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ZID controller experienced operational error at FL240 when coordination from the d-side was incorrect and/or confused and the wrong aircraft was descended.
| Attributes | |
| ACN | 806578 |
| Time | |
| Date | 200809 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : okk.vor |
| State Reference | IN |
| Altitude | msl single value : 24000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Thunderstorm |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B717 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 5 controller radar : 7 |
| ASRS Report | 806578 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 22200 vertical : 200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
While working the radar position; I had coordinated with ZAU ARTCC to descend aircraft X to FL240 immediately clearing traffic. Within 30 seconds of that coordination; my d-side (assistant) took a call from ZAU ARTCC to change the plan to stop aircraft X at FL260. My d-side then told me to 'stop that aircraft at FL260.' the wrong aircraft was stopped and aircraft X descended to FL240 and eventually creating an operational error with a crj that was climbing the opposite direction. Both aircraft responded to TCAS advisories.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT FL240 WHEN COORD FROM THE D-SIDE WAS INCORRECT AND/OR CONFUSED AND THE WRONG ACFT WAS DESCENDED.
Narrative: WHILE WORKING THE RADAR POS; I HAD COORDINATED WITH ZAU ARTCC TO DSND ACFT X TO FL240 IMMEDIATELY CLRING TFC. WITHIN 30 SECONDS OF THAT COORD; MY D-SIDE (ASSISTANT) TOOK A CALL FROM ZAU ARTCC TO CHANGE THE PLAN TO STOP ACFT X AT FL260. MY D-SIDE THEN TOLD ME TO 'STOP THAT ACFT AT FL260.' THE WRONG ACFT WAS STOPPED AND ACFT X DSNDED TO FL240 AND EVENTUALLY CREATING AN OPERROR WITH A CRJ THAT WAS CLBING THE OPPOSITE DIRECTION. BOTH ACFT RESPONDED TO TCAS ADVISORIES.
Data retrieved from NASA's ASRS site as of May 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.