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Flight crew of a fokker 100 leveled off at assigned arrival descent altitude, of which happened to coincide with ARTCC controller's delayed instructions to them to stop their descent and the all clear given by their TCASII for which they were responding.
| Attributes | |
| ACN | 449857 |
| Time | |
| Date | 199909 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : bearz |
| State Reference | IN |
| Altitude | msl bound lower : 11000 msl bound upper : 11300 |
| 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 |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival star : okk.okk.okk1 |
| 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 Phase | climbout : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 300 flight time total : 11500 flight time type : 5000 |
| ASRS Report | 449857 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : nmac non adherence : required legal separation non adherence : clearance |
| Independent Detector | aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory controller : issued new clearance flight crew : took precautionary avoidance action none taken : insufficient time other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 1 vertical : 300 |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
While on the kokomo 1 arrival from clt out of FL240, cleared direct to bearz intersection and given 11000 ft. ATC requested 'no delay to 11000 ft.' level change was used and speed was 310 KTS, as also requested by ATC (ZAU 127.8). Prior to leveling off at 11000 ft, about 12-15 mi sse of bearz intersection we had a TA followed by an RA, to 'descend, descend.' the RA traffic was climbing and the RA was to descend, but at the same time ATC told us to stop descent. Our traffic was an air carrier following their own RA, due to VFR traffic at 9500 ft. (Captain gave center a phone call on ground.) the captain followed the RA for a few seconds and upon reaching 11000 ft we were 'clear of conflict.' the RA seemed conflicting, especially when ATC said 'stop descending.' however, RA was followed and never had to go below assigned altitude of 11000 ft.
Original NASA ASRS Text
Title: FLC OF A FOKKER 100 LEVELED OFF AT ASSIGNED ARR DSCNT ALT, OF WHICH HAPPENED TO COINCIDE WITH ARTCC CTLR'S DELAYED INSTRUCTIONS TO THEM TO STOP THEIR DSCNT AND THE ALL CLR GIVEN BY THEIR TCASII FOR WHICH THEY WERE RESPONDING.
Narrative: WHILE ON THE KOKOMO 1 ARR FROM CLT OUT OF FL240, CLRED DIRECT TO BEARZ INTXN AND GIVEN 11000 FT. ATC REQUESTED 'NO DELAY TO 11000 FT.' LEVEL CHANGE WAS USED AND SPD WAS 310 KTS, AS ALSO REQUESTED BY ATC (ZAU 127.8). PRIOR TO LEVELING OFF AT 11000 FT, ABOUT 12-15 MI SSE OF BEARZ INTXN WE HAD A TA FOLLOWED BY AN RA, TO 'DSND, DSND.' THE RA TFC WAS CLBING AND THE RA WAS TO DSND, BUT AT THE SAME TIME ATC TOLD US TO STOP DSCNT. OUR TFC WAS AN ACR FOLLOWING THEIR OWN RA, DUE TO VFR TFC AT 9500 FT. (CAPT GAVE CTR A PHONE CALL ON GND.) THE CAPT FOLLOWED THE RA FOR A FEW SECONDS AND UPON REACHING 11000 FT WE WERE 'CLR OF CONFLICT.' THE RA SEEMED CONFLICTING, ESPECIALLY WHEN ATC SAID 'STOP DSNDING.' HOWEVER, RA WAS FOLLOWED AND NEVER HAD TO GO BELOW ASSIGNED ALT OF 11000 FT.
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.