Narrative:

I was working local control and approach apreqed a VOR runway 2 approach. I knew that this approach had had an issue several days earlier that flight check had checked and deemed to be within tolerance. I was watching the aircraft on the approach and at approximately a five mile final; the aircraft veered west of course and was no longer on the approach. I knew the aircraft was below the clouds doing this approach as practice IFR. I informed the pilot that he was west of course and he advised that he was correcting. I knew that the approach had been flight tested the day before and deemed appropriate but I still wanted to pay extra close attention to the approach. This approach; VOR runway 2; into sgf has an issue. Aircraft veer west of course even though the approach should keep aircraft on the east side of the runway for the duration. This approach needs to be further investigated immediately! The approach has already locally been deemed unusable until further action is taken. I would recommend all controllers watch aircraft courses.

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Original NASA ASRS Text

Title: SGF Controller voiced concern regarding the accuracy of the VOR Runway 2 Approach Procedures; noting that even after a Flight Check aircraft appeared to veer West of the final approach course.

Narrative: I was working Local Control and Approach APREQed a VOR Runway 2 approach. I knew that this approach had had an issue several days earlier that Flight Check had checked and deemed to be within tolerance. I was watching the aircraft on the approach and at approximately a five mile final; the aircraft veered west of course and was no longer on the approach. I knew the aircraft was below the clouds doing this approach as practice IFR. I informed the pilot that he was west of course and he advised that he was correcting. I knew that the approach had been flight tested the day before and deemed appropriate but I still wanted to pay extra close attention to the approach. This approach; VOR Runway 2; into SGF has an issue. Aircraft veer west of course even though the approach should keep aircraft on the east side of the runway for the duration. This approach needs to be further investigated immediately! The approach has already locally been deemed unusable until further action is taken. I would recommend all controllers watch aircraft courses.

Data retrieved from NASA's ASRS site as of July 2013 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.