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ARTCC controller at ZAU instructed air carrier at FL330 to turn right and descend, then gave a tight turn left. Flight crew received TCASII RA to climb.
| Attributes | |
| ACN | 449468 |
| Time | |
| Date | 199909 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| State Reference | MI |
| Altitude | msl bound lower : 31800 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : descent cruise : enroute altitude change descent : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Make Model Name | Commercial Fixed Wing |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 50 flight time total : 16000 flight time type : 8800 |
| ASRS Report | 449468 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Miss Distance | vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Deviated from ATC clearance to comply with TCASII RA. ZAU gave us a turn off course to the right for descent and instructed us to descend from FL330 to FL270. A short time later, center instructed us to turn left 'tight turn' heading 060 degrees. A bank angle of 30 degrees was selected on the MCP and the turn initiated. While in the turn and descending, an RA alert was received, followed by instructions to climb. The autoplt was disconnected, ATC notified that we were climbing to comply with the RA, and a climb was initiated to an altitude of FL328 where the traffic was noticed passing 1900 ft below us. At the point when the descent was stopped and the climb initiated, the traffic was 800 ft below us.
Original NASA ASRS Text
Title: ARTCC CTLR AT ZAU INSTRUCTED ACR AT FL330 TO TURN R AND DSND, THEN GAVE A TIGHT TURN L. FLC RECEIVED TCASII RA TO CLB.
Narrative: DEVIATED FROM ATC CLRNC TO COMPLY WITH TCASII RA. ZAU GAVE US A TURN OFF COURSE TO THE R FOR DSCNT AND INSTRUCTED US TO DSND FROM FL330 TO FL270. A SHORT TIME LATER, CTR INSTRUCTED US TO TURN L 'TIGHT TURN' HDG 060 DEGS. A BANK ANGLE OF 30 DEGS WAS SELECTED ON THE MCP AND THE TURN INITIATED. WHILE IN THE TURN AND DSNDING, AN RA ALERT WAS RECEIVED, FOLLOWED BY INSTRUCTIONS TO CLB. THE AUTOPLT WAS DISCONNECTED, ATC NOTIFIED THAT WE WERE CLBING TO COMPLY WITH THE RA, AND A CLB WAS INITIATED TO AN ALT OF FL328 WHERE THE TFC WAS NOTICED PASSING 1900 FT BELOW US. AT THE POINT WHEN THE DSCNT WAS STOPPED AND THE CLB INITIATED, THE TFC WAS 800 FT BELOW US.
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.