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ARTCC controller failed to maintain required separation between aircraft due to misjudging the vector needed for the trailing aircraft to maintain standard separation.
| Attributes | |
| ACN | 542632 |
| Time | |
| Date | 200203 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : cgt.vortac |
| State Reference | IN |
| Altitude | msl single value : 7000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Gulfstream IV |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : instructor |
| Qualification | controller : radar |
| Experience | flight time total : 600 |
| ASRS Report | 542632 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : trainee |
| Qualification | controller : developmental |
| Events | |
| Anomaly | non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Miss Distance | horizontal : 24600 vertical : 200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 was being vectored for sequence to mdw localizer runway 31C behind aircraft #2. Amount of vector for aircraft #1 was misjudged and did not maintain 5 mi separation behind aircraft #2.
Original NASA ASRS Text
Title: ARTCC CTLR FAILED TO MAINTAIN REQUIRED SEPARATION BTWN ACFT DUE TO MISJUDGING THE VECTOR NEEDED FOR THE TRAILING ACFT TO MAINTAIN STANDARD SEPARATION.
Narrative: ACFT #1 WAS BEING VECTORED FOR SEQUENCE TO MDW LOC RWY 31C BEHIND ACFT #2. AMOUNT OF VECTOR FOR ACFT #1 WAS MISJUDGED AND DID NOT MAINTAIN 5 MI SEPARATION BEHIND ACFT #2.
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.