Narrative:

3 different aircraft; 3 different days; flew a practice CAT III approach to tpa runway 36L. All 3 required changing the CDI from 004 degrees to 006 degrees to get the runway symbology to line up with the runway. 002 degrees may not sound like much; but this 'is' a significant change. I very much would not like to be at 50 ft AGL during a real CAT III approach trying to find the runway and have to deal with the runway not being where the symbology says it is supposed to be and having to; at 50 ft AGL and descending; try to find the real runway. 3 different aircraft; so this was not an aircraft specific problem. There is obviously some error in the ground based equipment for the tpa runway 36L CAT III ILS. HUD runway symbology incorrect. Callback conversation with reporter revealed the following information: the reporter stated that he observed this same behavior at sea several years ago but the ILS error was corrected and the alignment appears correct there now. The behavior at tpa is very similar to the sea ILS alignment behavior and degrades his confidence just a bit because he is not sure what he will see when flying an actual hand flown CAT IIIA to 50 ft.

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Original NASA ASRS Text

Title: AN ACR PILOT REPORTS THE HUD SYMBOLOGY ON THE TPA 36L CATIII IS OFF 2 DEGS AND THE RWY DOES NOT LINE UP WITH HUD APCH TRACK.

Narrative: 3 DIFFERENT ACFT; 3 DIFFERENT DAYS; FLEW A PRACTICE CAT III APCH TO TPA RWY 36L. ALL 3 REQUIRED CHANGING THE CDI FROM 004 DEGS TO 006 DEGS TO GET THE RWY SYMBOLOGY TO LINE UP WITH THE RWY. 002 DEGS MAY NOT SOUND LIKE MUCH; BUT THIS 'IS' A SIGNIFICANT CHANGE. I VERY MUCH WOULD NOT LIKE TO BE AT 50 FT AGL DURING A REAL CAT III APCH TRYING TO FIND THE RWY AND HAVE TO DEAL WITH THE RWY NOT BEING WHERE THE SYMBOLOGY SAYS IT IS SUPPOSED TO BE AND HAVING TO; AT 50 FT AGL AND DSNDING; TRY TO FIND THE REAL RWY. 3 DIFFERENT ACFT; SO THIS WAS NOT AN ACFT SPECIFIC PROB. THERE IS OBVIOUSLY SOME ERROR IN THE GND BASED EQUIP FOR THE TPA RWY 36L CAT III ILS. HUD RWY SYMBOLOGY INCORRECT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER STATED THAT HE OBSERVED THIS SAME BEHAVIOR AT SEA SEVERAL YEARS AGO BUT THE ILS ERROR WAS CORRECTED AND THE ALIGNMENT APPEARS CORRECT THERE NOW. THE BEHAVIOR AT TPA IS VERY SIMILAR TO THE SEA ILS ALIGNMENT BEHAVIOR AND DEGRADES HIS CONFIDENCE JUST A BIT BECAUSE HE IS NOT SURE WHAT HE WILL SEE WHEN FLYING AN ACTUAL HAND FLOWN CAT IIIA TO 50 FT.

Data retrieved from NASA's ASRS site as of May 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.