Narrative:

Prior to approach at runway 23 in buf; I discussed with my first officer that many times I have received a false GS on the ILS runway 23. He said he was aware of the problem. The WX was foggy and the RVR was going up and down between 1800 ft and 2000 ft. We were vectored for the approach and given 2300 ft and a heading to intercept the localizer; cleared for the approach. It was kind of a late turn for the localizer; but the approach was armed and captured the localizer and GS almost at the same time. Immediately the GS started moving up and the aircraft began a climb. My first officer disconnected the autoplt and made the corrections to descend back down to 2300 ft. We were still outside the OM and decided we would try to get re-established on a stabilized approach. If we could not; prior to the OM; we could go missed. We got back to our assigned altitude and we were able to make a stabilized approach to landing. I informed the approach controller of our deviation and the reason. I also talked to the tower controller about the problem. I called the supervisor and she told me that there is a NOTAM about the GS. She faxed it to me. It has been like this for yrs! I have had this problem many times. This GS needs to be fixed! Or maybe they should not use a right downwind; since it only happens on the right downwind for runway 23.

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Original NASA ASRS Text

Title: CARJ FLT CREW LNDG BUF EXPERIENCED ERRATIC GS RECEPTION DURING INTERCEPT FOR ILS RWY 23.

Narrative: PRIOR TO APCH AT RWY 23 IN BUF; I DISCUSSED WITH MY FO THAT MANY TIMES I HAVE RECEIVED A FALSE GS ON THE ILS RWY 23. HE SAID HE WAS AWARE OF THE PROB. THE WX WAS FOGGY AND THE RVR WAS GOING UP AND DOWN BTWN 1800 FT AND 2000 FT. WE WERE VECTORED FOR THE APCH AND GIVEN 2300 FT AND A HDG TO INTERCEPT THE LOC; CLRED FOR THE APCH. IT WAS KIND OF A LATE TURN FOR THE LOC; BUT THE APCH WAS ARMED AND CAPTURED THE LOC AND GS ALMOST AT THE SAME TIME. IMMEDIATELY THE GS STARTED MOVING UP AND THE ACFT BEGAN A CLB. MY FO DISCONNECTED THE AUTOPLT AND MADE THE CORRECTIONS TO DSND BACK DOWN TO 2300 FT. WE WERE STILL OUTSIDE THE OM AND DECIDED WE WOULD TRY TO GET RE-ESTABLISHED ON A STABILIZED APCH. IF WE COULD NOT; PRIOR TO THE OM; WE COULD GO MISSED. WE GOT BACK TO OUR ASSIGNED ALT AND WE WERE ABLE TO MAKE A STABILIZED APCH TO LNDG. I INFORMED THE APCH CTLR OF OUR DEV AND THE REASON. I ALSO TALKED TO THE TWR CTLR ABOUT THE PROB. I CALLED THE SUPVR AND SHE TOLD ME THAT THERE IS A NOTAM ABOUT THE GS. SHE FAXED IT TO ME. IT HAS BEEN LIKE THIS FOR YRS! I HAVE HAD THIS PROB MANY TIMES. THIS GS NEEDS TO BE FIXED! OR MAYBE THEY SHOULD NOT USE A R DOWNWIND; SINCE IT ONLY HAPPENS ON THE R DOWNWIND FOR RWY 23.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.