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ARTS data block disappeared from tower and TRACON radar scope due to intermittent erroneous altitude readings.
| Attributes | |
| ACN | 128840 |
| Time | |
| Date | 198911 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw tower : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other descent : approach |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 5 controller radar : 16 |
| ASRS Report | 128840 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | other physical facility |
Narrative:
Air carrier X was on approach to runway 18R during IFR conditions with simultaneous approachs in progress to runway 17L. Approachs were being radar monitored. The aircraft had been level at 3000' MSL for quite some time when the ARTS 303 suddenly displayed an altitude of 7000' MSL for 2-3 sweeps. This caused the tag of air carrier X to disappear from the tower radar and the final monitor radar since the erroneous ARTS 303 data showed the aircraft to be above the altitude filter limits of 6000'. The correct altitude returned for 2-3 sweeps and then reverted back to the erroneous 7000' for another 2-3 sweeps. The tag had to be manually displayed on the scopes again to continue the monitor.
Original NASA ASRS Text
Title: ARTS DATA BLOCK DISAPPEARED FROM TWR AND TRACON RADAR SCOPE DUE TO INTERMITTENT ERRONEOUS ALT READINGS.
Narrative: ACR X WAS ON APCH TO RWY 18R DURING IFR CONDITIONS WITH SIMULTANEOUS APCHS IN PROGRESS TO RWY 17L. APCHS WERE BEING RADAR MONITORED. THE ACFT HAD BEEN LEVEL AT 3000' MSL FOR QUITE SOME TIME WHEN THE ARTS 303 SUDDENLY DISPLAYED AN ALT OF 7000' MSL FOR 2-3 SWEEPS. THIS CAUSED THE TAG OF ACR X TO DISAPPEAR FROM THE TWR RADAR AND THE FINAL MONITOR RADAR SINCE THE ERRONEOUS ARTS 303 DATA SHOWED THE ACFT TO BE ABOVE THE ALT FILTER LIMITS OF 6000'. THE CORRECT ALT RETURNED FOR 2-3 SWEEPS AND THEN REVERTED BACK TO THE ERRONEOUS 7000' FOR ANOTHER 2-3 SWEEPS. THE TAG HAD TO BE MANUALLY DISPLAYED ON THE SCOPES AGAIN TO CONTINUE THE MONITOR.
Data retrieved from NASA's ASRS site as of August 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.