Narrative:

We were cleared to FL340 and my copilot was pilot flying (PF). We started encountering turbulence and my copilot disconnected the autopilot for a smoother ride (a/P very sensitive to turbulence). Turbulence was occasional moderate. 1000 ft call was made and acknowledged by both crew at FL330. We received from ATC traffic advisory at FL350. We had the traffic on our TCAS (TCAS ii). We saw the traffic at 2-3 o'clock and passing behind us on our right wing. The traffic was not a factor. No TA or RA on TCAS. My first officer (first officer) started reducing pitch and pulling the throttle back to [max cruise thrust] mcr to level off at 340 and I saw a large ascent (updraft). My first officer corrected by pitching down using the electric elevator trim (low speed mode when pitching down); avoiding pulling negatives gs on the airframe. Using the electric trim was not quick enough and the aircraft kept climbing to 300 to 500 ft above FL340 to the point forward pressure input directly on the yoke and the aircraft finally settled down to FL340. The recovery from the event was smooth with no impact (gs) on anyone on board. In the meantime ATC called to tell us that we were deviating from assigned altitude. Shortly after; ATC cleared us to FL400 where the ride was much smoother. Updraft or wake turbulence from the crossing traffic at FL350. The encounter happened when the traffic was behind us.

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Original NASA ASRS Text

Title: LR60 Captain reported overshooting cleared altitude in climb to FL340 after encountering wake turbulence from a wide body transport aircraft.

Narrative: We were cleared to FL340 and my copilot was Pilot Flying (PF). We started encountering turbulence and my copilot disconnected the autopilot for a smoother ride (A/P very sensitive to turbulence). Turbulence was occasional moderate. 1000 ft call was made and acknowledged by both crew at FL330. We received from ATC traffic advisory at FL350. We had the traffic on our TCAS (TCAS II). We saw the traffic at 2-3 o'clock and passing behind us on our right wing. The traffic was not a factor. No TA or RA on TCAS. My First Officer (F/O) started reducing pitch and pulling the throttle back to [Max Cruise Thrust] MCR to level off at 340 and I saw a large ascent (updraft). My F/O corrected by pitching down using the electric elevator trim (low speed mode when pitching down); avoiding pulling negatives Gs on the airframe. Using the electric trim was not quick enough and the aircraft kept climbing to 300 to 500 ft above FL340 to the point forward pressure input directly on the yoke and the aircraft finally settled down to FL340. The recovery from the event was smooth with no impact (Gs) on anyone on board. In the meantime ATC called to tell us that we were deviating from assigned altitude. Shortly after; ATC cleared us to FL400 where the ride was much smoother. Updraft or wake turbulence from the crossing traffic at FL350. The encounter happened when the traffic was behind us.

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.