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ZID controller experienced loss of separation with 2 en route aircraft, one descending to FL345 before error was recognized.
| Attributes | |
| ACN | 606125 |
| Time | |
| Date | 200401 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : rod.vortac |
| State Reference | OH |
| Altitude | msl bound lower : 34500 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Turbulence |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 200 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 : 5 controller time certified in position1 : 5 |
| ASRS Report | 606125 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 21000 vertical : 1500 |
| Supplementary | |
| Problem Areas | Environmental Factor ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Moderate to heavy traffic prior to event. Couple sets of aircraft on vectors. Took handoff aircraft X to ind. Data block of aircraft X was initially covered. I knew aircraft X was ind arrival, and I initially thought was at FL310. I flashed aircraft X to sector 88 to descend. I thought sector 88 had a handoff. I was ready to switch, and I noticed aircraft X was at FL350. In my mind, aircraft X was clear. I descended to FL310, and switched to sector 88. I saw traffic after I had sector 88 turn and climb aircraft to avoid situation. Turns not enough to avoid loss of horizontal separation.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED LOSS OF SEPARATION WITH 2 ENRTE ACFT, ONE DSNDING TO FL345 BEFORE ERROR WAS RECOGNIZED.
Narrative: MODERATE TO HVY TFC PRIOR TO EVENT. COUPLE SETS OF ACFT ON VECTORS. TOOK HDOF ACFT X TO IND. DATA BLOCK OF ACFT X WAS INITIALLY COVERED. I KNEW ACFT X WAS IND ARR, AND I INITIALLY THOUGHT WAS AT FL310. I FLASHED ACFT X TO SECTOR 88 TO DSND. I THOUGHT SECTOR 88 HAD A HDOF. I WAS READY TO SWITCH, AND I NOTICED ACFT X WAS AT FL350. IN MY MIND, ACFT X WAS CLR. I DSNDED TO FL310, AND SWITCHED TO SECTOR 88. I SAW TFC AFTER I HAD SECTOR 88 TURN AND CLB ACFT TO AVOID SIT. TURNS NOT ENOUGH TO AVOID LOSS OF HORIZ SEPARATION.
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.