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ZSE ARTCC controller reported approach handed off an aircraft into a traffic conflict with a nonparticipant aircraft within center's airspace.
| Attributes | |
| ACN | 1641477 |
| Time | |
| Date | 201904 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZSE.ARTCC |
| State Reference | WA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Large Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Route In Use | Direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Flight Plan | VFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 6 |
| Events | |
| Anomaly | ATC Issue All Types Conflict NMAC |
Narrative:
Took a handoff on [aircraft X] from S46. Traffic volume was steady but normal. In my scan I saw conflicting VFR traffic for [aircraft X] at 11;500 feet (unverified). I expected S46 to stop [aircraft X] under the VFR traffic and wait for them to pass before shipping them to me; they did not. [Aircraft X] checked on around 10;000 and my first transmission was to stop their climb immediately and I gave them traffic. I did not use proper phraseology in fear of time constraints. I gave [aircraft X] traffic again and he reported them in sight. I cleared [aircraft X] to climb at pilot discretion once I saw targets pass. In my career this is the closest I've seen two airplanes come nose to nose in an uncontrolled manner. The likelihood of collision in my opinion was severe.raise the top of the bravo airspace to 150. There is no reason a VFR [aircraft] should fly uncontrolled through the top of highly congested airspace and not talk to a controller.
Original NASA ASRS Text
Title: ZSE ARTCC Controller reported Approach handed off an aircraft into a traffic conflict with a nonparticipant aircraft within Center's airspace.
Narrative: Took a handoff on [Aircraft X] from S46. Traffic volume was steady but normal. In my scan I saw conflicting VFR traffic for [Aircraft X] at 11;500 feet (unverified). I expected S46 to stop [Aircraft X] under the VFR traffic and wait for them to pass before shipping them to me; they did not. [Aircraft X] checked on around 10;000 and my first transmission was to stop their climb immediately and I gave them traffic. I did not use proper phraseology in fear of time constraints. I gave [Aircraft X] traffic again and he reported them in sight. I cleared [Aircraft X] to climb at pilot discretion once I saw targets pass. In my career this is the closest I've seen two airplanes come nose to nose in an uncontrolled manner. The likelihood of collision in my opinion was severe.Raise the top of the bravo airspace to 150. There is no reason a VFR [aircraft] should fly uncontrolled through the top of highly congested airspace and not talk to a controller.
Data retrieved from NASA's ASRS site 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.