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TRACON radar controller turned small transport too close to the air carrier aircraft, which resulted in less than standard separation.
| Attributes | |
| ACN | 175038 |
| Time | |
| Date | 199104 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : grr |
| State Reference | MI |
| Altitude | msl bound lower : 2700 msl bound upper : 2700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : grr |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport |
| Flight Phase | cruise other |
| Route In Use | approach : straight in arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 175038 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance none taken : insufficient time |
| Consequence | Other |
| Miss Distance | horizontal : 15000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Small transport being vectored for practice ILS approach to runway 26L. Small transport was turned to 180 degree heading to follow an air carrier on approach. I, as controller, noticed small transport increasing speed causing sep to start decrease. I turned small transport to 270 degree heading. C/a went off. I turned small transport to right turn to 100 degree heading, which made it go from paralleling courses to diverging course. Factors contributing were strong winds and lack of coordination between approach controllers. To prevent further occurrences, both controllers operating in the radar room should have better communication and coordination. However, I feel that I took the only course of action I could take to prevent sep to decrease. Another contributing factor was speed reduction on the lead aircraft being withheld from the controller working the trailing aircraft.
Original NASA ASRS Text
Title: TRACON RADAR CTLR TURNED SMT TOO CLOSE TO THE ACR ACFT, WHICH RESULTED IN LESS THAN STANDARD SEPARATION.
Narrative: SMT BEING VECTORED FOR PRACTICE ILS APCH TO RWY 26L. SMT WAS TURNED TO 180 DEG HDG TO FOLLOW AN ACR ON APCH. I, AS CTLR, NOTICED SMT INCREASING SPD CAUSING SEP TO START DECREASE. I TURNED SMT TO 270 DEG HDG. C/A WENT OFF. I TURNED SMT TO RIGHT TURN TO 100 DEG HDG, WHICH MADE IT GO FROM PARALLELING COURSES TO DIVERGING COURSE. FACTORS CONTRIBUTING WERE STRONG WINDS AND LACK OF COORD BTWN APCH CTLRS. TO PREVENT FURTHER OCCURRENCES, BOTH CTLRS OPERATING IN THE RADAR ROOM SHOULD HAVE BETTER COM AND COORD. HOWEVER, I FEEL THAT I TOOK THE ONLY COURSE OF ACTION I COULD TAKE TO PREVENT SEP TO DECREASE. ANOTHER CONTRIBUTING FACTOR WAS SPD REDUCTION ON THE LEAD ACFT BEING WITHHELD FROM THE CTLR WORKING THE TRAILING ACFT.
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.