Narrative:

We departed [bfi] on the NRVNA1 departure procedure. Shortly after takeoff; climbing through approx. 400 feet and in navigation mode; the pilot monitoring (pm) had visual contact with a light VFR aircraft on a merging flight path with our flight path. We were then told by tower we had traffic; 2 aircraft. The pm asked me for an immediate right turn to avoid the traffic; in the turn we received a traffic alert. I came further right and continued the climb towards 2000 feet. We were then handed off to seattle center; [and] after switching frequency; [center] was calling us. The pilot monitoring (pm) explained we had deviated right of course on the departure due to the proximity of the other aircraft and we were correcting back to the nrvna departure course. Center mentioned to us they had received a collision alert on us and this prompted some back forth with departure and then center who were looking for some clarification from us on what had occurred while departing bfi. I would like to add the encounter with the other aircraft was witnessed from the cabin by our flight attendant who was able to identify the color of both aircraft as we passed by them. We continued on course with no further issues.aircraft are too close to each other on the parallel runways. Potential for collision and/or wake turbulence is unacceptably high. Closure rate for jet aircraft on light GA VFR aircraft limits reaction time considerably.

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Original NASA ASRS Text

Title: CL-650 flight crew reported an airborne conflict shortly after takeoff from BFI with a light aircraft departing from a parallel runway.

Narrative: We departed [BFI] on the NRVNA1 departure procedure. Shortly after takeoff; climbing through approx. 400 feet and in NAV mode; the Pilot Monitoring (PM) had visual contact with a light VFR aircraft on a merging flight path with our flight path. We were then told by Tower we had traffic; 2 aircraft. The PM asked me for an immediate right turn to avoid the traffic; in the turn we received a Traffic Alert. I came further right and continued the climb towards 2000 feet. We were then handed off to Seattle Center; [and] after switching frequency; [Center] was calling us. The Pilot Monitoring (PM) explained we had deviated right of course on the departure due to the proximity of the other aircraft and we were correcting back to the NRVNA departure course. Center mentioned to us they had received a collision alert on us and this prompted some back forth with Departure and then Center who were looking for some clarification from us on what had occurred while departing BFI. I would like to add the encounter with the other aircraft was witnessed from the cabin by our flight attendant who was able to identify the color of both aircraft as we passed by them. We continued on course with no further issues.Aircraft are too close to each other on the parallel runways. Potential for collision and/or wake turbulence is unacceptably high. Closure rate for jet aircraft on light GA VFR aircraft limits reaction time considerably.

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.