Learjet 60
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Air Traffic Control Military 27; Air Traffic Control Non Radar 20; Air Traffic Control Radar 20; Flight Crew Last 90 Days 95; Flight Crew Total 13000; Flight Crew Type 2500
Situational Awareness
Deviation - Altitude Excursion From Assigned Altitude; Inflight Event / Encounter Weather / Turbulence; Inflight Event / Encounter Loss Of Aircraft Control
Flight Crew Regained Aircraft Control
Weather
[We were] flying through an area of weather at FL290. Without warning aircraft was caught in an updraft. Immediate call to Center to advise of the uncontrollable ascent; aircraft vertical ascent of about 700 to 800 FT. Once the aircraft was under control [we] returned to assigned altitude. Center immediately asked if all passengers were okay. They were and we continued to destination without further incident.
LR60 Captain reported and uncontrolled 800 FT climb from FL290 because of updraft.