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L30 controller experienced less than standard separation at 9500 ft with 2 arrival aircraft when issuing turns. Incident occurred shortly after assuming position.
| Attributes | |
| ACN | 701234 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 9500 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : l30.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : l30.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : developmental |
| Experience | controller radar : 6 controller time certified in position2 : 2 |
| ASRS Report | 701234 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I took over the position from another controller and immediately had to take action to avoid a conflict. I turned the trail aircraft; called traffic; and then turned back to follow. The aircraft turned very wide conflicting with another aircraft descending via another arrival. I attempted to correct with a turn and altitude but it was too late. What should I have done? Not taken the position until the original potential conflict was resolved. I perhaps should have not made so great of an initial turn and used altitude quicker on the third aircraft.
Original NASA ASRS Text
Title: L30 CTLR EXPERIENCED LTSS AT 9500 FT WITH 2 ARR ACFT WHEN ISSUING TURNS. INCIDENT OCCURRED SHORTLY AFTER ASSUMING POS.
Narrative: I TOOK OVER THE POS FROM ANOTHER CTLR AND IMMEDIATELY HAD TO TAKE ACTION TO AVOID A CONFLICT. I TURNED THE TRAIL ACFT; CALLED TFC; AND THEN TURNED BACK TO FOLLOW. THE ACFT TURNED VERY WIDE CONFLICTING WITH ANOTHER ACFT DSNDING VIA ANOTHER ARR. I ATTEMPTED TO CORRECT WITH A TURN AND ALT BUT IT WAS TOO LATE. WHAT SHOULD I HAVE DONE? NOT TAKEN THE POS UNTIL THE ORIGINAL POTENTIAL CONFLICT WAS RESOLVED. I PERHAPS SHOULD HAVE NOT MADE SO GREAT OF AN INITIAL TURN AND USED ALT QUICKER ON THE THIRD ACFT.
Data retrieved from NASA's ASRS site as of January 2009 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.