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Aircraft Y descent through occupied altitude had less than standard separation from air carrier X. System error. TCASII TA.
| Attributes | |
| ACN | 191900 |
| Time | |
| Date | 199110 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : eck |
| State Reference | MI |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 9000 flight time type : 500 |
| ASRS Report | 191900 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was level at 310. We got a TCASII alert showing traffic opposite direction 12 O'clock at 1000 ft below us descending. Center asked the other aircraft Y to expedite descent, and asked us to begin an immediate climb to 330. We passed with 2000 ft separation, and we had climbed 31.5 when the controller cleared us back to 310. Once the TCASII alerted us we had aircraft Y in sight the entire time.
Original NASA ASRS Text
Title: ACFT Y DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR X. SYS ERROR. TCASII TA.
Narrative: ACR X WAS LEVEL AT 310. WE GOT A TCASII ALERT SHOWING TFC OPPOSITE DIRECTION 12 O'CLOCK AT 1000 FT BELOW US DSNDING. CENTER ASKED THE OTHER ACFT Y TO EXPEDITE DSCNT, AND ASKED US TO BEGIN AN IMMEDIATE CLB TO 330. WE PASSED WITH 2000 FT SEPARATION, AND WE HAD CLBED 31.5 WHEN THE CTLR CLRED US BACK TO 310. ONCE THE TCASII ALERTED US WE HAD ACFT Y IN SIGHT THE ENTIRE TIME.
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.