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Air carrier X false target TCASII RA climb had less than standard separation from air carrier Y. Evasive action taken.
| Attributes | |
| ACN | 233583 |
| Time | |
| Date | 199301 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 5000 msl bound upper : 6000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord tower : buf |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| 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 |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Experience | controller radar : 15 |
| ASRS Report | 233583 |
| 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 : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 9000 vertical : 700 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X was on a 090 heading at 5000. Air carrier Y was at air carrier X 6 O'clock position and approximately 1 1/2 mi. Air carrier X requested a climb and he said he was receiving a TCASII alert. At that time the controller advised him of the air carrier Y traffic and the controller observed air carrier X at 5300. Traffic had already been issued to air carrier Y. Air carrier X stated someone had gone directly below him. Air carrier X also went into coast status for a short time. The controller advised air carrier X there was no traffic below him, that all observed traffic was above him at 6000, 7000, and 8000. Air carrier X advised he had climbed to 5200. There was a clearance deviation by the TCASII aircraft of 300 ft. Communication was initiated by the TCASII aircraft, however, it was after he had already begun to maneuver. The TCASII maneuver had an effect on other aircraft because he climbed into previously separated traffic. The TCASII was disruptive to traffic flow and the controller's plans. This was apparently a phantom target scenario. There was no observed traffic below air carrier X that would cause a TCASII climb RA. Non-existent traffic caused air carrier X to climb into air carrier Y causing an apparent loss of separation.
Original NASA ASRS Text
Title: ACR X FALSE TARGET TCASII RA CLB HAD LTSS FROM ACR Y. EVASIVE ACTION TAKEN.
Narrative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
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.