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Reporter's aircraft X responded to a TCASII alert, leveled aircraft off until clear of aircraft Y, then resumed descent. The crossing restr was not met because of this.
| Attributes | |
| ACN | 441710 |
| Time | |
| Date | 199906 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : jot.vortac |
| State Reference | IL |
| Altitude | msl bound lower : 7000 msl bound upper : 7500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | descent : vacating altitude descent : intermediate altitude |
| Route In Use | enroute airway : ns.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : c90.tracon |
| Make Model Name | PA-23-250 Turbo Aztec |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 280 flight time total : 26000 flight time type : 16000 |
| ASRS Report | 441710 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Miss Distance | horizontal : 5000 vertical : 1000 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Flight was in descent, oma-mdw, with a clearance given to cross 10 mi west of jot VOR at 6000 ft. The descent clearance was given late, so I was in the process of getting relief on the restr since we were high. Crossing +/-7000 ft, we got a TCASII TA and stopped the descent at 7000 ft. We advised ATC we were doing so and therefore would not make the crossing restr. The jump seater advised us the traffic passed under us less than 1 mi off to the right. He idented it as a white piper aztec. ATC only advised us of the traffic. Had we not stopped the descent we would have passed the traffic at the same altitude, and closer than 1 mi. At the time we were talking to chicago.
Original NASA ASRS Text
Title: RPTR'S ACFT X RESPONDED TO A TCASII ALERT, LEVELED ACFT OFF UNTIL CLR OF ACFT Y, THEN RESUMED DSCNT. THE XING RESTR WAS NOT MET BECAUSE OF THIS.
Narrative: FLT WAS IN DSCNT, OMA-MDW, WITH A CLRNC GIVEN TO CROSS 10 MI W OF JOT VOR AT 6000 FT. THE DSCNT CLRNC WAS GIVEN LATE, SO I WAS IN THE PROCESS OF GETTING RELIEF ON THE RESTR SINCE WE WERE HIGH. XING +/-7000 FT, WE GOT A TCASII TA AND STOPPED THE DSCNT AT 7000 FT. WE ADVISED ATC WE WERE DOING SO AND THEREFORE WOULD NOT MAKE THE XING RESTR. THE JUMP SEATER ADVISED US THE TFC PASSED UNDER US LESS THAN 1 MI OFF TO THE R. HE IDENTED IT AS A WHITE PIPER AZTEC. ATC ONLY ADVISED US OF THE TFC. HAD WE NOT STOPPED THE DSCNT WE WOULD HAVE PASSED THE TFC AT THE SAME ALT, AND CLOSER THAN 1 MI. AT THE TIME WE WERE TALKING TO CHICAGO.
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.