AN ATR42-300 ON A VISUAL APCH AT 1500 FT DECLARED AN EMER AND LANDED DUE TO FIRE WARNING FROM #2 ENG CAUSED BY AN UNSECURED COMPRESSOR BORESCOPE PLUG.

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DUE TO AN ENG FIRE INFLT WHICH RESULTED IN AN EMER LNDG THE CAPT WHO WAS THE PNF DECIDED HE WILL CONTINUE TO DO PNF DUTIES DURING THE REST OF THE FLT. EVEN THOUGH MEMORY ITEMS AND ENG FIRE INFLT CHKLIST WERE ACCOMPLISHED THE REST OF THE SINGLE ENG OP CHKLIST WAS ACCOMPLISHED SILENTLY AND CANNOT RECALL IF ANYTHING WAS SAID TO THAT RESPECT. HOWEVER ALL ITEMS WERE DONE EXCEPT ON THE PART OF BRIEFING THE APPROPRIATE VREF SPDS DURING OR PERTAINING TO THE SINGLE ENG PROFILE. CAPT RECALLS ADVISING PF (FO) ABOUT MAINTAINING A SPECIFIC AIRSPD PRIOR TO LNDG AND THAT IT WAS WELL ABOVE MINIMUM SPECIFIED ON CHKLIST. BUT NO MENTION ON ACCOMPLISHING CHKLIST VERBALLY. ALSO; AFTER LNDG AND SINCE FIRE WAS OUT BEFORE TOUCHDOWN CAPT REQUESTED FIRE CHIEF TO ADVISE ON WHETHER OR NOT TO TAXI TO THE RAMP; WHICH HE ACCEPTED AND A NORMAL DEPLANING OF PAX WAS DONE. NO ONE WAS INJURED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FIRST WARNING RECEIVED WAS AN ACRID ODOR FOLLOWED BY THE R ENG LOW OIL PRESSURE WARNING AND 3-5 SECONDS LATER THE ENG FIRE WARNING ALARM AND LIGHTS. THE RPTR SAID THE CAUSE WAS A COMPRESSOR CASE BORESCOPE PLUG NOT SECURED ALLOWING THE COMBINATION OF HOT BLEED AIR AND ENG OIL TO MIX. THE RPTR STATED THE ENG WAS REPLACED DUE TO FIRE DAMAGE.