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Air carrier Y descent through occupied altitude had less than standard separation from air carrier X. System error.
| Attributes | |
| ACN | 211897 |
| Time | |
| Date | 199206 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pxv |
| State Reference | IN |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| 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 |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| 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 military : 5 controller radar : 2 |
| ASRS Report | 211897 |
| 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 : 1700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X at FL350 swbound over pxv. Air carrier Y at FL370 nebound approaching pxv. Reported turbulence and requested lower. Air carrier X was overlooked and air carrier Y was descended to FL330. When the conflict was noticed, air carrier Y was turned 30 degrees left and told of the traffic. Air carrier Y reported he had the aircraft on TCASII.
Original NASA ASRS Text
Title: ACR Y DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR X. SYS ERROR.
Narrative: ACR X AT FL350 SWBOUND OVER PXV. ACR Y AT FL370 NEBOUND APCHING PXV. RPTED TURB AND REQUESTED LOWER. ACR X WAS OVERLOOKED AND ACR Y WAS DSNDED TO FL330. WHEN THE CONFLICT WAS NOTICED, ACR Y WAS TURNED 30 DEGS L AND TOLD OF THE TFC. ACR Y RPTED HE HAD THE ACFT ON TCASII.
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.