Narrative:

Aircraft was tracking northwest to southeast 5 mi east of srq VOR level at 3500 ft. ARTS data block kept going to 6500 ft. ARTS went back and forth between 3500 and 6500 for about 20 mi of aircraft's flight. We had more ARTS problems than normal on this day with both the tpa ASR 8 and the sarasota digital system. We were too busy to log each occurrence.

Google
 

Original NASA ASRS Text

Title: VFR ACFT GOING THROUGH TPA AIRSPACE LEVEL AT 3500 FT AND RECEIVING TA'S HAS MODE C ALT JUMP.

Narrative: ACFT WAS TRACKING NW TO SE 5 MI E OF SRQ VOR LEVEL AT 3500 FT. ARTS DATA BLOCK KEPT GOING TO 6500 FT. ARTS WENT BACK AND FORTH BTWN 3500 AND 6500 FOR ABOUT 20 MI OF ACFT'S FLT. WE HAD MORE ARTS PROBS THAN NORMAL ON THIS DAY WITH BOTH THE TPA ASR 8 AND THE SARASOTA DIGITAL SYS. WE WERE TOO BUSY TO LOG EACH OCCURRENCE.

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.