Narrative:

Primary and secondary target lost on a 4-5 mi final and reacquired on a 3 mi final. Known blind spot. Callback conversation with facility specialist revealed the following information: advised that radar data is lost with traffic on final, below 1300 ft, between 1-4 mi final runway 9L, west of tmb. Partial, but inconsistent radar tracking, is lost with traffic on runway 9R extending 4 mi west of airport. There is no apparent radar tracking problem if traffic is more than 2 mi north of runway 9R, or 2 mi south of the runway 9L finals. Tmb is slaved from the mia approach radar system, approximately 12 mi northeast of tmb. A sample radar data track was taken in nov/01 and sent to the FAA technical center. The specialist is not aware of any results.

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Original NASA ASRS Text

Title: TMB CTLR RPTS LOSS OF PRIMARY AND SECONDARY RADAR TRACKING WITH TFC 4 MI W OF ARPT.

Narrative: PRIMARY AND SECONDARY TARGET LOST ON A 4-5 MI FINAL AND REACQUIRED ON A 3 MI FINAL. KNOWN BLIND SPOT. CALLBACK CONVERSATION WITH FACILITY SPECIALIST REVEALED THE FOLLOWING INFO: ADVISED THAT RADAR DATA IS LOST WITH TFC ON FINAL, BELOW 1300 FT, BTWN 1-4 MI FINAL RWY 9L, W OF TMB. PARTIAL, BUT INCONSISTENT RADAR TRACKING, IS LOST WITH TFC ON RWY 9R EXTENDING 4 MI W OF ARPT. THERE IS NO APPARENT RADAR TRACKING PROB IF TFC IS MORE THAN 2 MI N OF RWY 9R, OR 2 MI S OF THE RWY 9L FINALS. TMB IS SLAVED FROM THE MIA APCH RADAR SYS, APPROX 12 MI NE OF TMB. A SAMPLE RADAR DATA TRACK WAS TAKEN IN NOV/01 AND SENT TO THE FAA TECHNICAL CTR. THE SPECIALIST IS NOT AWARE OF ANY RESULTS.

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.