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An air carrier flight crew in a twin engine turbojet were advised of a potential conflict then a TCASII RA confirmed and they avoided the unseen traffic.
| Attributes | |
| ACN | 434030 |
| Time | |
| Date | 199904 |
| Day | Sat |
| Place | |
| Locale Reference | intersection : artur |
| State Reference | TN |
| Altitude | msl bound lower : 8500 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : tys.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : tys.tracon |
| Operator | Other |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 1800 flight time type : 80 |
| ASRS Report | 434030 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne critical |
| Independent Detector | other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory flight crew : took evasive action |
| Miss Distance | vertical : 700 |
| Supplementary | |
| Problem Areas | Airspace Structure |
| Primary Problem | Airspace Structure |
Narrative:
Climbing out of tys direct arthur, ATC notified us of a momentary traffic signal at 10000 ft, 12 O'clock position and it disappeared. We were currently climbing through about 8500 ft to our clearance limit of 10000 ft. The captain and first officer displayed their respective TCASII screens and nothing was indicated. At about 9400 ft, the TCASII called 'traffic' then an immediate descent. Crew complied, ATC notified us of traffic also. We descended to 8500 ft. A clear of conflict was heard and ATC indicated we were also clear. We were reclred to 10000 ft. First indication by ATC reduce climb rate or get clearance to level off at lower altitude. Crew never saw the traffic.
Original NASA ASRS Text
Title: AN ACR FLC IN A TWIN ENG TURBOJET WERE ADVISED OF A POTENTIAL CONFLICT THEN A TCASII RA CONFIRMED AND THEY AVOIDED THE UNSEEN TFC.
Narrative: CLBING OUT OF TYS DIRECT ARTHUR, ATC NOTIFIED US OF A MOMENTARY TFC SIGNAL AT 10000 FT, 12 O'CLOCK POS AND IT DISAPPEARED. WE WERE CURRENTLY CLBING THROUGH ABOUT 8500 FT TO OUR CLRNC LIMIT OF 10000 FT. THE CAPT AND FO DISPLAYED THEIR RESPECTIVE TCASII SCREENS AND NOTHING WAS INDICATED. AT ABOUT 9400 FT, THE TCASII CALLED 'TFC' THEN AN IMMEDIATE DSCNT. CREW COMPLIED, ATC NOTIFIED US OF TFC ALSO. WE DSNDED TO 8500 FT. A CLR OF CONFLICT WAS HEARD AND ATC INDICATED WE WERE ALSO CLR. WE WERE RECLRED TO 10000 FT. FIRST INDICATION BY ATC REDUCE CLB RATE OR GET CLRNC TO LEVEL OFF AT LOWER ALT. CREW NEVER SAW THE TFC.
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.