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Less than standard separation occurred when ARTCC radar controller descended an aircraft through the altitude of opposite direction traffic.
| Attributes | |
| ACN | 160592 |
| Time | |
| Date | 199010 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : jhw |
| State Reference | NY |
| Altitude | msl bound lower : 28000 msl bound upper : 28300 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob artcc : zfw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent 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 | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 4 controller non radar : 6 controller radar : 12 |
| ASRS Report | 160592 |
| 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 | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 28200 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Controling 17 aircraft with a marked degree of complexity. 10 of the aircraft were in potential conflict. Medium large transport X was nebnd at FL290. Medium large transport Y was swbnd at FL280. Medium large transport X was descending to FL270. Assuming I had latitude sep, became so grossly involved in other potential conflicts that I wasn't aware of loss of sep until C/a activated. C/a activated a mere 7 seconds prior to aircraft passing each other 4.7 mi apart. Sector was nearly unmanageable. Better flow control is needed.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION OCCURRED WHEN ARTCC RADAR CTLR DESCENDED AN ACFT THROUGH THE ALT OF OPPOSITE DIRECTION TRAFFIC.
Narrative: CTLING 17 ACFT WITH A MARKED DEGREE OF COMPLEXITY. 10 OF THE ACFT WERE IN POTENTIAL CONFLICT. MLG X WAS NEBND AT FL290. MLG Y WAS SWBND AT FL280. MLG X WAS DSNDING TO FL270. ASSUMING I HAD LAT SEP, BECAME SO GROSSLY INVOLVED IN OTHER POTENTIAL CONFLICTS THAT I WASN'T AWARE OF LOSS OF SEP UNTIL C/A ACTIVATED. C/A ACTIVATED A MERE 7 SECS PRIOR TO ACFT PASSING EACH OTHER 4.7 MI APART. SECTOR WAS NEARLY UNMANAGEABLE. BETTER FLOW CTL IS NEEDED.
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.