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Air carrier X TCASII RA climb had less than standard separation from air carrier Y TCASII descend. Evasive action taken. Possible system error.
| Attributes | |
| ACN | 233651 |
| Time | |
| Date | 199302 |
| Day | Tue |
| 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 | VMC |
| Light | Dusk |
| 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 |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, High Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| 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 : 12000 flight time type : 8000 |
| ASRS Report | 233651 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 3000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X on an assigned heading of 040 degrees at 5000 ft after taking off from runway 22L at ord. Air carrier Y departing ord (runway 9L, I believe) was on 090 degree heading climbing to 5000 ft. When our flight paths crossed, we both received TCASII RA's. He descended to 4600 ft. We climbed to 5200 ft and passed approximately 600 ft vertical and about 1/2 mi horizontal. Ord departure did advise of the traffic but I believe he overestimated our projected passing separation. After landing I called ord ATC watch supervisor. He seemed satisfied with our vector behind traffic despite the TCASII event.
Original NASA ASRS Text
Title: ACR X TCASII RA CLB HAD LTSS FROM ACR Y TCASII DSND. EVASIVE ACTION TAKEN. POSSIBLE SYS ERROR.
Narrative: ACR X ON AN ASSIGNED HDG OF 040 DEGS AT 5000 FT AFTER TAKING OFF FROM RWY 22L AT ORD. ACR Y DEPARTING ORD (RWY 9L, I BELIEVE) WAS ON 090 DEG HDG CLBING TO 5000 FT. WHEN OUR FLT PATHS CROSSED, WE BOTH RECEIVED TCASII RA'S. HE DSNDED TO 4600 FT. WE CLBED TO 5200 FT AND PASSED APPROX 600 FT VERT AND ABOUT 1/2 MI HORIZ. ORD DEP DID ADVISE OF THE TFC BUT I BELIEVE HE OVERESTIMATED OUR PROJECTED PASSING SEPARATION. AFTER LNDG I CALLED ORD ATC WATCH SUPVR. HE SEEMED SATISFIED WITH OUR VECTOR BEHIND TFC DESPITE THE TCASII EVENT.
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.