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Potential conflict less than standard separation loss of separation in descent through occupied altitude.
| Attributes | |
| ACN | 233318 |
| Time | |
| Date | 199302 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zau |
| State Reference | IL |
| Altitude | msl bound lower : 25000 msl bound upper : 27500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Heavy Transport, Low Wing, 4 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 14700 flight time type : 900 |
| ASRS Report | 233318 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 11000 |
| ASRS Report | 232761 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 10000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
Descending on knox arrival into ord from FL370 to FL250, TA sounded on TCASII out of FL280. We visually acquired aircraft at 10 O'clock position, approximately 800 ft below our altitude, in a right turn toward a path behind us. Shortly thereafter a TCASII RA sounded commanding a climb. Conflict aircraft was at our altitude in a hard right turn. Concurrent with this ATC ordered continued descent and a right turn of approximately 075 degrees, which we did. Target aircraft passed no closer than 3 mi from us.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT LTSS LOSS OF SEPARATION IN DSCNT THROUGH OCCUPIED ALT.
Narrative: DSNDING ON KNOX ARR INTO ORD FROM FL370 TO FL250, TA SOUNDED ON TCASII OUT OF FL280. WE VISUALLY ACQUIRED ACFT AT 10 O'CLOCK POS, APPROX 800 FT BELOW OUR ALT, IN A R TURN TOWARD A PATH BEHIND US. SHORTLY THEREAFTER A TCASII RA SOUNDED COMMANDING A CLB. CONFLICT ACFT WAS AT OUR ALT IN A HARD R TURN. CONCURRENT WITH THIS ATC ORDERED CONTINUED DSCNT AND A R TURN OF APPROX 075 DEGS, WHICH WE DID. TARGET ACFT PASSED NO CLOSER THAN 3 MI FROM US.
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.