Narrative:

Approximately 1 yr ago, the minimum IFR altitudes were reworked at ZFW. Changes were made that lowered the overall mia's and small exceptions made for towers or higher mia areas. A tower exists at this location, which neither has a small higher exception nor where the existing mia is sufficient for clearance. Until this date, no ZFW controller knew of this tower. Management was notified of the error on feb/wed/00, but failed to make any changes until the memo was issued on feb/mon/00. The memo was merely placed in a binder where a verbal briefing would be needed. Monroe approach is the facility working this area. ZFW takes the airspace when mlu approach closes. The area is very close to the ILS runway 4 localizer. It is unknown how many aircraft under ZFW control have traversed this area at an improper altitude. ZFW management, when faced with this safety of flight issue, failed to take immediate action to issue a change to controller maps and pvd displays.

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Original NASA ASRS Text

Title: ZFW CTLR CONCERNED WITH NON DISPLAYED OBSTRUCTION IN VICINITY OF MLU ARPT.

Narrative: APPROX 1 YR AGO, THE MINIMUM IFR ALTS WERE REWORKED AT ZFW. CHANGES WERE MADE THAT LOWERED THE OVERALL MIA'S AND SMALL EXCEPTIONS MADE FOR TWRS OR HIGHER MIA AREAS. A TWR EXISTS AT THIS LOCATION, WHICH NEITHER HAS A SMALL HIGHER EXCEPTION NOR WHERE THE EXISTING MIA IS SUFFICIENT FOR CLRNC. UNTIL THIS DATE, NO ZFW CTLR KNEW OF THIS TWR. MGMNT WAS NOTIFIED OF THE ERROR ON FEB/WED/00, BUT FAILED TO MAKE ANY CHANGES UNTIL THE MEMO WAS ISSUED ON FEB/MON/00. THE MEMO WAS MERELY PLACED IN A BINDER WHERE A VERBAL BRIEFING WOULD BE NEEDED. MONROE APCH IS THE FACILITY WORKING THIS AREA. ZFW TAKES THE AIRSPACE WHEN MLU APCH CLOSES. THE AREA IS VERY CLOSE TO THE ILS RWY 4 LOC. IT IS UNKNOWN HOW MANY ACFT UNDER ZFW CTL HAVE TRAVERSED THIS AREA AT AN IMPROPER ALT. ZFW MGMNT, WHEN FACED WITH THIS SAFETY OF FLT ISSUE, FAILED TO TAKE IMMEDIATE ACTION TO ISSUE A CHANGE TO CTLR MAPS AND PVD DISPLAYS.

Data retrieved from NASA's ASRS site as of July 2007 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.