This paper discusses a test approach for determining the optimum field of view of a flight simulator visual system as a function of aircraft mission. The program is intended to provide the information needed to decide which portions of the aircraft's total field of view should be simulated and which can be disregarded. The approach consists of three phases: drawing board evaluation, aircraft ground testing, and flight testing. The procedure is described using the CH-46 helicopter as an illustrative example but it is applicable directly to any aircraft, fixed or rotary wing. Pilot qualitative ratings are obtained for each simulated visual configuration during specified flight maneuvers. Results from the CH-46 program indicated that a pilot/copilot oriented visual system limited the training potential for both crewmembers. The optimum configuration for the CH-46E operational flight trainer was a pilot oriented visual system.