Cessna 402/402C/B379 Businessliner/Utiliner
Flight Crew Commercial
Deviation - Altitude Excursion From Assigned Altitude; Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Weather / Turbulence
Flight Crew Regained Aircraft Control
Weather
In VMC at 4;500 MSL we encountered sustained moderate turbulence. During this time; we encountered an isolated incidence of severe turbulence; resulting in momentary loss of control; an altitude loss of approximately 200 feet; and the pilot and copilot striking their heads on the ceiling. There were no passengers on board. We were approximately 75 miles northeast of BIL.
C402 Captain experiences moderate to severe turbulence at 4;500 feet resulting in a 200 foot altitude loss.