As part of the Helicopter Operations Development Plan, this document outlines a phased study of area navigation applications in the control of low-altitude IFR helicopter operations, with particular emphasis on methods of reducing controller workload in order to make the use of direct random routes feasible. Each of the four phases of the plan embodies analysis, simulation, and validation. The study is evolutionary; Phase 1 starts with the basic functions of generating conflict-free routes, and maintaining positive separation between aircraft in areas outside of radar coverage. Phase 2 introduces terrain problems in mountainous areas. Phase 3 investigates interactions between fixed and random routes, and between fixed-wing aircraft and helicopters in major terminal areas. Phaseuptions in navigation, communications, and surveillance coverage) in which the airborne separation assurance function will be investigated). A broad outline of the entire plan is presented, with a detailed schedule of the first phase. Keywords: Air traffic control, RNAV).

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