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ZID controller experienced operational error at FL220 when descending aircraft through occupied altitude.
| Attributes | |
| ACN | 714463 |
| Time | |
| Date | 200610 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zid.artcc |
| State Reference | IN |
| Altitude | msl single value : 22000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Learjet 31 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating 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 radar : 3.5 |
| ASRS Report | 714463 |
| 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 | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 15360 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft Z called off of 7k4 VFR wanting an IFR clearance. I found his flight plan in uret and called evv approach to issue departure message. Air carrier X called on descending to FL240. I cleared him to descend and maintain FL200 (the LOA altitude for bna arrs to bwg lo). After seeing aircraft separation was compromised I turned air carrier X 30 degrees left and air carrier Y 50 degrees left. Aircraft Z required off line communication which took my attention away from the traffic on the scope. I was aware air carrier Y was traffic and cleared air carrier X to FL200 as per LOA thinking I had cleared him to FL230.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT FL220 WHEN DSNDING ACFT THROUGH OCCUPIED ALT.
Narrative: ACFT Z CALLED OFF OF 7K4 VFR WANTING AN IFR CLRNC. I FOUND HIS FLT PLAN IN URET AND CALLED EVV APCH TO ISSUE DEP MESSAGE. ACR X CALLED ON DSNDING TO FL240. I CLRED HIM TO DSND AND MAINTAIN FL200 (THE LOA ALT FOR BNA ARRS TO BWG LO). AFTER SEEING ACFT SEPARATION WAS COMPROMISED I TURNED ACR X 30 DEGS L AND ACR Y 50 DEGS L. ACFT Z REQUIRED OFF LINE COM WHICH TOOK MY ATTN AWAY FROM THE TFC ON THE SCOPE. I WAS AWARE ACR Y WAS TFC AND CLRED ACR X TO FL200 AS PER LOA THINKING I HAD CLRED HIM TO FL230.
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.