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ZDC controller experienced operational error at 16000 with opposite direction traffic when descending traffic with icing problems through occupied altitude.
| Attributes | |
| ACN | 724117 |
| Time | |
| Date | 200701 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : sawed |
| State Reference | VA |
| Altitude | msl single value : 16000 |
| Environment | |
| Weather Elements | Ice |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 15 controller time certified in position1 : 6 |
| ASRS Report | 724117 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27000 vertical : 200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft at 17000 reported icing and requested descent to 11000. Aircraft #1 was issued 11000 and descended through altitudes of aircraft #2 sbound at 16000. Rtes of flight were opposite direction; but offset by several mi.
Original NASA ASRS Text
Title: ZDC CTLR EXPERIENCED OPERROR AT 16000 WITH OPPOSITE DIRECTION TFC WHEN DESCENDING TFC WITH ICING PROBLEMS THROUGH OCCUPIED ALT.
Narrative: ACFT AT 17000 RPTED ICING AND REQUESTED DSCNT TO 11000. ACFT #1 WAS ISSUED 11000 AND DSNDED THROUGH ALTS OF ACFT #2 SBOUND AT 16000. RTES OF FLT WERE OPPOSITE DIRECTION; BUT OFFSET BY SEVERAL MI.
Data retrieved from NASA's ASRS site as of January 2009 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.