WHILE TRAVELING AS A NON REVENUE PAX ON A BA31; A FLT ATTENDANT NOTICED THAN AN ENG WAS ON FIRE; YELLED 'ENG FIRE;' AND THEN EVACED THE ACFT WITHOUT ANY ACKNOWLEDGEMENT FROM THE COCKPIT. AFTER EXITING THE ACFT WITH THE PAX; THE FLT ATTENDANT SAW A BURNED OBJECT LYING ON THE TXWY BEHIND THE ACFT. THE RPTR (FLT ATTENDANT) QUESTIONS FLC PROCS REGARDING PAX EVAC.

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I WAS TRAVELING HOME TO DETROIT. I TOOK A MAJOR AIRLINE FROM DCA TO DAY AND THEN I WAS SCHEDULED TO TAKE A COMMUTER FLT DEPARTING FROM DAY TO DETROIT. I BOARDED THE ACFT; AND WAS SITTING AT XX; A WINDOW EXIT ON ACFT R. I PICKED UP THE EMER CARD; AND REMEMBER READING THAT THE ACFT WAS A JETSTREAM 31. THE COCKPIT MADE THE EMER ANNOUNCEMENTS; BECAUSE NO FLT ATTENDANT WAS ON BOARD. WE WERE AT THE END OF THE RWY AND READY FOR TKOF WHEN I HEARD 4 LOUD BEEP-BEEP SIGNALS FROM THE COCKPIT. I BECAME ALERT; BECAUSE IT SOUNDED LIKE AN INSTRUMENTATION WARNING SIGNAL. THE ACFT WAS MOVING; AND THEN THERE WAS A LOUD BANG; AND I LOOKED IN THE DIRECTION OF THE SOUND; AND SAW SMOKE COMING FROM THE L ENG; AND THEN FIRE. UPON SEEING THE FIRE; I PULLED THE R WINDOW EXIT; CALLED OUT 'ENG FIRE' TO THE COCKPIT; BECAUSE THE ENGS WERE STILL RUNNING AND I DID NOT KNOW IF THE COCKPIT KNEW THAT THE L ENG WAS ON FIRE. (THERE WAS ONLY A DRAPE SEPARATING THE COCKPIT FROM THE CABIN; AND THIS DRAPE WAS OPEN; SO I WAS SURE THAT THE COCKPIT COULD HEAR ME.) THE COCKPIT DID NOT DO OR SAY ANYTHING TO INITIATE AN EVAC. I COULD STILL SEE FIRE ON THE L ENG; SO I WENT OUT ON THE WING OF THE ACFT -- BECAUSE THERE WAS NOT ENOUGH ROOM INSIDE THE CABIN FOR ME TO ASSIST INSIDE AT THE WINDOW -- AND I CALLED TO THE PAX TO COME OUT THE WINDOW ONTO THE WING WHERE I SQUATTED WITH MY ARM EXTENDED TO HELP THEM THROUGH THE WINDOW. I HELPED THE FIRST 2 PAX TO GET OFF THE WING ONTO THE GND - - I DID NOT SEE ANY SLIDE OR LADDER FOR ASSISTANCE -- AND I INSTRUCTED THESE 2 PAX TO STAY BY THE WING TO HELP THE OTHER PAX GET DOWN. WHEN I THOUGHT ALL OF THE PAX WERE OUT; I CALLED OUT TO THE COCKPIT; WHO WERE INSIDE THE CABIN; 'ARE ALL THE PAX OUT?' THEY RESPONDED; 'YES.' ON THE GND THE COCKPIT ASKED IF EVERYONE WAS ALRIGHT; AND I RESPONDED; YES. THEN THE COCKPIT INSTRUCTED THE PAX TO MOVE AWAY FROM THE ACFT; AND STAY TOGETHER. I ALSO SAW THAT THIS WAS DONE. THE FIRE TRUCKS CAME; THE POLICE; AND AMBULANCE; BUT THANKFULLY; TO MY KNOWLEDGE; NO ONE WAS HURT. I OBSERVED THAT A BURNED OBJECT WAS LYING SOME DISTANCE (APPROX 12 FT) BEHIND THE ACFT WHERE WE HAD TAXIED OUT. A BUS TOOK US TO THE TERMINAL. NO ONE FROM THE COMMUTER AIRLINE QUESTIONED ME OR ASKED ME; OR ANY OF THE OTHER PAX; ANYTHING. THE PAX LATER TOLD ME THAT THEY SAW THE FIRE; AND THEY KNEW THEY HAD TO DO SOMETHING; BUT THAT THEY FROZE. THEY SAID THAT THEY DID NOT KNOW I WAS A FLT ATTENDANT; BECAUSE I WAS TRAVELING IN A BUSINESS SUIT; BUT THEY FOLLOWED MY INSTRUCTIONS; BECAUSE I APPEARED CONFIDENT; AND THEY KNEW THEY HAD TO GET OUT OF THE ACFT. I AM CONCERNED THAT THERE ARE NO FLT ATTENDANTS ON BOARD THIS ACFT; AND THAT THE COCKPIT DID NOT GIVE ANY INSTRUCTIONS TO THE PAX FOR EVAC. WHAT ARE THE PROPER EMER PROCS FOR THIS ACFT? THANKING YOU IN ADVANCE FOR YOUR RESPONSE.