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Large transport reply to wrong call sign and descended to same altitude as small transport with less than standard separation.
| Attributes | |
| ACN | 195305 |
| Time | |
| Date | 199111 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 7000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 195305 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
I worked final for runway 27R at O'hare. I cleared air carrier abc for approach. I did not hear large transport X (air carrier abb) who was on heading 180 at 8000 ft acknowledge for the approach clearance. Large transport X descended into small transport Y on downwind descending out of 7000 ft. Loss of separation occurred even though I vectored the 2 aircraft away.
Original NASA ASRS Text
Title: LGT REPLY TO WRONG CALL SIGN AND DSNDED TO SAME ALT AS SMT WITH LTSS.
Narrative: I WORKED FINAL FOR RWY 27R AT O'HARE. I CLRED ACR ABC FOR APCH. I DID NOT HEAR LGT X (ACR ABB) WHO WAS ON HDG 180 AT 8000 FT ACKNOWLEDGE FOR THE APCH CLRNC. LGT X DSNDED INTO SMT Y ON DOWNWIND DSNDING OUT OF 7000 FT. LOSS OF SEPARATION OCCURRED EVEN THOUGH I VECTORED THE 2 ACFT AWAY.
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.