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Flight crew of an airbus A320 climbed in response to a TCASII RA. After climbing 500 ft, an unknown aircraft passed off the left side approximately 900 ft below and 2 mi horizontally. Flight crew returned to assigned altitude and were handed off to another controller with no comment or explanation for loss of separation by ATC.
| Attributes | |
| ACN | 394957 |
| Time | |
| Date | 199802 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : fwa |
| State Reference | IN |
| Altitude | msl bound lower : 39000 msl bound upper : 39500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 8000 flight time type : 12000 |
| ASRS Report | 394957 |
| 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 other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 900 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Approaching fwa VOR ATC cleared us to climb from FL370 to FL390 for traffic. Shortly after leveling at FL390 we received a TCASII TA. A few seconds later a TCASII climb RA. We complied with the RA and notified ATC. We climbed to approximately FL395 and the traffic passed off to our left. After returning to our assigned altitude ATC handed us off to another frequency without further comment or explanation.
Original NASA ASRS Text
Title: FLC OF AN AIRBUS A320 CLBED IN RESPONSE TO A TCASII RA. AFTER CLBING 500 FT, AN UNKNOWN ACFT PASSED OFF THE L SIDE APPROX 900 FT BELOW AND 2 MI HORIZLY. FLC RETURNED TO ASSIGNED ALT AND WERE HANDED OFF TO ANOTHER CTLR WITH NO COMMENT OR EXPLANATION FOR LOSS OF SEPARATION BY ATC.
Narrative: APCHING FWA VOR ATC CLRED US TO CLB FROM FL370 TO FL390 FOR TFC. SHORTLY AFTER LEVELING AT FL390 WE RECEIVED A TCASII TA. A FEW SECONDS LATER A TCASII CLB RA. WE COMPLIED WITH THE RA AND NOTIFIED ATC. WE CLBED TO APPROX FL395 AND THE TFC PASSED OFF TO OUR L. AFTER RETURNING TO OUR ASSIGNED ALT ATC HANDED US OFF TO ANOTHER FREQ WITHOUT FURTHER COMMENT OR EXPLANATION.
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.