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ZDV ARTCC controller lost separation when he turned an air carrier too closely to traffic for spacing. The controller's action also resulted in a TCASII RA causing a loss of separation with third aircraft at a lower altitude.
| Attributes | |
| ACN | 494380 |
| Time | |
| Date | 200012 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : als.vor |
| State Reference | CO |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc tower : dfw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdv.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 17 |
| ASRS Report | 494380 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure |
| Independent Detector | aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Miss Distance | horizontal : 19200 vertical : 0 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was vectoring air carrier X for in-trail spacing to phoenix. I turned him to a heading of 150 degree for the spacing. That put him in conflict with air carrier Y, both aircraft were at FL310. I waited about 1 min before I turned air carrier X to a 240 degree heading and back on course. I then turned air carrier Y to a 350 degree heading to go behind air carrier X. Separation was lost and closest proximity was about 3 mi. Furthermore, both aircraft received TCASII alerts and responded. Air carrier Y descended with an aircraft (air carrier Z) at FL290 underneath him. Separation was lost between air carrier Y and air carrier Z.
Original NASA ASRS Text
Title: ZDV ARTCC CTLR LOST SEPARATION WHEN HE TURNED AN ACR TOO CLOSELY TO TFC FOR SPACING. THE CTLR'S ACTION ALSO RESULTED IN A TCASII RA CAUSING A LOSS OF SEPARATION WITH THIRD ACFT AT A LOWER ALT.
Narrative: I WAS VECTORING ACR X FOR IN-TRAIL SPACING TO PHOENIX. I TURNED HIM TO A HDG OF 150 DEG FOR THE SPACING. THAT PUT HIM IN CONFLICT WITH ACR Y, BOTH ACFT WERE AT FL310. I WAITED ABOUT 1 MIN BEFORE I TURNED ACR X TO A 240 DEG HDG AND BACK ON COURSE. I THEN TURNED ACR Y TO A 350 DEG HDG TO GO BEHIND ACR X. SEPARATION WAS LOST AND CLOSEST PROX WAS ABOUT 3 MI. FURTHERMORE, BOTH ACFT RECEIVED TCASII ALERTS AND RESPONDED. ACR Y DSNDED WITH AN ACFT (ACR Z) AT FL290 UNDERNEATH HIM. SEPARATION WAS LOST BTWN ACR Y AND ACR Z.
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.