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Air carrier X descent through occupied altitude, had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 260975 |
| Time | |
| Date | 199401 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fak |
| State Reference | VA |
| Altitude | msl bound lower : 24000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc tower : grb |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| 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 radar : 18 |
| ASRS Report | 260975 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27000 vertical : 800 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was at FL250. Cpr Y was at FL240. Cpr aircraft was wbound and air carrier X was nebound. Air carrier X was descended through cpr Y. I attempted a radar vector and expeditious descent but it didn't work.
Original NASA ASRS Text
Title: ACR X DSCNT THROUGH OCCUPIED ALT, HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: ACR X WAS AT FL250. CPR Y WAS AT FL240. CPR ACFT WAS WBOUND AND ACR X WAS NEBOUND. ACR X WAS DSNDED THROUGH CPR Y. I ATTEMPTED A RADAR VECTOR AND EXPEDITIOUS DSCNT BUT IT DIDN'T WORK.
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.