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Supervisor at oma approach instructs a trainee to turn out a B737 causing a loss of separation with a C172.
| Attributes | |
| ACN | 541975 |
| Time | |
| Date | 200203 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : oma.airport |
| State Reference | NE |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : r90.tracon tower : det.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 14r |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 18 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach instruction : instructor |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach instruction : trainee |
| Qualification | pilot : private |
| Experience | flight time total : 150 |
| ASRS Report | 541974 |
| Events | |
| Anomaly | non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : radar other controllera other controllerb other other : 3 |
| Resolutory Action | flight crew : took evasive action none taken : anomaly accepted |
| Miss Distance | horizontal : 9000 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was instructing on radar east position. The trainee was vectoring a C172 downwind for a practice ILS approach and a B737 for an ILS to the same runway. There was another B737 on approach to a crossing runway. The trainee turned the B737 to intercept the localizer. I told him that wouldn't work, meaning he was a tie with the other B737. The supervisor entered the radar room at this time and said, 'what are you doing, turn the B737 north.' the trainee did as instructed and loss of separation with the C172 occurred.
Original NASA ASRS Text
Title: SUPVR AT OMA APCH INSTRUCTS A TRAINEE TO TURN OUT A B737 CAUSING A LOSS OF SEPARATION WITH A C172.
Narrative: I WAS INSTRUCTING ON RADAR E POS. THE TRAINEE WAS VECTORING A C172 DOWNWIND FOR A PRACTICE ILS APCH AND A B737 FOR AN ILS TO THE SAME RWY. THERE WAS ANOTHER B737 ON APCH TO A XING RWY. THE TRAINEE TURNED THE B737 TO INTERCEPT THE LOC. I TOLD HIM THAT WOULDN'T WORK, MEANING HE WAS A TIE WITH THE OTHER B737. THE SUPVR ENTERED THE RADAR ROOM AT THIS TIME AND SAID, 'WHAT ARE YOU DOING, TURN THE B737 N.' THE TRAINEE DID AS INSTRUCTED AND LOSS OF SEPARATION WITH THE C172 OCCURRED.
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.