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Aircraft on converging course with another aircraft was descended to a lower altitude and separation was lost.
| Attributes | |
| ACN | 151072 |
| Time | |
| Date | 199007 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dsm |
| State Reference | IA |
| Altitude | msl bound lower : 31000 msl bound upper : 32300 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau artcc : zmp |
| Operator | general aviation : corporate |
| Make Model Name | Small 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 non radar : 2 controller radar : 1 |
| ASRS Report | 151072 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 15000 vertical : 1300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure Operational Error |
Narrative:
Small transport eastbound at FL330. Medium large transport nebnd at FL310. Control of small transport was given to chicago center west/0 reference to medium large transport. Small transport started down. Medium large transport was given an immediate descent. Small transport climbed back to FL330. Sep was lost.
Original NASA ASRS Text
Title: ACFT ON CONVERGING COURSE WITH ANOTHER ACFT WAS DESCENDED TO A LOWER ALT AND SEPARATION WAS LOST.
Narrative: SMT EBND AT FL330. MLG NEBND AT FL310. CTL OF SMT WAS GIVEN TO CHICAGO CTR W/0 REFERENCE TO MLG. SMT STARTED DOWN. MLG WAS GIVEN AN IMMEDIATE DSNT. SMT CLBED BACK TO FL330. SEP WAS LOST.
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.