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Air carrier X descent through occupied altitude had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 299884 |
| Time | |
| Date | 199503 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pmm |
| State Reference | MI |
| Altitude | msl bound lower : 29000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 1 controller radar : 1 |
| ASRS Report | 299884 |
| 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 | atc equipment other atc equipment : unspecified |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 1500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Intra Facility Coordination Failure Operational Error |
Narrative:
Air carrier X was swbound descending to FL280. Air carrier Y was sebound at FL290. The altitude in the data block of air carrier X was FL310 due to a previous clearance. I was unable to update the data block due to an interfacility handoff being accepted. When air carrier X left FL310, the conflict alert feature activated. I turned air carrier X to a north heading and cleared him back to FL310.
Original NASA ASRS Text
Title: ACR X DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: ACR X WAS SWBOUND DSNDING TO FL280. ACR Y WAS SEBOUND AT FL290. THE ALT IN THE DATA BLOCK OF ACR X WAS FL310 DUE TO A PREVIOUS CLRNC. I WAS UNABLE TO UPDATE THE DATA BLOCK DUE TO AN INTERFAC HDOF BEING ACCEPTED. WHEN ACR X LEFT FL310, THE CONFLICT ALERT FEATURE ACTIVATED. I TURNED ACR X TO A N HDG AND CLRED HIM BACK TO FL310.
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.