ATX WX RPTING EQUIP FALSE MICROBURST WARNING.

Narrative

MICROBURST ALERT FOR 55 KT LOSS ON FINAL OFF THE RIBBON DISPLAY TDWR EQUIP. NO SHEAR OR MICROBURST PRESENT. SUPPLEMENTAL INFO FROM ACN 294049: JUST A LITTLE BACKGND: N BOUNDARY SENSOR FOR THE WINDS HAS BEEN OTS FOR 12 MONTHS. ON JAN/XX/95 WE HAD A WIND SHEAR ALERT THAT DIDN'T MAKE ANY SENSE. RWY 18L LSA 30K - 99999; RWY 18R LSA 30K - 99999; CTR FIELD WINDS CALM. I BROUGHT THIS TO THE SUPVR'S ATTN AND IN TURN HE ADVISED MAINT. THIS WAS LOGGED. 4 DAYS LATER IT WAS REMOVED FROM THE LOG WITHOUT BEING FIXED. I AM AWARE OF AT LEAST 7 DIFFERENT OCCASIONS WHEN THIS OCCURRED. THE ACTUAL DISPLAY (CRT) SHOWED NOTHING AT ALL. I DON'T NOW WHY MAINT RETURNED THIS TO SVC. TODAY WE WERE IFR AND WE HAD A MICROBURST ALERT ON RWY 18L THAT READ: RWY 18L MBA 55K - 99999; RWY 18R 55K - 99999; CF 080 07. ACFT WENT INTO HOLDING FOR ABOUT 5 MINS. FINALLY A SF340 MADE AN APCH AND RPTED JUST A LITTLE BUMPY RIDE. THE SUPVR THEN TURNED THE RIBBON DISPLAY OFF. MAINT WAS NOTIFIED. AS OF PM35Z JAN/YY/95 NO LOG RPTS WERE MADE. I BROUGHT THIS TO THE SUPVR'S ATTN AND IT WAS LOGGED. THE PROB MIGHT BE THE TDWR SYS ITSELF.