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An air carrier MD11 had to take evasive action to avoid traffic passing 400 ft above their assigned altitude of FL250.
| Attributes | |
| ACN | 391371 |
| Time | |
| Date | 199801 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fuz |
| State Reference | TX |
| Altitude | msl bound lower : 24400 msl bound upper : 25400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw |
| Operator | common carrier : air carrier |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 391371 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I left my assigned altitude of FL250 to go down to FL244 because we got a tcacsii RA. My first officer had the aircraft in sight and we passed about 700 ft under the aircraft. The altitude separation would have been 700 ft if we had stayed at FL250. We descended to FL244 so the separation was greater than 1000 ft.
Original NASA ASRS Text
Title: AN ACR MD11 HAD TO TAKE EVASIVE ACTION TO AVOID TFC PASSING 400 FT ABOVE THEIR ASSIGNED ALT OF FL250.
Narrative: I LEFT MY ASSIGNED ALT OF FL250 TO GO DOWN TO FL244 BECAUSE WE GOT A TCACSII RA. MY FO HAD THE ACFT IN SIGHT AND WE PASSED ABOUT 700 FT UNDER THE ACFT. THE ALT SEPARATION WOULD HAVE BEEN 700 FT IF WE HAD STAYED AT FL250. WE DSNDED TO FL244 SO THE SEPARATION WAS GREATER THAN 1000 FT.
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.