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ZKC controller experienced operational error at FL380 as descent clearance was issued through occupied altitude.
| Attributes | |
| ACN | 681923 |
| Time | |
| Date | 200512 |
| Place | |
| Locale Reference | navaid : enl.vortac |
| State Reference | IL |
| Altitude | msl single value : 38000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zkc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger Jet Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : n/s |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 681923 |
| 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 flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The CL60 was descended through the B737. The clutter of data blocks on the display partially obstructed the view of the B737. Radar vectors were issued but not in time to prevent loss of ATC separation.
Original NASA ASRS Text
Title: ZKC CTLR EXPERIENCED OPERROR AT FL380 AS DSCNT CLRNC WAS ISSUED THROUGH OCCUPIED ALT.
Narrative: THE CL60 WAS DSNDED THROUGH THE B737. THE CLUTTER OF DATA BLOCKS ON THE DISPLAY PARTIALLY OBSTRUCTED THE VIEW OF THE B737. RADAR VECTORS WERE ISSUED BUT NOT IN TIME TO PREVENT LOSS OF ATC SEPARATION.
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.