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An air carrier flight crew responded to a vector clearance with a good rate of turn when the ARTCC radar controller advised of traffic descending through their altitude. The flight crew had acquired the traffic visually, and found it unnecessary to follow the RA commands.
| Attributes | |
| ACN | 327690 |
| Time | |
| Date | 199602 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : tys |
| State Reference | TN |
| Altitude | msl bound lower : 27000 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 327690 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 210 flight time total : 10000 flight time type : 6000 |
| ASRS Report | 327598 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : took evasive action other other |
| Consequence | Other |
| Miss Distance | horizontal : 21000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
In cruise, ATC controller gave us a right turn to 'avoid traffic descending through (our) altitude.' as we started the turn we got a TCASII RA to 'descend, descend now.' the traffic was estimated to be about 3 1/2 mi to our left, a visual was confirmed. Just before acquiring the traffic visually the ATC controller said he would need a 'good rate of turn.' it was during this turn that visual separation was confirmed and TCASII resolution was deemed unnecessary. Aircraft was turned back on course without further incident.
Original NASA ASRS Text
Title: AN ACR FLC RESPONDED TO A VECTOR CLRNC WITH A GOOD RATE OF TURN WHEN THE ARTCC RADAR CTLR ADVISED OF TFC DSNDING THROUGH THEIR ALT. THE FLC HAD ACQUIRED THE TFC VISUALLY, AND FOUND IT UNNECESSARY TO FOLLOW THE RA COMMANDS.
Narrative: IN CRUISE, ATC CTLR GAVE US A R TURN TO 'AVOID TFC DSNDING THROUGH (OUR) ALT.' AS WE STARTED THE TURN WE GOT A TCASII RA TO 'DSND, DSND NOW.' THE TFC WAS ESTIMATED TO BE ABOUT 3 1/2 MI TO OUR L, A VISUAL WAS CONFIRMED. JUST BEFORE ACQUIRING THE TFC VISUALLY THE ATC CTLR SAID HE WOULD NEED A 'GOOD RATE OF TURN.' IT WAS DURING THIS TURN THAT VISUAL SEPARATION WAS CONFIRMED AND TCASII RESOLUTION WAS DEEMED UNNECESSARY. ACFT WAS TURNED BACK ON COURSE WITHOUT FURTHER INCIDENT.
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.