Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 80; Flight Crew Total 3200; Flight Crew Type 1000
Deviation - Altitude Excursion From Assigned Altitude; Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Weather / Turbulence
Flight Crew Regained Aircraft Control
Weather
Just west of the MXQ VOR; in IMC conditions; we encountered a pocket of heavy precipitation (not painting on either radar screen) accompanied with severe turbulence and loss of aircraft control. The updraft disengaged the auto-pilot and yaw damper which resulted in a vertical climb of 4;800 FT per minute. Control was regained at 33;800 FT. The Captain (pilot monitoring) was able to then notify ATC of the altitude deviation and within a few minutes we provided a more complete PIREP to the controllers.
HS-125 First Officer reported severe turbulence encounter that resulted in 4;800 FPM uncommanded rate of climb from 32;000 FT to 33;800 FT before control was regained.