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Air carrier X TCASII TA RA had possible less than standard separation from aircraft Y. Possible system error. Evasive action taken.
| Attributes | |
| ACN | 249419 |
| Time | |
| Date | 199308 |
| Day | Thu |
| 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 | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord tower : bak |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 16000 flight time type : 3500 |
| ASRS Report | 249419 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
Air carrier X on final approach runway 22R at ord, descending on GS we received TCASII TA followed by RA. -- 'Do not descend.' copilot flying, stopped descent. Looking at TCASII scope, intruder target appeared to be directly at our position, then moved off to easterly direction. I questioned approach controller about traffic Y and he stated it was controled traffic.
Original NASA ASRS Text
Title: ACR X TCASII TA RA HAD POSSIBLE LTSS FROM ACFT Y. POSSIBLE SYS ERROR. EVASIVE ACTION TAKEN.
Narrative: ACR X ON FINAL APCH RWY 22R AT ORD, DSNDING ON GS WE RECEIVED TCASII TA FOLLOWED BY RA. -- 'DO NOT DSND.' COPLT FLYING, STOPPED DSCNT. LOOKING AT TCASII SCOPE, INTRUDER TARGET APPEARED TO BE DIRECTLY AT OUR POS, THEN MOVED OFF TO EASTERLY DIRECTION. I QUESTIONED APCH CTLR ABOUT TFC Y AND HE STATED IT WAS CTLED TFC.
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.