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A fokker 100 captain was responding to a TCASII RA when the controller countermanded the TCASII, saying stop the descent.
| Attributes | |
| ACN | 449719 |
| Time | |
| Date | 199909 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : bearz |
| State Reference | IL |
| Altitude | msl bound lower : 10900 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival star : kokomo 1 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 15200 flight time type : 4500 |
| ASRS Report | 449719 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure |
| Independent Detector | other controllerb other flight crewa other flight crewb |
| Resolutory Action | controller : separated traffic flight crew : took evasive action |
| Miss Distance | horizontal : 5280 vertical : 300 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft ATC Human Performance Airspace Structure |
| Primary Problem | Airspace Structure |
Narrative:
We were on the arrival to ord on the kokomi 1 arrival from clt to ord. ZAU cleared us on descent from FL240 to 11000 ft saying not to delay in the descent and to keep the speed at 310 KTS. Prior to leveloff at 11000 ft, 12-15 mi ssw of bearz intersection, we had a TA, followed by an RA to 'descend, descend,' which I followed for about 300 ft until clear of conflict. At the same time, ATC told us to stop descent. The traffic in conflict was another carrier following a climb RA they had from a VFR aircraft at 9500 ft. They came within 300 ft vertical, according to TCASII, but neither the first officer nor I had a visual with the aircraft. We never had to go below 11000 ft, by more than 100 ft once we were cleared of the conflict.
Original NASA ASRS Text
Title: A FOKKER 100 CAPT WAS RESPONDING TO A TCASII RA WHEN THE CTLR COUNTERMANDED THE TCASII, SAYING STOP THE DSCNT.
Narrative: WE WERE ON THE ARR TO ORD ON THE KOKOMI 1 ARR FROM CLT TO ORD. ZAU CLRED US ON DSCNT FROM FL240 TO 11000 FT SAYING NOT TO DELAY IN THE DSCNT AND TO KEEP THE SPD AT 310 KTS. PRIOR TO LEVELOFF AT 11000 FT, 12-15 MI SSW OF BEARZ INTXN, WE HAD A TA, FOLLOWED BY AN RA TO 'DSND, DSND,' WHICH I FOLLOWED FOR ABOUT 300 FT UNTIL CLR OF CONFLICT. AT THE SAME TIME, ATC TOLD US TO STOP DSCNT. THE TFC IN CONFLICT WAS ANOTHER CARRIER FOLLOWING A CLB RA THEY HAD FROM A VFR ACFT AT 9500 FT. THEY CAME WITHIN 300 FT VERT, ACCORDING TO TCASII, BUT NEITHER THE FO NOR I HAD A VISUAL WITH THE ACFT. WE NEVER HAD TO GO BELOW 11000 FT, BY MORE THAN 100 FT ONCE WE WERE CLRED OF THE CONFLICT.
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.