INFLT ENG SHUTDOWN MANDATES A RETURN AND LAND AT DEP ARPT. PROBLEM COMPOUNDED BY TSTM ACTIVITY AND ARPT WX MINS FOR LNDG.

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DUE TO DEPART CVG FOR IND. AT XX57 (SCHEDULED PUSHBACK TIME). WX RAPIDLY CHANGING DUE TO COLD FRONT. PUSHED BACK ON TIME BUT DID NOT POS AND HOLD UNTIL XY25 DUE TO WX DELAYS AND CHANGING RWYS. POS AND HOLD AT XY25. LOOKED AT RADAR AND SAW NUMEROUS CELLS TO SW WITH ONE SLIGHTLY TO NW (APPROX 7-10 MI OFF RWY). CAPT AND I DISCUSSED WX AND TOLD TWR WE WOULD NEED A 340 DEG HDG AFTER TKOF. GIVEN TKOF CLRNC; AT APPROX XY32 WITH TURN TO 340 DEGS; MY LEG. TKOF ROLL AND LIFTOFF WERE NORMAL. AS SOON AS THE GEAR WAS UP; I STARTED A R TURN. AT APPROX 1500 FT MSL THE R FIRE LIGHT AND BELL SOUNDED. AS I LOOKED AT THE GLOWING FIRE HANDLE; THE CAPT REACHED UP WITHOUT SAYING ANYTHING TO ME AND PULLED THE R FIRE HANDLE; SHUTTING DOWN THE R ENG. I LOWERED THE NOSE AND COULD NOT BELIEVE THAT #2 ENG WAS WINDING DOWN. AIRSPD WAS APPROX 160 KTS. THE R HAND FIRE LIGHT WENT OUT AS THE CAPT SAID; 'AH ----; I SCREWED UP!' I LEVELED AT 2000 FT AND CLEANED THE ACFT UP AND THE CAPT CONTACTED DEP. CAPT INITIATED ENG FIRE CHKLIST AND TOLD DEP WE HAD SHUT DOWN THE ENG AND WANTED TO RETURN TO CVG. HE SAID THE FIRE TEST WAS GOOD BUT CALLED THE FLT ATTENDANTS TO HAVE THEM VISUALLY CHK FOR FIRE INDICATIONS JUST TO BE SURE. THE FLT ATTENDANTS RPTED ALL LOOKED NORMAL SO WE DID NOT SHOOT THE FIRE BOTTLES. AT THIS POINT WE SET UP FUEL XFEED DUE TO AN IMBAL OF APPROX 1000 POUNDS; WE WERE VECTORED BACK FOR THE ILS TO 36R; CAPT DID DSCNT AND APCH CHKLISTS. JUST OUTSIDE THE OM TWR RPTED DECREASING RVR'S DUE TO RAIN SHOWERS. TWR RPTED TOUCHDOWN RVR WAS 1600 FT AND THAT AN LGT HAD BROKEN OUT 100 FT ABOVE MINS. I WAS CONCERNED WITH VISIBILITY AND XWIND (APPROX 15 KTS) AND TOLD CAPT I WANTED TO GO MISSED APCH. I INITIATED GAR AND WE REQUESTED VECTORS BACK FOR ANOTHER TRY. 2ND APCH WAS NORMAL BUT AIRSPD FAST INSIDE LOM; BROKE OUT ABOUT 700 FT AGL AND HAD TO PULL THROTTLES TO IDLE ON SHORT FINAL. TOUCHDOWN WAS SLIGHTLY L OF CTRLINE; TURNED OFF RWY AND CAPT REQUESTED EMER EQUIP TAKE A LOOK (ALL LOOKED NORMAL). CAPT TALKED TO PAX. MAINT FOUND RUPTURED BLEED AIR DUCT TO ANTI-ICE VALVE AND REPAIRED SAME. CONCLUSION: WE ARE TAUGHT THROUGHOUT OUR TRAINING TO NOT JUMP ON THE FIRST INDICATION OF A PROBLEM. IN THE NAVY WE CALLED IT 'BEING SPRING-LOADED TO THE SCREWED-UP POS....' I ALWAYS THOUGHT THAT I WOULD BE ABLE TO STOP ANOTHER CREW MEMBER FROM DOING SOMETHING THAT IMPULSIVE -- I WAS WRONG! WE WERE CONCERNED WITH THE WX; THE LIGHT WENT OFF AND THE CAPT PULLED THE HANDLE. WE HAD NO CLUE AS TO WHAT THE PROBLEM REALLY WAS BUT SUDDENLY WE WERE SINGLE ENG AND DODGING TSTMS. THE CAPT LATER SAID HE COULDN'T BELIEVE WHAT HE HAD DONE. I COULDN'T EITHER! THE LESSON IS THE SAME: THE NEXT TIME THE BELL/HORN/LIGHT/ETC COMES ON YOU BETTER: SIT ON YOUR HANDS; COUNT TO TEN; START YOUR CLOCK; OR SOMETHING BESIDES MAKE A BAD SITUATION WORSE.