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ZID controller experienced operational error at FL370 when failing to observe conflicting traffic during a descent clearance.
| Attributes | |
| ACN | 722100 |
| Time | |
| Date | 200612 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : loz.vortac |
| State Reference | IN |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Beechjet 400 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 24 controller time certified in position1 : 21 controller time certified in position2 : 3 |
| ASRS Report | 722100 |
| Person 2 | |
| Affiliation | company : corporate |
| 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 | horizontal : 25200 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 did not automatically handoff to ZTL; so I initiated a handoff which failed. The d-side called to make a manual handoff and in the meantime I descended aircraft #2 from FL380-FL340. I simply overlooked (missed) that they were traffic for each other. When conflict alert went off they were already past each other and situation was not correctable.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT FL370 WHEN FAILING TO OBSERVE CONFLICTING TFC DURING A DSCNT CLRNC.
Narrative: ACFT #1 DID NOT AUTOMATICALLY HDOF TO ZTL; SO I INITIATED A HDOF WHICH FAILED. THE D-SIDE CALLED TO MAKE A MANUAL HDOF AND IN THE MEANTIME I DSNDED ACFT #2 FROM FL380-FL340. I SIMPLY OVERLOOKED (MISSED) THAT THEY WERE TFC FOR EACH OTHER. WHEN CONFLICT ALERT WENT OFF THEY WERE ALREADY PAST EACH OTHER AND SITUATION WAS NOT CORRECTABLE.
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.