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A ZDC controller started air carrier X down too soon, not realizing at first that there was opposite direction cpr traffic 2000 ft below air carrier X. ZDC, dc.
| Attributes | |
| ACN | 455698 |
| Time | |
| Date | 199911 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zdc.artcc |
| State Reference | DC |
| Altitude | msl bound lower : 36600 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute airway : j61.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j61.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 5 controller radar : 13 |
| ASRS Report | 455698 |
| 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 alert |
| Miss Distance | horizontal : 12600 vertical : 1800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Cpr aircraft Y level at FL350, sbound on J61. Air carrier X nebound at FL370. Controller started air carrier X down to FL280. Controller realized conflict and climbed aircraft X back to FL370. Air carrier X mode C never showed below FL366 but aircraft X didn't report back to FL370 prior to lateral separation being established.
Original NASA ASRS Text
Title: A ZDC CTLR STARTED ACR X DOWN TOO SOON, NOT REALIZING AT FIRST THAT THERE WAS OPPOSITE DIRECTION CPR TFC 2000 FT BELOW ACR X. ZDC, DC.
Narrative: CPR ACFT Y LEVEL AT FL350, SBOUND ON J61. ACR X NEBOUND AT FL370. CTLR STARTED ACR X DOWN TO FL280. CTLR REALIZED CONFLICT AND CLBED ACFT X BACK TO FL370. ACR X MODE C NEVER SHOWED BELOW FL366 BUT ACFT X DIDN'T RPT BACK TO FL370 PRIOR TO LATERAL SEPARATION BEING ESTABLISHED.
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.