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Air carrier X descent through occupied altitude had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 243938 |
| Time | |
| Date | 199306 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fwa |
| State Reference | IN |
| Altitude | msl bound lower : 13000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute airway : zob |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| 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 : 11 controller radar : 8 |
| ASRS Report | 243938 |
| 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 other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was nebound at 15000 ft on same route and ahead of air carrier Y at 13000 ft. Due to converging traffic at 15000 ft and the importance, considering other traffic inbound to dtw, of having air carrier X cleared to 11000 ft, air carrier X was cleared to descend to 11000 ft. When air carrier X mode C showed 14000 ft, air carrier X was reclred to maintain 14000 ft. The aircraft descended below 14000 ft before leveling at 14000 ft. Air carrier Y was overtaking air carrier X was overlooked largely due to other conflicting traffic sits and the necessity of formulating an organization of the traffic flow into dtw with respect to several en route aircraft.
Original NASA ASRS Text
Title: ACR X DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: ACR X WAS NEBOUND AT 15000 FT ON SAME RTE AND AHEAD OF ACR Y AT 13000 FT. DUE TO CONVERGING TFC AT 15000 FT AND THE IMPORTANCE, CONSIDERING OTHER TFC INBOUND TO DTW, OF HAVING ACR X CLRED TO 11000 FT, ACR X WAS CLRED TO DSND TO 11000 FT. WHEN ACR X MODE C SHOWED 14000 FT, ACR X WAS RECLRED TO MAINTAIN 14000 FT. THE ACFT DSNDED BELOW 14000 FT BEFORE LEVELING AT 14000 FT. ACR Y WAS OVERTAKING ACR X WAS OVERLOOKED LARGELY DUE TO OTHER CONFLICTING TFC SITS AND THE NECESSITY OF FORMULATING AN ORGANIZATION OF THE TFC FLOW INTO DTW WITH RESPECT TO SEVERAL ENRTE ACFT.
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.