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After ARTCC controller had issued descent instructions to an air carrier canadair regional jet and a cpr citation 550 believing that their clrncs would provide legal separation, conflict alert went off. The CL65 had descended much slower than expected causing the potential conflict.
| Attributes | |
| ACN | 470988 |
| Time | |
| Date | 200004 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : sbv.vortac |
| State Reference | VA |
| Altitude | msl bound lower : 19000 msl bound upper : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65, Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Citation II S2/Bravo |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other vortac |
| Flight Phase | descent : vacating altitude descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 17 |
| ASRS Report | 470988 |
| 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 |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | none taken : detected after the fact |
| Miss Distance | horizontal : 12200 vertical : 400 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Very busy. Complex feeds into rbv with other traffic and crossing traffic. I descended the air carrier to 17000 ft and had given to private jet a crossing restr at FL190. I thought they would be separated. I got busy with other things, especially inputs on our dsr equipment, and then noticed the aircraft was slow to descend and conflict alert activated. At this point, I asked the air carrier aircraft to expedite, but he couldn't do it in time. I believe that the failure of the air carrier aircraft to descend at a standard rate of descent, not being used to new equipment, and high traffic volume/complexity were the 3 factors that led to this occurrence.
Original NASA ASRS Text
Title: AFTER ARTCC CTLR HAD ISSUED DSCNT INSTRUCTIONS TO AN ACR CANADAIR REGIONAL JET AND A CPR CITATION 550 BELIEVING THAT THEIR CLRNCS WOULD PROVIDE LEGAL SEPARATION, CONFLICT ALERT WENT OFF. THE CL65 HAD DSNDED MUCH SLOWER THAN EXPECTED CAUSING THE POTENTIAL CONFLICT.
Narrative: VERY BUSY. COMPLEX FEEDS INTO RBV WITH OTHER TFC AND XING TFC. I DSNDED THE ACR TO 17000 FT AND HAD GIVEN TO PVT JET A XING RESTR AT FL190. I THOUGHT THEY WOULD BE SEPARATED. I GOT BUSY WITH OTHER THINGS, ESPECIALLY INPUTS ON OUR DSR EQUIP, AND THEN NOTICED THE ACFT WAS SLOW TO DSND AND CONFLICT ALERT ACTIVATED. AT THIS POINT, I ASKED THE ACR ACFT TO EXPEDITE, BUT HE COULDN'T DO IT IN TIME. I BELIEVE THAT THE FAILURE OF THE ACR ACFT TO DSND AT A STANDARD RATE OF DSCNT, NOT BEING USED TO NEW EQUIP, AND HIGH TFC VOLUME/COMPLEXITY WERE THE 3 FACTORS THAT LED TO THIS OCCURRENCE.
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.