Abstract: An avionics simulator is provided in which an operational flight program processor is provided as a functional equivalent to a central processing unit of an avionics system of an aircraft being simulated. Accordingly, the Operational Flight Program may be run in the operational flight program processor in the same manner in which it would be run in the central processing unit of the avionics system of the aircraft itself. Accordingly, identity of operation is attained without the necessity of complex programming and/or interface generation. The remainder of the avionics simulation computer is software or firmware configured to replicate aircraft operation, responses, and data input.