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Air carrier X TCASII RA unauthorized descent non adherence to ATC clearance conflicting traffic possibly air carrier Y. Pilot deviation.
| Attributes | |
| ACN | 231297 |
| Time | |
| Date | 199212 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 5000 msl bound upper : 5000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| 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 descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 231297 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X steady heading 090 degrees on left downwind 4 mi from runway 27L localizer, advised controller of TCASII RA to descend. The controller noticed a 300 ft descent. 1 other aircraft in close proximity 2000 ft above same heading and air carrier Y 4 mi laterally separated opposite direction on localizer. Communication was after air carrier X had performed maneuver.
Original NASA ASRS Text
Title: ACR X TCASII RA UNAUTH DSCNT NON ADHERENCE TO ATC CLRNC CONFLICTING TFC POSSIBLY ACR Y. PLTDEV.
Narrative: ACR X STEADY HDG 090 DEGS ON L DOWNWIND 4 MI FROM RWY 27L LOC, ADVISED CTLR OF TCASII RA TO DSND. THE CTLR NOTICED A 300 FT DSCNT. 1 OTHER ACFT IN CLOSE PROX 2000 FT ABOVE SAME HDG AND ACR Y 4 MI LATERALLY SEPARATED OPPOSITE DIRECTION ON LOC. COM WAS AFTER ACR X HAD PERFORMED MANEUVER.
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.