Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 205
Inflight Event / Encounter Wake Vortex Encounter
General Physical Injury / Incapacitation
Environment - Non Weather Related; Procedure
While at 34;000 FT MSL in clear air; we experienced a strong jolt of turbulence that spilled drinks in cabin/galley. Seat belt sign was off - no turbulence reported or indicated in our paperwork. We had just passed another [air] carrier aircraft going opposite direction 1;000 FT above us approximately three miles to our east. (Possible wake turbulence). We asked flight attendants (F/A) if they were ok; they said no one was hurt; but after flight; one F/A said she had bumped her shoulder in the galley.
B737 First Officer reported a 'strong jolt' of wake turbulence at FL340 when they passed another aircraft going in the opposite direction at FL350.