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ZOB controller experienced operational error at approximately FL320 during sequencing attempts for iad; failing to note confliction in another area of the sector.
| Attributes | |
| ACN | 818200 |
| Time | |
| Date | 200812 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pit.airport |
| State Reference | PA |
| Altitude | msl single value : 32000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.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 ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 0.6 |
| ASRS Report | 818200 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was spacing for the iad airport. Aircraft X; a B752/J; was inbound from the west; aircraft Y was inbound from the northwest -- both at FL330; and aircraft Z was an overflight at FL320 going westward. I assigned speeds (mach numbers) to aircraft X (mach .74) and aircraft Y (mach .74) to ensure aircraft X would stay behind. The ground speeds did not ensure their separation. The aircraft converged; so I descended aircraft Y to FL310 to ensure separation; without scanning the full area; putting aircraft Z in conflict with aircraft Y.
Original NASA ASRS Text
Title: ZOB controller experienced operational error at approximately FL320 during sequencing attempts for IAD; failing to note confliction in another area of the sector.
Narrative: I was spacing for the IAD Airport. Aircraft X; a B752/J; was inbound from the west; Aircraft Y was inbound from the northwest -- both at FL330; and Aircraft Z was an overflight at FL320 going westward. I assigned speeds (Mach numbers) to Aircraft X (Mach .74) and Aircraft Y (Mach .74) to ensure Aircraft X would stay behind. The ground speeds did not ensure their separation. The aircraft converged; so I descended Aircraft Y to FL310 to ensure separation; without scanning the full area; putting Aircraft Z in conflict with Aircraft Y.
Data retrieved from NASA's ASRS site as of May 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.