SCHEDULED FREIGHTER EXPERIENCES AN ENG FIRE WARNING. INFLT ENG SHUTDOWN ACCOMPLISHED.

Narrative

AFTER ABOUT A ONE HR DELAY ON GND DUE TO TFC FLOW FOR TSTMS; DEPARTED DFW. ON VECTOR S FOR WX AVOIDANCE; PASSING ABOUT 12000 FT MSL; #3 ENG FIRE WARNING ACTIVATED. I WAS FLYING AND THE CAPT AND FE SHUTDOWN ENG IN ACCORDANCE WITH PROCS; INCLUDING USING BOTH FIRE EXTINGUISHING BOTTLES AVAILABLE TO R WING. CAPT ELECTED TO DIVERT TO HOUSTON INTERCONTINENTAL (IAH) FOR LNDG RATHER THAN FLY BACK THROUGH TSTM AREA IN VICINITY OF DFW. FIRE LIGHT EXTINGUISHED ABOUT 10 MIN AFTER ENG SHUTDOWN. CAPT ASSUMED CTL OF ACFT AND MADE UNEVENTFUL 3 ENG LNDG AT IAH. GND INSPECTION OF ENG BY MAINT PERSONNEL DID NOT DETERMINE CAUSE OF FIRE LIGHT BEFORE WE DEPARTED IAH IN A DIFFERENT ACFT; AND I HAVE NOT RECEIVED WORD YET AS TO CAUSE OF FIRE LIGHT. SUPPLEMENTAL INFO FROM ACN 270626: SOMEWHERE PRIOR TO 15000 FT; THE FIRE WARNING BELL SOUNDED; MASTER FIRE WARNING CAME ON AND THE LIGHT IN THE FIRE SHUTOFF HANDLE LIT FOR THE #3 ENG. I SILENCED THE BELL. WE BROUGHT THE #3 ENG THROTTLE BACK TO IDLE AND PAUSED FOR ABOUT 30 SECONDS TO SEE IF WE HAD A BLEED AIR LEAK. THE LIGHT STAYED ON SO WE SECURED #3 ENG IN ACCORDANCE WITH THE ENG SECURING CHKLIST.