Narrative:

Just prior to top of descent at fl 330 we experienced wake turbulence for 3-4 seconds. We went from smooth to light-mod turbulence according the ipad app. Seat belt sign was on. Flight attendants check-in PA was made and no injuries were reported. An aircraft was observed on TCAS 1;000 ft. Above us perpendicular to our course. ATC was advised.

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Original NASA ASRS Text

Title: B737NG flight crew reported encountering wake turbulence at FL330 in RJJJ airspace.

Narrative: Just prior to top of descent at FL 330 we experienced wake turbulence for 3-4 seconds. We went from smooth to light-mod turbulence according the iPad app. Seat belt sign was on. Flight attendants check-in PA was made and no injuries were reported. An aircraft was observed on TCAS 1;000 ft. above us perpendicular to our course. ATC was advised.

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.