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ARTCC controller failed to maintain legal separation when he descended a B737 through the cruising altitude of a DC9.
| Attributes | |
| ACN | 458350 |
| Time | |
| Date | 199912 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : hvq.vor |
| State Reference | WV |
| Altitude | msl bound lower : 27000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 12 controller radar : 5 |
| ASRS Report | 458350 |
| 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 other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated Other |
| Miss Distance | horizontal : 29000 vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Descended B737 from FL330 to FL270. At FL310 was a nwbound DC9. Should have turned and then descended B737.
Original NASA ASRS Text
Title: ARTCC CTLR FAILED TO MAINTAIN LEGAL SEPARATION WHEN HE DSNDED A B737 THROUGH THE CRUISING ALT OF A DC9.
Narrative: DSNDED B737 FROM FL330 TO FL270. AT FL310 WAS A NWBOUND DC9. SHOULD HAVE TURNED AND THEN DSNDED B737.
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.