A BE1900D ON TAXI TO RWY HAD #2 ENG 'T' HANDLE FIRE WARNING ILLUMINATE. NO VISIBLE INDICATION OF FIRE. ACFT EVACUATED ON TXWY.

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WHILE TAXIING TO RWY 17 AT ZZZ; THE #2 ENG T-HANDLE ILLUMINATED. THE CAPT ASKED ME TO CONFIRM IF THE #2 ENG WAS ON FIRE. NO VISIBLE INDICATION OF A FIRE WAS PRESENT; AND I INFORMED CAPT OF SUCH. THE CAPT SHUT DOWN BOTH ENGS AND ORDERED EVAC. I RADIOED ZZZ GND CTL OF SITUATION AND REQUESTED EMER VEHICLES BE DISPATCHED. I EVACUATED THE PAX AND ESCORTED THEM TO A SAFE AREA. NO INJURIES WERE RPTED BY PAX OR CREW. I PERSONALLY BELIEVE THE EVAC WOULD HAVE BEEN FASTER AND MORE EFFICIENT IF I HAD BEEN GIVEN MORE COMPLETE TRAINING IN THIS ACTIVITY; INCLUDING MOCK EVAC REHEARSALS. THE ACTUAL EVAC; WHILE EFFECTIVE; COULD HAVE TAKEN ONE OR TWO MINS LESS WITH BETTER TRAINING. FORTUNATELY; NO ACTUAL FIRE WAS PRESENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FIRE WARNING WAS A FALSE WARNING. THE RPTR SAID THE BE1900D HAS A CHRONIC PROB WITH FALSE FIRE WARNINGS DURING A SHORT TURN ON THE GATE OF 15 MINS IN HOT WEATHER. THE RPTR STATED THE HEAT FROM THE ENG SOAKS THE FIRE LOOP AND ON TAXI IN HIGH AMBIENT TEMPERATURES A FALSE FIRE WARNING IS COMMON. THE RPTR SAID THE FLT CREW HAD A GREAT CONCERN ABOUT THE EVAC AND THE LACK OF FLT CREW TRAINING ON ACFT EVAC. THE RPTR STATED WHEN THE CAPT ORDERED THE EVAC; THE RPTR IMMEDIATELY LEFT THE COCKPIT AND OPENED THE L DOOR AND STOOD AT THE BOTTOM OF THE AIR STAIRS TO ASSIST PAX. THE RPTR SAID NO ONE MOVED AS ALL THE PAX SAT FROZEN IN THEIR SEATS AND IT TOOK THE CAPT'S YELLING TO GET THE PEOPLE MOVING OUT OF THE AIRPLANE.