"Control systems." . . "Inventory." . . . . "FEDERAL AVIATION ADMINISTRATION OKLAHOMA CITY OK CIVIL AEROMEDICAL INST." . . "Aircraft instrumentation." . . "Unmanned." . . "Taxonomy." . . "Human Factors Engineering & Man Machine System." . . "Aircraft." . . "Design criteria." . . . . . . . . . . . . . . "An Assessment of Pilot Control Interfaces for Unmanned Aircraft"@en . . . . . . . . . "An assessment of pilot control interfaces for unmanned aircraft"@en . . . . . "An inventory of control systems for unmanned aircraft was completed for 15 systems from nine separate manufacturers. To complete the inventory, a taxonomy of control architectures was developed. The taxonomy identified four levels of horizontal aircraft control, four levels of vertical control, and three levels of speed control. The most automated level of control was a waypoint-level that was found to be present in all of the systems inventoried. Implications of these levels of control on design are discussed."@en . . . "Pilots." . . "Cockpits." . . "Speed regulators." . .