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ARTCC radar controller had less than standard separation between an large transport descending and 1 descending to altitude vacated by the first large transport.
| Attributes | |
| ACN | 188577 |
| Time | |
| Date | 199109 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dbq |
| State Reference | IA |
| Altitude | msl bound lower : 29500 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 19 controller radar : 18 |
| ASRS Report | 188577 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 1500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
3 commercial jets involved. I descended large transport X from FL310 to FL290 to miss large transport Z who I wasn't talking to and was climbing slowly. Behind the large transport Z was large transport Y who was descending to FL310. Large transport X did not level off in time (at FL290) to avoid a conflict with large transport Y. Both pilots saw the other aircraft. Large transport Z did not lose separation at any time.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR HAD LTSS BTWN AN LGT DSNDING AND 1 DSNDING TO ALT VACATED BY THE FIRST LGT.
Narrative: 3 COMMERCIAL JETS INVOLVED. I DSNDED LGT X FROM FL310 TO FL290 TO MISS LGT Z WHO I WASN'T TALKING TO AND WAS CLBING SLOWLY. BEHIND THE LGT Z WAS LGT Y WHO WAS DSNDING TO FL310. LGT X DID NOT LEVEL OFF IN TIME (AT FL290) TO AVOID A CONFLICT WITH LGT Y. BOTH PLTS SAW THE OTHER ACFT. LGT Z DID NOT LOSE SEPARATION AT ANY TIME.
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.