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Air carrier Y descent through occupied altitude had less than standard separation from air carrier X. System error.
| Attributes | |
| ACN | 250778 |
| Time | |
| Date | 199309 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : esl |
| State Reference | WV |
| Altitude | msl bound lower : 15000 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| 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 : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : radar |
| Experience | controller military : 4 controller non radar : 2 controller radar : 1 |
| ASRS Report | 250778 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| 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 : 3000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I just sat down on the d-side (radar associate position). I was looking over potential conflictions on later aircraft. The r-side saw the conflict alert activate between air carrier X and air carrier Y. R-side took action and climbed air carrier X to 16000 ft or 17000 ft. Air carrier X was already through 16000 ft with air carrier Y at 15600 ft, descending. Separation was restored. I had nothing to do with it nor did I take any action because I did not see the confliction.
Original NASA ASRS Text
Title: ACR Y DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR X. SYS ERROR.
Narrative: I JUST SAT DOWN ON THE D-SIDE (RADAR ASSOCIATE POS). I WAS LOOKING OVER POTENTIAL CONFLICTIONS ON LATER ACFT. THE R-SIDE SAW THE CONFLICT ALERT ACTIVATE BTWN ACR X AND ACR Y. R-SIDE TOOK ACTION AND CLBED ACR X TO 16000 FT OR 17000 FT. ACR X WAS ALREADY THROUGH 16000 FT WITH ACR Y AT 15600 FT, DSNDING. SEPARATION WAS RESTORED. I HAD NOTHING TO DO WITH IT NOR DID I TAKE ANY ACTION BECAUSE I DID NOT SEE THE CONFLICTION.
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.