A SAAB 340 ON TKOF IN RAIN AT 100 FT DECLARED AN EMER DUE TO A HOT TAILPIPE WARNING LIGHT. LIGHT WENT OUT AND EMER CANCELLED.

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WE GOT A TAIL PIPE HOT WARNING LIGHT ON TKOF AFTER ROTATION APPROX 100 FT. WE COMPLETED THE MEMORY ITEMS THEN DECLARED AN EMER. WE WERE ON RADAR VECTORS TO RETURN TO ZZZ WHEN THE LIGHT WENT OUT. WE COMPLETED THE CHKLIST AND GOT A PHONE PATCH WITH MAINT. THEY SAID THE LIGHT WAS CAUSED BY WATER GETTING UP INTO THE TAILPIPE WHILE WE WERE WAITING TO TKOF. BOTH THE CAPT AND MAINT FELT IT WAS SAFE TO CONTINUE THE FLT. WHILE I AGREED THAT IT WAS SAFE TO CONTINUE; I FELT THAT WE DECLARED AN EMER AND SHOULD RETURN BACK TO ZZZ I TOLD MY CAPT THIS SEVERAL TIMES WITHIN THE NEXT FEW MINS. HE ASSURED ME THAT THIS WAS COMMON IN THE SAAB TO GET THAT KIND OF WARNING AND THE FLT WAS SAFE TO CONTINUE. THE FLT CONTINUED WITH NO FURTHER PROBS. I STILL FEEL WE SHOULD HAVE RETURNED TO ZZZ. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ENG TAILPIPE ACCUMULATES WATER IN RAIN OR MISTY CONDITIONS WHEN LAYING OVERNIGHT OR WHEN HOLDING FOR TKOF. THE RPTR SAID WHEN POWER IS APPLIED THE WATER FLASHES TO STEAM TRIGGERING THE HOT TAILPIPE SENSOR. THE RPTR STATED AFTER THE EMER WAS DECLARED AND RADAR VECTORS WERE GIVEN FOR THE RETURN THE LIGHT WENT OUT. THE RPTR SAID THE CAPT WAS CERTAIN THE PROB WAS A FALSE WARNING AND WAS A COMMON RPT ON THIS AIRPLANE.