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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier Y descent through occupied altitude had less than standard separation from air carrier. System error.
| Attributes | |
| ACN | 234407 |
| Time | |
| Date | 199302 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zdc |
| State Reference | DC |
| Altitude | msl bound lower : 33000 msl bound upper : 34200 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc tower : bos |
| 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 |
| ASRS Report | 234407 |
| 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 | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 0 vertical : 1200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Airports for jfk, isp, and hpn were closed due to WX. Flts for those associated airports were being placed in hold with some aircraft diverting to alternates. Air carrier X was northbound at FL330 with air carrier Y sbound at FL350. Air carrier Y needed to descend to FL190 to transition to dca. I gave an initial descent to FL280 to air carrier Y. Upon realizing the conflict, I stopped air carrier Y at his present altitude and issued a turn.
Original NASA ASRS Text
Title: ACR Y DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR. SYS ERROR.
Narrative: ARPTS FOR JFK, ISP, AND HPN WERE CLOSED DUE TO WX. FLTS FOR THOSE ASSOCIATED ARPTS WERE BEING PLACED IN HOLD WITH SOME ACFT DIVERTING TO ALTERNATES. ACR X WAS NBOUND AT FL330 WITH ACR Y SBOUND AT FL350. ACR Y NEEDED TO DSND TO FL190 TO TRANSITION TO DCA. I GAVE AN INITIAL DSCNT TO FL280 TO ACR Y. UPON REALIZING THE CONFLICT, I STOPPED ACR Y AT HIS PRESENT ALT AND ISSUED A TURN.
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.