B767 flight crew reported encountering what ATC surmised as wake turbulence at FL315 that resulted in an injury to a Flight Attendant.
Synopsis
B767 flight crew reported encountering what ATC surmised as wake turbulence at FL315 that resulted in an injury to a Flight Attendant.
Narrative
During the climb we had been given a heading to fly for separation as well as an altitude lower than we were filed. (Filed at FL340; about to level FL320). Just prior to leveling off we had a momentary moderate turbulence with no previous light or moderate in that vicinity. The event lasted less than 10 seconds; during which the Captain/PM made the PA announcement; Flight attendants be seated immediately; be seated immediately." The turbulence stopped and we reported it to ATC. ATC surmised that it may have been wake turbulence from another aircraft that had previously crossed our path; which we weren't able to see due to being in IMC. After a few minutes without turbulence the Captain made the PA; "Flight attendants; take your jumpseats." After a few more minutes of no turbulence; Captain made the PA; "Flight attendants check in." When the Purser called the flight deck she reported that one Flight Attendant (FA) had hurt her knee in the turbulence; was able to continue working but would be filing a report. The flight continued without any further turbulence incidents."
Second reporter narrative
London Control gave us a climb clearance from 300 to 320. While leveling off at 320 encountered moderate turbulence. Informed London and they said possible wake from plane that just passed over us. On FA check-in Purser reported everyone was ok. A few minutes later FA from aft galley called and informed us that she went down on her knee was ok to continue but was filing a report. Moderate turbulence lasted for under 5 seconds.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.