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B727 flight crew were turned off course heading for traffic separation. The ZAU controller turned them the opposite way which resolved the potential conflict.
| Attributes | |
| ACN | 548609 |
| Time | |
| Date | 200205 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : grr.airport |
| State Reference | MI |
| Altitude | msl bound lower : 25300 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc tower : ind.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 6000 flight time type : 3000 |
| ASRS Report | 548609 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance controller : issued advisory flight crew : took precautionary avoidance action |
| Miss Distance | horizontal : 24000 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We were cleared to descend to FL240 when the TCASII gave a TA of 'traffic.'. I leveled off at FL253 because the traffic was straight ahead 200 ft below. ZAU gave us a right 40 degree turn and the traffic continued to remain straight ahead. We asked about the traffic and was told that it was straight ahead 4 NM. We were then told to turn to a heading of 310 degrees. Turning left to that heading, we were then cleared to grr.
Original NASA ASRS Text
Title: B727 FLC WERE TURNED OFF COURSE HDG FOR TFC SEPARATION. THE ZAU CTLR TURNED THEM THE OPPOSITE WAY WHICH RESOLVED THE POTENTIAL CONFLICT.
Narrative: WE WERE CLRED TO DSND TO FL240 WHEN THE TCASII GAVE A TA OF 'TFC.'. I LEVELED OFF AT FL253 BECAUSE THE TFC WAS STRAIGHT AHEAD 200 FT BELOW. ZAU GAVE US A R 40 DEG TURN AND THE TFC CONTINUED TO REMAIN STRAIGHT AHEAD. WE ASKED ABOUT THE TFC AND WAS TOLD THAT IT WAS STRAIGHT AHEAD 4 NM. WE WERE THEN TOLD TO TURN TO A HDG OF 310 DEGS. TURNING L TO THAT HDG, WE WERE THEN CLRED TO GRR.
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.