Narrative:

Upon visual approach to pae noticed a B787 climbing through our altitude approximately three miles in front of us and to our right with lateral separation at approximately 3;000 ft. The B787 was moving opposite to our direction (we were southbound and it was northbound). There was no collision risk. Approximately 90-120 seconds after the B787 passed our right wing; we felt a small bump; followed by a rapid and abrupt uncommanded roll to the left - about 40-45 degrees. The upset was easily recovered. The other pilot in the aircraft (a CFI) and I immediately identified the cause to be wake turbulence from the B787. We were surprised that the wake drifted as far as it did from the track of the aircraft; especially since winds aloft seemed to be moving south to north.

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Original NASA ASRS Text

Title: Cessna 172 pilot reported encountering wake turbulence from an opposite direction B787 in SEA airspace.

Narrative: Upon visual approach to PAE noticed a B787 climbing through our altitude approximately three miles in front of us and to our right with lateral separation at approximately 3;000 ft. The B787 was moving opposite to our direction (we were southbound and it was northbound). There was no collision risk. Approximately 90-120 seconds after the B787 passed our right wing; we felt a small bump; followed by a rapid and abrupt uncommanded roll to the left - about 40-45 degrees. The upset was easily recovered. The other pilot in the aircraft (a CFI) and I immediately identified the cause to be wake turbulence from the B787. We were surprised that the wake drifted as far as it did from the track of the aircraft; especially since winds aloft seemed to be moving south to north.

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.