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Air carrier X climb to occupied altitude had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 212101 |
| Time | |
| Date | 199206 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : drk |
| State Reference | AZ |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zab |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 21 controller supervisory : 6 |
| ASRS Report | 212101 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| 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 other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 25500 vertical : 1600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was the radar controller working the midnight confign (6 sectors combined on 1). Traffic was heavy but routine with a 20 mi in-trail restriction on las landers. I had climbed air carrier X phx-las to FL310 then noticed an overflt air carrier Y, FL300 was landing las also. I reduced air carrier X to 250 KTS to establish 20 mi in-trail but neglected to stop him below air carrier Y to assure vertical separation. I was distracted by other events in the sector and when I noticed the 2 aircraft were going to be in conflict, i.e., air carrier X climbing out of FL295, I descended air carrier X back down to FL290 and issued a turn to the left to air carrier Y to 270. But standard separation was lost with 1600 ft vertical and 4.25 mi lateral. I should have called for my assistant controller when the sector started getting busy.
Original NASA ASRS Text
Title: ACR X CLB TO OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: I WAS THE RADAR CTLR WORKING THE MIDNIGHT CONFIGN (6 SECTORS COMBINED ON 1). TFC WAS HVY BUT ROUTINE WITH A 20 MI IN-TRAIL RESTRICTION ON LAS LANDERS. I HAD CLBED ACR X PHX-LAS TO FL310 THEN NOTICED AN OVERFLT ACR Y, FL300 WAS LNDG LAS ALSO. I REDUCED ACR X TO 250 KTS TO ESTABLISH 20 MI IN-TRAIL BUT NEGLECTED TO STOP HIM BELOW ACR Y TO ASSURE VERT SEPARATION. I WAS DISTRACTED BY OTHER EVENTS IN THE SECTOR AND WHEN I NOTICED THE 2 ACFT WERE GOING TO BE IN CONFLICT, I.E., ACR X CLBING OUT OF FL295, I DSNDED ACR X BACK DOWN TO FL290 AND ISSUED A TURN TO THE L TO ACR Y TO 270. BUT STANDARD SEPARATION WAS LOST WITH 1600 FT VERT AND 4.25 MI LATERAL. I SHOULD HAVE CALLED FOR MY ASSISTANT CTLR WHEN THE SECTOR STARTED GETTING BUSY.
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.