|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||atc facility : clt.tower|
|Controlling Facilities||tower : clt.tower|
|Operator||common carrier : air carrier|
|Make Model Name||Any Unknown or Unlisted Aircraft Manufacturer|
|Operating Under FAR Part||Part 121|
|Flight Phase||climbout : takeoff|
|Affiliation||government : faa|
|Function||controller : local|
|Qualification||controller : non radar|
|Experience||controller radar : 23|
controller time certified in position1 : 13
|Anomaly||other anomaly other|
|Independent Detector||other controllera|
|Resolutory Action||none taken : anomaly accepted|
|Problem Areas||Navigational Facility|
|Primary Problem||Navigational Facility|
I was working local control east. I observed a target on the asde-X display that I confirmed was false as I looked out the window. I informed flm of the target. I cleared a jet for takeoff and as the aircraft rolled it set off the alarms on asde-X indicating a potential collision. This situation was logged. Exact same occurrences for each of the next 2 departures. Finally after I demanded the equipment be taken off line or I be relieved of the position the flm put the asde-X in limited mode. When the false target disappeared; the asde-X was put back in full operation. Problem was never diagnosed or fixed.
Original NASA ASRS Text
Title: CLT CTLR DESCRIBED INCIDENT WHEN NO TFC WAS OBSERVED ON THE DEP RWY BUT ASDE-X ALARMED ON FALSE TARGET WITH THREE DEP ACFT.
Narrative: I WAS WORKING LCL CTL E. I OBSERVED A TARGET ON THE ASDE-X DISPLAY THAT I CONFIRMED WAS FALSE AS I LOOKED OUT THE WINDOW. I INFORMED FLM OF THE TARGET. I CLRED A JET FOR TKOF AND AS THE ACFT ROLLED IT SET OFF THE ALARMS ON ASDE-X INDICATING A POTENTIAL COLLISION. THIS SITUATION WAS LOGGED. EXACT SAME OCCURRENCES FOR EACH OF THE NEXT 2 DEPS. FINALLY AFTER I DEMANDED THE EQUIP BE TAKEN OFF LINE OR I BE RELIEVED OF THE POS THE FLM PUT THE ASDE-X IN LIMITED MODE. WHEN THE FALSE TARGET DISAPPEARED; THE ASDE-X WAS PUT BACK IN FULL OP. PROB WAS NEVER DIAGNOSED OR FIXED.
Data retrieved from NASA's ASRS site as of January 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.