAPT INFORMED THE TWR OF THE MISSED APCH AND THE HIGH THRUST SETTING ON THE L ENG AND I CONTINUED TO FLY THE ACFT. AT ALT; I CONTINUED FLYING THE ACFT AND TOOK OVER THE RADIOS AS THE CAPT BEGAN LOOKING FOR A QRH PROC THAT BEST FIT OUR SITUATION. ON THE LEVELOFF WITH BOTH THRUST LEVERS AT IDLE; WE WERE UNABLE TO MAINTAIN 250 KTS; AND I INFORMED ATC OF OUR 280 KT AIRSPD. AFTER DECIDING THAT THE BEST COURSE OF ACTION FOR THE HIGH THRUST SETTING WAS TO PERFORM THE SINGLE ENG QRH PROC; WE OPTED TO CALL MAINT FIRST. AT THIS TIME; I DECLARED AN EMER; LET ATC KNOW THAT WE WOULD BE SHUTTING DOWN THE L ENG; AND THAT WE WOULD NEED ADDITIONAL VECTORS TO RUN THE CHKLISTS. THE CAPT TALKED TO THE FLT ATTENDANT; LET THE PAX KNOW WHAT WAS GOING ON; AND THEN TALKED TO MAINT. WE THEN RAN THE SINGLE ENG QRH WITH THE ADDITION OF PUSHING THE 'ENG FIRE PUSH' SWITCH BECAUSE MOVING THE L THRUST LEVER TO SHUTOFF HAD NO EFFECT ON THE N1 SETTING. WHEN THE QRH AND ALL THE OTHER CHKLISTS HAD BEEN PERFORMED; I CONTINUED TO FLY THE ACFT BACK FOR A SINGLE ENG LNDG AT ZZZ.