PC-12
Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 200; Flight Crew Total 4900; Flight Crew Type 3800
Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Weather / Turbulence
Flight Crew Regained Aircraft Control
Weather
Encountered severe turbulence at FL190-220. 90 degree bank angles noted. ATC specifically mentioned greater than 300 feet deviations in either direction. Control of the aircraft was barely possible; items thrown around the cockpit. A box was up-ended and debris scattered throughout the airplane. No personal injury noted. No obvious damage to the aircraft was noted. Weather conditions worsened after departure with convection noted south of the area. No previous reports of turbulence to ATC more severe than moderate turbulence.
The pilot of a PC-12 reported an encounter with severe turbulence with 90 degree variations in bank angle and 300 foot altitude deviations.