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Air carrier X TCASII TA RA had less than standard separation from air carrier Y. Evasive action taken. System error.
| Attributes | |
| ACN | 235293 |
| Time | |
| Date | 199302 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : pxv |
| State Reference | IN |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid artcc : gum |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| 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 : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 210 flight time total : 3500 |
| ASRS Report | 235293 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 7500 flight time type : 5500 |
| ASRS Report | 235292 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 1500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
TCASII RA while level at FL350 on pxu 070096. TCASII alert to descend/crossing descend. Followed TCASII instructions and descended at about 2000 FPM down to FL335. Also deviated heading and turned about 20 degrees to the right. After clear of conflict returned back to radial and back to FL350. Initial heading we were on was center assigned and we were not told to deviate left or right for other traffic. Supplemental information from acn 235292: reported a deviation from altitude because of a TCASII RA. This happened because of a loss of separation caused by poor en route ATC. Our aircraft was at 35000 ft swbound. Air carrier Y was nebound at 35000 ft. We were complying with several radar vectors. While on a radar vector, air carrier Y flew at us and passed inside TCASII RA area. We complied with TCASII RA to descend. The en route controller vectored our aircraft towards the oncoming air carrier Y. The controller also issued descent clearance to air carrier Y, but did so much too late to avoid the conflict. Our aircraft was on assigned heading! There probably was training in progress at the center.
Original NASA ASRS Text
Title: ACR X TCASII TA RA HAD LTSS FROM ACR Y. EVASIVE ACTION TAKEN. SYS ERROR.
Narrative: TCASII RA WHILE LEVEL AT FL350 ON PXU 070096. TCASII ALERT TO DSND/XING DSND. FOLLOWED TCASII INSTRUCTIONS AND DSNDED AT ABOUT 2000 FPM DOWN TO FL335. ALSO DEVIATED HDG AND TURNED ABOUT 20 DEGS TO THE R. AFTER CLR OF CONFLICT RETURNED BACK TO RADIAL AND BACK TO FL350. INITIAL HDG WE WERE ON WAS CTR ASSIGNED AND WE WERE NOT TOLD TO DEVIATE L OR R FOR OTHER TFC. SUPPLEMENTAL INFO FROM ACN 235292: RPTED A DEV FROM ALT BECAUSE OF A TCASII RA. THIS HAPPENED BECAUSE OF A LOSS OF SEPARATION CAUSED BY POOR ENRTE ATC. OUR ACFT WAS AT 35000 FT SWBOUND. ACR Y WAS NEBOUND AT 35000 FT. WE WERE COMPLYING WITH SEVERAL RADAR VECTORS. WHILE ON A RADAR VECTOR, ACR Y FLEW AT US AND PASSED INSIDE TCASII RA AREA. WE COMPLIED WITH TCASII RA TO DSND. THE ENRTE CTLR VECTORED OUR ACFT TOWARDS THE ONCOMING ACR Y. THE CTLR ALSO ISSUED DSCNT CLRNC TO ACR Y, BUT DID SO MUCH TOO LATE TO AVOID THE CONFLICT. OUR ACFT WAS ON ASSIGNED HDG! THERE PROBABLY WAS TRAINING IN PROGRESS AT THE CTR.
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.