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ATC equipment problem radar ARTS. Non display of target caused less than standard separation between air carrier X and Y. System error.
| Attributes | |
| ACN | 278902 |
| Time | |
| Date | 199408 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : stl |
| State Reference | MO |
| Altitude | msl bound lower : 4500 msl bound upper : 4500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : stl artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 3 |
| ASRS Report | 278902 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 9000 vertical : 500 |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | Operational Error |
| Situations | |
| Navigational Aid | Unspecified |
Narrative:
I was working arrival north. When I assumed the position I observed that the scope had arrival south's tags depicted (with an 'south'). We were spacing arrs 4 mi apart and landing runway 12R. While working I heard arrival south slow an aircraft to 150 KTS. The aircraft I saw that he had on final was inside the final approach fix so I double-checked all the arrival tags on final and noticed an 'south' without a data block approximately 1 1/2 mi.
Original NASA ASRS Text
Title: ATC EQUIP PROB RADAR ARTS. NON DISPLAY OF TARGET CAUSED LTSS BTWN ACR X AND Y. SYS ERROR.
Narrative: I WAS WORKING ARR N. WHEN I ASSUMED THE POS I OBSERVED THAT THE SCOPE HAD ARR S'S TAGS DEPICTED (WITH AN 'S'). WE WERE SPACING ARRS 4 MI APART AND LNDG RWY 12R. WHILE WORKING I HEARD ARR S SLOW AN ACFT TO 150 KTS. THE ACFT I SAW THAT HE HAD ON FINAL WAS INSIDE THE FINAL APCH FIX SO I DOUBLE-CHKED ALL THE ARR TAGS ON FINAL AND NOTICED AN 'S' WITHOUT A DATA BLOCK APPROX 1 1/2 MI.
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.