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Air carrier Y descent through occupied altitude had less than standard separation from air carrier X. System error.
| Attributes | |
| ACN | 275031 |
| Time | |
| Date | 199406 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : pmm |
| State Reference | MI |
| Altitude | msl bound lower : 8000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tower : mkk |
| 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 |
| Aircraft 2 | |
| 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 |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 2 |
| ASRS Report | 275031 |
| 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 |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
WX was in the area. Air carrier X was level at 8000 ft. Air carrier Y was level at 9000 ft requesting lower. I descended Y to 4000 ft forgetting about X. Conflict alert went off and I expedited Y through 7000 ft and turned him to a 030 degree heading. X was turned to a 170 degree heading. Y reported leaving 7000 ft and I cleared both aircraft on course. The sector was getting busy. I should have had an extra set of eyes watching the problem. I also should have double checked before descending Y.
Original NASA ASRS Text
Title: ACR Y DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR X. SYS ERROR.
Narrative: WX WAS IN THE AREA. ACR X WAS LEVEL AT 8000 FT. ACR Y WAS LEVEL AT 9000 FT REQUESTING LOWER. I DSNDED Y TO 4000 FT FORGETTING ABOUT X. CONFLICT ALERT WENT OFF AND I EXPEDITED Y THROUGH 7000 FT AND TURNED HIM TO A 030 DEG HDG. X WAS TURNED TO A 170 DEG HDG. Y RPTED LEAVING 7000 FT AND I CLRED BOTH ACFT ON COURSE. THE SECTOR WAS GETTING BUSY. I SHOULD HAVE HAD AN EXTRA SET OF EYES WATCHING THE PROB. I ALSO SHOULD HAVE DOUBLE CHKED BEFORE DSNDING Y.
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.