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While transitioning to darc, controller has less than standard separation with 2 air carrier's at the same altitude.
| Attributes | |
| ACN | 214060 |
| Time | |
| Date | 199206 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : abi |
| State Reference | TX |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw tower : bna |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 2 |
| ASRS Report | 214060 |
| 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 |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 1600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working hecoe, aqn and ednas sectors combined. At XX30 local. NAS was shut down and we went to darc/host. I made several keyboard entries after the transition, and at XX38 I observed 2 aircraft converging at FL330. I took immediate action to try to maintain separation. I issued a clearance to air carrier X to turn 45 degree left and air carrier Y to descend to FL240 and expedite through FL310. Air carrier X replied 'say again.' I then told air carrier X to turn 90 degree left and air carrier Y to turn right heading 180. Air carrier Y responding that he was climbing up for traffic. I then asked air carrier Y to say altitude leaving because mode C indicated FL330. Air carrier Y said he was at FL340 descending. At this point, the mode C data and pilot reports and clrncs issued are at such variance with each other that I had to rely on additional pilot reports. To continue an attempt at maintaining separation.
Original NASA ASRS Text
Title: WHILE TRANSITIONING TO DARC, CTLR HAS LTSS WITH 2 ACR'S AT THE SAME ALT.
Narrative: I WAS WORKING HECOE, AQN AND EDNAS SECTORS COMBINED. AT XX30 LCL. NAS WAS SHUT DOWN AND WE WENT TO DARC/HOST. I MADE SEVERAL KEYBOARD ENTRIES AFTER THE TRANSITION, AND AT XX38 I OBSERVED 2 ACFT CONVERGING AT FL330. I TOOK IMMEDIATE ACTION TO TRY TO MAINTAIN SEPARATION. I ISSUED A CLRNC TO ACR X TO TURN 45 DEG L AND ACR Y TO DSND TO FL240 AND EXPEDITE THROUGH FL310. ACR X REPLIED 'SAY AGAIN.' I THEN TOLD ACR X TO TURN 90 DEG L AND ACR Y TO TURN R HDG 180. ACR Y RESPONDING THAT HE WAS CLBING UP FOR TFC. I THEN ASKED ACR Y TO SAY ALT LEAVING BECAUSE MODE C INDICATED FL330. ACR Y SAID HE WAS AT FL340 DSNDING. AT THIS POINT, THE MODE C DATA AND PLT RPTS AND CLRNCS ISSUED ARE AT SUCH VARIANCE WITH EACH OTHER THAT I HAD TO RELY ON ADDITIONAL PLT RPTS. TO CONTINUE AN ATTEMPT AT MAINTAINING SEPARATION.
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.