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C90 controller does not recognize potential conflict between and en route BE58 and a JS31 on approach to mdw until conflict alert activates.
| Attributes | |
| ACN | 451037 |
| Time | |
| Date | 199910 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mdw.airport |
| State Reference | IL |
| Altitude | msl single value : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 31 |
| Operating Under FAR Part | Part 119 |
| Navigation In Use | ils localizer & glide slope : 4r |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | general aviation : personal |
| Make Model Name | Baron 58/58TC |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Experience | controller limited radar : 5 controller non radar : 2 controller radar : 7 controller time certified in position1 : 6 |
| ASRS Report | 451037 |
| 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 : conflict alert other controllera |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 10800 vertical : 300 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Airspace Structure ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Intra Facility Coordination Failure Operational Error |
Narrative:
I just took over the position and the previous controller took a pointout on an airplane wbound at 4000 ft. He failed to inform me of this during the position briefing. I cleared airplane X for the ILS approach to maintain 2600 ft until established on the localizer. Aircraft Y was supposed to be over kedzi OM on a wbound heading but was at cadon OM on a 250 degree heading. Aircraft X did not descend to 2600 ft and flew the GS and was at cadon at 4000 ft. I noticed the traffic conflict and called traffic and tried to descend aircraft X. I could not turn aircraft X because of another aircraft on base leg for runway 4R. Aircraft X did not see aircraft Y when traffic was pointed out and separation was lost.
Original NASA ASRS Text
Title: C90 CTLR DOES NOT RECOGNIZE POTENTIAL CONFLICT BTWN AND ENRTE BE58 AND A JS31 ON APCH TO MDW UNTIL CONFLICT ALERT ACTIVATES.
Narrative: I JUST TOOK OVER THE POS AND THE PREVIOUS CTLR TOOK A POINTOUT ON AN AIRPLANE WBOUND AT 4000 FT. HE FAILED TO INFORM ME OF THIS DURING THE POS BRIEFING. I CLRED AIRPLANE X FOR THE ILS APCH TO MAINTAIN 2600 FT UNTIL ESTABLISHED ON THE LOC. ACFT Y WAS SUPPOSED TO BE OVER KEDZI OM ON A WBOUND HDG BUT WAS AT CADON OM ON A 250 DEG HDG. ACFT X DID NOT DSND TO 2600 FT AND FLEW THE GS AND WAS AT CADON AT 4000 FT. I NOTICED THE TFC CONFLICT AND CALLED TFC AND TRIED TO DSND ACFT X. I COULD NOT TURN ACFT X BECAUSE OF ANOTHER ACFT ON BASE LEG FOR RWY 4R. ACFT X DID NOT SEE ACFT Y WHEN TFC WAS POINTED OUT AND SEPARATION 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.