Abstract: There is disclosed an initiator assembly for a ballistic missile system to ffect fluid flow of a gas from a source thereof to user equipment disposed in a housing therefor including gas inlet and outlet conduits and comprised of a rotor member journalled for rotation in the housing and formed with a mass of an eccentric weight distribution with respect to the axis of rotation and wherein the rotor is provided with an explosive assembly ignited by a striker assembly activated by launch acceleration of the missile and wherein a drive piston of the explosive assembly fractures a closure element disposed in one of said gas conduits.

Abstract: The invention relates to lock mechanisms by which a missile or analogous tem may be prevented from undergoing an undesired launch or ignition. Specifically, the invention is a rotating lock mechanism which may be rotated in precise clockwise and counterclockwise steps by an electrical stepper motor or other source of precise rotation, in response to a predetermined sequence of electrical pulses.