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ARTCC radar controller descended an air carrier B727 through the altitude of an air carrier L1011 with less than standard separation.
| Attributes | |
| ACN | 354837 |
| Time | |
| Date | 199612 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zzz |
| State Reference | US |
| Altitude | msl bound lower : 28400 msl bound upper : 29000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011 Tri-Star All Series |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 22 |
| ASRS Report | 354837 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 6 |
| ASRS Report | 355319 |
| 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 | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 17400 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was nebound at FL290. Air carrier Y was northbound at FL310. I descended air carrier Y to FL280 and separation was lost with air carrier X. Supplemental information from acn 355319: B727 was cleared to descend from FL310 to FL280. L1011 was under at FL290. Loss of separation was 2.9 mi and 600 ft.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR DSNDED AN ACR B727 THROUGH THE ALT OF AN ACR L1011 WITH LTSS.
Narrative: ACR X WAS NEBOUND AT FL290. ACR Y WAS NBOUND AT FL310. I DSNDED ACR Y TO FL280 AND SEPARATION WAS LOST WITH ACR X. SUPPLEMENTAL INFO FROM ACN 355319: B727 WAS CLRED TO DSND FROM FL310 TO FL280. L1011 WAS UNDER AT FL290. LOSS OF SEPARATION WAS 2.9 MI AND 600 FT.
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.