FLC OF S80 HAS LOC DEFLECTION DURING APCH INTO TUL. THEY TRIED CHKING TO DETERMINE IF IT IS THE ACFT EQUIP. THEY DETERMINED THAT THIS IS HAPPENING TO OTHER ACFT AS WELL. ON ANOTHER TRIP WITH A COUPLED APCH THE SAME PROB EXISTED.

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TUL TWR. LOCATION: ON LOC APCH TO RWY 18L TUL. FROM 2000 FT AGL TO 700 FT AGL RWY 18L LOC; LOC DEFLECTION NOTICED ON AUTOFLT SYS AND ON NAV INSTS. AFTER AUTOPLT WAS DISCONNECTED; LOC WAS STILL ERRATIC. THIS PROB WAS CONFIRMED BY ANOTHER AIRLINE FLT FOLLOWING ON SAME APCH. RWY 18L HAS BEEN UNDER CONSTRUCTION; WHICH MAY HAVE AFFECTED LOC SIGNAL INTEGRITY. SUGGEST FURTHER FOLLOW UP AND ANALYSIS BY APPROPRIATE AUTHS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE MADE ANOTHER TRIP INTO TUL AND HAD HOPED TO CHK THE LOC DEVS TO SEE IF THE CONDITIONS HAD CHANGED. IT WAS DIFFICULT BECAUSE THERE WAS SO MUCH WIND. THEY DID MAKE A COUPLED APCH ON RWY 18L ILS AND THERE WERE STILL DEVS. HE COULD SEE THE WORK GOING ON WITH THE APCH LIGHTS AND RPTR WONDERS IF THAT MAY BE CAUSING SOME OF THE PROBS. HE HAS LEARNED THAT THE EFFORTS ARE TO BRING RWY 18L UP TO A CAT II STATUS. THE COMPANY DOES KNOW ABOUT THE SIT BUT RPTR DOES NOT KNOW IF ANY ACTION HAS BEEN TAKEN. RPTR ALSO MENTIONED THE PROB TO THE TWR.