AN ATR42 WHILE PARKED DECLARED AN EMER DUE TO A #2 ENG FIRE CAUSED BY THE STARTER GENERATOR SYS.

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FLT XYZ HAD JUST PARKED AND SHUT DOWN AT SEA ARPT. PEOPLE HAD BEEN TAKEN INTO TERMINAL BY EMS WHICH IS OUR NORMAL ROUTINE. I EXITED ACFT TO GO INSIDE FOR PAPERWORK FOR NEXT FLT. MY FO REMAINED ON THE ACFT. I WAS INSIDE WHEN OPS TOLD ME MY ENG WAS ON FIRE. I WENT BACK OUTSIDE IMMEDIATELY AND SAW MY FO LOOKING AT #2. HE TOLD ME ABOUT 3 MINS AFTER WE SHUT DOWN; HE GOT A #2 FIRE WARNING. HE LOOKED OUTSIDE AND SAW SMOKE. HE PULLED #2 FIRE HANDLE; DISCHARGED #2 AGENT AND THE WARNING EXTINGUISHED. HE CALLED OPS AND TOLD THEM AND ASKED FOR FIRE TRUCKS. HE THEN GOT ALL GND PERSONNEL OFF ACFT. FIRE TRUCKS SHOWED UP BUT NO ACTION WAS NECESSARY. MAINT OPENED UP COWLINGS AND SAID THE STARTER/GENERATOR HAD FRIED AND STARTED FIRE AROUND EXISTING WIRING; ETC. DO NOT KNOW WHAT CAUSED THIS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS AN ATR42 AND MAINT DID NOT ADVISE THE RPTR OF THE PRECISE CAUSE OF THE STARTER/GENERATOR COMBINATION FAILURE. THE RPTR SAID THE STARTER AND GENERATOR OP WAS NORMAL ON THE INBOUND TRIP WITH NO INDICATION OF TROUBLE. THE RPTR STATED THE FAA HAS NOT BEEN IN CONTACT REGARDING THIS INCIDENT.