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Too many aircraft at the same altitude results in less than standard separation when the controller tries to keep them separated.
| Attributes | |
| ACN | 227756 |
| Time | |
| Date | 199212 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : hmv |
| State Reference | TN |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | other |
| Make Model Name | Military Transport |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 227756 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | horizontal : 21000 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Intra Facility Coordination Failure Operational Error |
Narrative:
Bmb X was a flight of 2 eastbound at FL310 B330. The flight was being monitored as potential traffic with air carrier Y swbound at FL310 and an air carrier northbound at FL330. I then became aware of air carrier Z nwbound at FL310. I turned bmb X to heading 160 degrees to miss air carrier Z, but turn created confliction with air carrier Y. Additional turns were inadequate for separation. Air carrier Z had been pointed out to the radar associate controller, who failed to inform radar controller of his action.
Original NASA ASRS Text
Title: TOO MANY ACFT AT THE SAME ALT RESULTS IN LTSS WHEN THE CTLR TRIES TO KEEP THEM SEPARATED.
Narrative: BMB X WAS A FLT OF 2 EBOUND AT FL310 B330. THE FLT WAS BEING MONITORED AS POTENTIAL TFC WITH ACR Y SWBOUND AT FL310 AND AN ACR NBOUND AT FL330. I THEN BECAME AWARE OF ACR Z NWBOUND AT FL310. I TURNED BMB X TO HDG 160 DEGS TO MISS ACR Z, BUT TURN CREATED CONFLICTION WITH ACR Y. ADDITIONAL TURNS WERE INADEQUATE FOR SEPARATION. ACR Z HAD BEEN POINTED OUT TO THE RADAR ASSOCIATE CTLR, WHO FAILED TO INFORM RADAR CTLR OF HIS ACTION.
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.