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ZID ARTCC radar controller working converging traffic near rod believed lateral separation would exist and started the higher aircraft down resulting in an operational error.
| Attributes | |
| ACN | 632566 |
| Time | |
| Date | 200410 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : rod.vortac |
| State Reference | OH |
| Altitude | msl single value : 22000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65, Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65, Undifferentiated or Other Model |
| 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 limited radar : 5 controller military : 5 controller non radar : 1 controller radar : 1 |
| ASRS Report | 632566 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller limited radar : 3 controller non radar : 4 controller radar : 15 flight time total : 130 |
| ASRS Report | 632564 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar/mode c other controllera other controllerb |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27600 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier #2 was level at FL220. Air carrier #1 was at FL230 sebound. Air carrier #1 was northbound. The radar controller thought air carrier #2 was behind air carrier #1 when he descended air carrier #1 from FL230 to FL200. Supplemental information from acn 632564: I descended air carrier #1 through air carrier #2, believing that I would have lateral separation the whole time. When I realized that I didn't have it, I issued turns and expedited the descent, followed by a request for a report.
Original NASA ASRS Text
Title: ZID ARTCC RADAR CTLR WORKING CONVERGING TFC NEAR ROD BELIEVED LATERAL SEPARATION WOULD EXIST AND STARTED THE HIGHER ACFT DOWN RESULTING IN AN OPERROR.
Narrative: ACR #2 WAS LEVEL AT FL220. ACR #1 WAS AT FL230 SEBOUND. ACR #1 WAS NBOUND. THE RADAR CTLR THOUGHT ACR #2 WAS BEHIND ACR #1 WHEN HE DSNDED ACR #1 FROM FL230 TO FL200. SUPPLEMENTAL INFO FROM ACN 632564: I DSNDED ACR #1 THROUGH ACR #2, BELIEVING THAT I WOULD HAVE LATERAL SEPARATION THE WHOLE TIME. WHEN I REALIZED THAT I DIDN'T HAVE IT, I ISSUED TURNS AND EXPEDITED THE DSCNT, FOLLOWED BY A REQUEST FOR A RPT.
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.