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Flight crew in MD80 with ZOB took evasive action in response to a TCASII RA at FL350.
| Attributes | |
| ACN | 448778 |
| Time | |
| Date | 199909 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : fwa.vortac |
| State Reference | IN |
| Altitude | msl single value : 35000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Make Model Name | Commercial Fixed Wing |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 448778 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to assigned altitude flight crew : took evasive action |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
While cruising at FL350 we got a TCASII TA, immediately followed by a climb RA. We told ZOB we were climbing, responding to an RA. RA stopped as we passed approximately FL360 so we returned to assigned altitude of FL350. After we were back on altitude we asked ZOB if a loss of separation had occurred or if we had received a false warning. Controller stated that a loss of separation had occurred and said we'd hear another voice shortly. The other voice never came and were switched on to the next center sector. I'm wondering what happened to cause this loss of separation. To the best of our knowledge, we were complying with our clearance.
Original NASA ASRS Text
Title: FLC IN MD80 WITH ZOB TOOK EVASIVE ACTION IN RESPONSE TO A TCASII RA AT FL350.
Narrative: WHILE CRUISING AT FL350 WE GOT A TCASII TA, IMMEDIATELY FOLLOWED BY A CLB RA. WE TOLD ZOB WE WERE CLBING, RESPONDING TO AN RA. RA STOPPED AS WE PASSED APPROX FL360 SO WE RETURNED TO ASSIGNED ALT OF FL350. AFTER WE WERE BACK ON ALT WE ASKED ZOB IF A LOSS OF SEPARATION HAD OCCURRED OR IF WE HAD RECEIVED A FALSE WARNING. CTLR STATED THAT A LOSS OF SEPARATION HAD OCCURRED AND SAID WE'D HEAR ANOTHER VOICE SHORTLY. THE OTHER VOICE NEVER CAME AND WERE SWITCHED ON TO THE NEXT CTR SECTOR. I'M WONDERING WHAT HAPPENED TO CAUSE THIS LOSS OF SEPARATION. TO THE BEST OF OUR KNOWLEDGE, WE WERE COMPLYING WITH OUR CLRNC.
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.