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While attempting to resolve potential conflict, ARTCC controller causes loss of separation. Further and hurried attempts to rescue the incident with multiple clearance changes is aided by air carrier flight reporting intruder crafts visually and maintaining separation.
| Attributes | |
| ACN | 456151 |
| Time | |
| Date | 199911 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| State Reference | IA |
| Altitude | msl bound lower : 31000 msl bound upper : 37000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level cruise : enroute altitude change |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 12 |
| ASRS Report | 456151 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : far non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert |
| Resolutory Action | controller : issued advisory controller : issued new clearance controller : separated traffic |
| Miss Distance | horizontal : 7000 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Situations | |
| Airspace Structure | class a : zau.a |
Narrative:
Air carrier X was at FL370 eastbound to ord. Air carrier Y was at FL350 wbound. 2 aircraft both at FL310 were north of air carrier Y heading southwest. Descended the air carrier X to FL330 thinking the air carrier Y was at FL310. Answered 2 planes, shipped 2 more, then realized what I did. Tried to stop air carrier X at FL360. He reported seeing the traffic descended air carrier X through air carrier Y. Air carrier X was at FL370. Air carrier X was at FL350. Tried to stop air carrier X at FL360. Air carrier X reported seeing the traffic.
Original NASA ASRS Text
Title: WHILE ATTEMPTING TO RESOLVE POTENTIAL CONFLICT, ARTCC CTLR CAUSES LOSS OF SEPARATION. FURTHER AND HURRIED ATTEMPTS TO RESCUE THE INCIDENT WITH MULTIPLE CLRNC CHANGES IS AIDED BY ACR FLT RPTING INTRUDER CRAFTS VISUALLY AND MAINTAINING SEPARATION.
Narrative: ACR X WAS AT FL370 EBOUND TO ORD. ACR Y WAS AT FL350 WBOUND. 2 ACFT BOTH AT FL310 WERE N OF ACR Y HDG SW. DSNDED THE ACR X TO FL330 THINKING THE ACR Y WAS AT FL310. ANSWERED 2 PLANES, SHIPPED 2 MORE, THEN REALIZED WHAT I DID. TRIED TO STOP ACR X AT FL360. HE RPTED SEEING THE TFC DSNDED ACR X THROUGH ACR Y. ACR X WAS AT FL370. ACR X WAS AT FL350. TRIED TO STOP ACR X AT FL360. ACR X RPTED SEEING THE TFC.
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.