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Controller descended an aircraft after observing wrong aircraft target. The descending aircraft passed another aircraft at a level altitude with less than standard separation.
| Attributes | |
| ACN | 144548 |
| Time | |
| Date | 199005 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : oom |
| State Reference | IN |
| Altitude | msl bound lower : 28000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| 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 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 2 |
| ASRS Report | 144548 |
| 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 other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | Other |
| Miss Distance | horizontal : 21000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
An medium large transport northbound on J89 at FL310 descending to FL290. An small transport Z westbound J134 at FL280. I knew the medium large transport needed descent into mdw. I looked at another medium large transport Y at FL280 and gave the medium large transport X a clearance to FL280. Medium large transport X and the small transport Z passed with 3.5 mi and 500' sep. Neither aircraft saw the other aircraft.
Original NASA ASRS Text
Title: CTLR DESCENDED AN ACFT AFTER OBSERVING WRONG ACFT TARGET. THE DESCENDING ACFT PASSED ANOTHER ACFT AT A LEVEL ALT WITH LESS THAN STANDARD SEPARATION.
Narrative: AN MLG NBND ON J89 AT FL310 DSNDING TO FL290. AN SMT Z WBND J134 AT FL280. I KNEW THE MLG NEEDED DSNT INTO MDW. I LOOKED AT ANOTHER MLG Y AT FL280 AND GAVE THE MLG X A CLRNC TO FL280. MLG X AND THE SMT Z PASSED WITH 3.5 MI AND 500' SEP. NEITHER ACFT SAW THE OTHER ACFT.
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.