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ZID associate controller witnessed operational error at approximately FL210 as radar controller issued conflicting descent clearance.
| Attributes | |
| ACN | 680077 |
| Time | |
| Date | 200512 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : loz.vortac |
| State Reference | KY |
| Altitude | msl bound lower : 21000 msl bound upper : 22000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 170/175 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : personal |
| Make Model Name | Falcon 20G/20GF/ Mysterre Falcon 200 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 16 controller time certified in position1 : 16 |
| ASRS Report | 680077 |
| 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 | vertical : 600 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft Y northeast bound at FL210 looking for higher. Air carrier X at FL220 needing to descend into sdf. Radar controller cleared air carrier X to cross darby intersection at 11000 ft. Aircraft began descent immediately. Separation lost. Aircraft had both indicated they had each other in sight prior to the clearance and were going away from each other. At the time of the clearance; I was performing radar associate duties that required my attention to be focused away from the radar.
Original NASA ASRS Text
Title: ZID ASSOCIATE CTLR WITNESSED OPERROR AT APPROX FL210 AS RADAR CTLR ISSUED CONFLICTING DSCNT CLRNC.
Narrative: ACFT Y NE BOUND AT FL210 LOOKING FOR HIGHER. ACR X AT FL220 NEEDING TO DSND INTO SDF. RADAR CTLR CLRED ACR X TO CROSS DARBY INTXN AT 11000 FT. ACFT BEGAN DSCNT IMMEDIATELY. SEPARATION LOST. ACFT HAD BOTH INDICATED THEY HAD EACH OTHER IN SIGHT PRIOR TO THE CLRNC AND WERE GOING AWAY FROM EACH OTHER. AT THE TIME OF THE CLRNC; I WAS PERFORMING RADAR ASSOCIATE DUTIES THAT REQUIRED MY ATTN TO BE FOCUSED AWAY FROM THE RADAR.
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.