A SAAB 340B ON TKOF ROLL AT V1 ROTATION REJECTED THE TKOF DUE TO AURAL AND VISUAL HOT TAILPIPE WARNING ON #1 ENG CAUSED BY FAILED HEAT SENSORS.

Narrative

AT THE SAME TIME THE NON-FLYING PLT SAID V1 VR; A (TAIL PIPE HOT) L ENG WARNING CAME VISUAL AND AUDIBLE FROM THE CENTRAL WARNING PANEL OF THE ACFT. AN ABORT OF THE TKOF WAS INITIATED; BUT THE ACFT LIFTED OFF THE RWY FOR APPROX 2 TO 3 SECS. AFTER LNDG; WE STOPPED THE ACFT ON THE REMAINING RWY; EXITED THE RWY ON NEXT TXWY. AFTER FOLLOWING OUR CHKLISTS AND DETERMINING THERE WAS A FALSE INDICATION WE SHUT DOWN THE ENG AS A PRECAUTION INFORMED THE TWR OF OUR PROB. BAD HEAT SENSORS ON THE ENG GAVE THE FALSE WARNING. EVERY TIME IT RAINS HEAVY THE SENSORS GET WET. I HAVE NOT SEEN A PERMANENT FIX TO THIS PROB YET. IN 4 YRS I HAD 3 OCCURRENCES OF THE SAME PROB. AT 2 DIFFERENT CARRIERS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AIRLINE WAS A SAAB 340B WITH 2 GENERAL ELECTRIC CT7-9B2 ENGS. THE RPTR SAID THIS ENG IS TROUBLED WITH CHRONIC FALSE HOT TAILPIPE WARNINGS CAUSED BY DEFECTIVE OR POORLY DESIGNED TAILPIPE SENSORS OR THERMOCOUPLES. THE RPTR STATED THE PROB EXISTS MAINLY WHEN THE WX IS RAINING OR MISTY. THE RPTR SAID SEVERAL CORRECTIVE ACTIONS AND IMPROVED PARTS HAVE BEEN INSTALLED; BUT THE PROB STILL PERSISTS.