A BEECH 1900D IN DESCENT AT 12000 FT DECLARED AN EMER AND SHUT DOWN THE R ENGINE DUE TO FIRE HANDLE LIGHT ILLUMINATED. ON GND DURING ENGINE START THE LIGHT ILLUMINATED AGAIN. CAUSED BY A FAILED FIRE HANDLE LIGHT ASSEMBLY.

Narrative

WE STARTED TO DESCEND INTO ZZZ AREA AND THE R FIRE T-HANDLE ILLUMINATED. THE FO AND I AGREED TO SECURE THE R ENGINE. WE PROCEEDED WITH OUR MEMORY ITEMS. WE THEN INFORMED ATC AND THEN RAN THE QRH PROCEDURE. I HAD ATC GET THE TRUCKS READY IN ZZZ. THE HANDLE THEN EXTINGUISHED. THE FIRE DEPT AND I COORDINATED FOR US TO STOP ON THE RWY AND THE FIRE DEPT WOULD INSPECT THE ENGINE. THE FIREFIGHTER GAVE US THE OK AND WE TAXIIED TO THE TERMINAL. WE DEPLANED THE ACFT AND CALLED MAINT TO INFORM THEM OF THE SIT. PRIOR TO LEAVING ZZZ1 THE T-HANDLE CAME ON FOR A BRIEF SECOND WHILE STARTING THE R ENGINE. I TOLD THE FO THAT IF IT CAME ON AGAIN I WOULD SHUT DOWN AND HAVE HIM INSPECT IT. AS WE TAXIIED OUT TO THE ACTIVE RWY I CALLED MAINT AND THEY INSTRUCTED US TO CONTINUE BUT TO MONITOR THE SIT. I BRIEFED THE FO THAT IF WE GET ANY INDICATION OF A FIRE WE WOULD TREAT IT ACCORDINGLY AND SHUT THE ENGINE DOWN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE R ENGINE FIRE SHUTOFF HANDLE ILLUMINATING WAS THE FAILURE OF THE FIRE WARNING LOOP AMPLIFIER LOCATED IN THE FIRE HANDLE. THE RPTR SAID BOTH TIMES THE LIGHT ILLUMINATED NO AURAL FIRE WARNING BELL WAS ACTIVATED. THE RPTR STATED THIS LACK OF A FIRE WARNING BELL; AND WITH ONLY THE FIRE SHUTOFF HANDLE ILLUMINATED; IT WAS BELIEVED THE HANDLE WAS AT FAULT. THE RPTR SAID THE FIRE LOOP AMPLIFIER LOCATED IN THE FIRE HANDLE WAS FOUND TO BE MALFUNCTIONING.