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ZOB controller described operational error at FL240 when an adjacent controller failed to coordination prior to initiating descent.
| Attributes | |
| ACN | 729218 |
| Time | |
| Date | 200702 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dtw.airport |
| State Reference | MI |
| Altitude | msl single value : 24000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Citationjet C525/C526 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar controller : handoff position |
| Qualification | controller : radar |
| Experience | controller radar : 19 |
| ASRS Report | 729218 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 37600 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X was climbing to FL230 awaiting higher. A pointout was issued with data block showing interim FL270. Traffic was a factor and acknowledged. Aircraft X leveled at FL230. Air carrier Y was at FL240 awaiting descent into cle. A third controller thought aircraft X was climbing and dumped air carrier Y through the aircraft X. Controller did not ask the sector above what was going on with the aircraft and thought they were avoiding a conflict by descending air carrier Y to FL200. Had the third party followed procedure by calling the previous sector all could have been avoided.
Original NASA ASRS Text
Title: ZOB CTLR DESCRIBED OPERROR AT FL240 WHEN AN ADJACENT CTLR FAILED TO COORD PRIOR TO INITIATING DSCNT.
Narrative: ACFT X WAS CLBING TO FL230 AWAITING HIGHER. A POINTOUT WAS ISSUED WITH DATA BLOCK SHOWING INTERIM FL270. TFC WAS A FACTOR AND ACKNOWLEDGED. ACFT X LEVELED AT FL230. ACR Y WAS AT FL240 AWAITING DSCNT INTO CLE. A THIRD CTLR THOUGHT ACFT X WAS CLBING AND DUMPED ACR Y THROUGH THE ACFT X. CTLR DID NOT ASK THE SECTOR ABOVE WHAT WAS GOING ON WITH THE ACFT AND THOUGHT THEY WERE AVOIDING A CONFLICT BY DSNDING ACR Y TO FL200. HAD THE THIRD PARTY FOLLOWED PROC BY CALLING THE PREVIOUS SECTOR ALL COULD HAVE BEEN AVOIDED.
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.