Medium Transport
Flight Crew Air Transport Pilot (ATP)
Inflight Event / Encounter Wake Vortex Encounter; Inflight Event / Encounter Loss Of Aircraft Control
Air Traffic Control Issued New Clearance; Flight Crew Regained Aircraft Control
Environment - Non Weather Related
I am writing this report to document an enroute wake turbulence encounter that occurred [enroute] to ATL. We were enroute in relatively clear; calm; VFR weather somewhere near the BNA VORTAC in cruise flight at FL330. The winds aloft were very light; a very slight headwind. The CA (PF) had me request FL350 from ATC and I complied. Shortly after that; the CA went off the radio to brief the passengers and turn off the seatbelt sign; and I took the controls and radios. We received our clearance to climb to FL350; and I began our gradual climb. ATC then notified us that we were following a B747 seven miles ahead at FL350. The CA completed his briefing; and I returned the controls to him; also briefing him on the wake turbulence advisory and location of the B747. Just about our climbing through FL340; we began to feel the first indications of wake turbulence. About a second or two later; we hit the full wake turbulence effects; with our a/c rolling about 45 degrees (my estimate) first to the right; and then to the left. The CA soon regained control; and we both concurred that we should go back down to FL330. I requested that from ATC; advising them that we did hit the wake of the B747. We immediately got cleared and returned to FL330. The CA shortly thereafter checked on the flight attendants; and then briefed the passengers on what had happened. Nobody seemed to be injured or upset.
Medium Transport First Officer reported wake vortex encounter at FL350 in trail of a B747; causing a 45 degree roll to the right and then the left.