Arrival metering in en route airspace can match the demand rate to the airport acceptance rate. Air traffic control (ATC) is evolving time-based control techniques to facilitate en route arrival metering. This allows fuel savings by using speed reduction to absorb delay. The logic for en route arrival metering: (1) estimates the undelayed landing time of each arrival; (2) assigns the earliest available landing time; and (3) controls each arrival to its terminal area arrival (feeder) fix according to the common schedule developed for all arrivals. The airplane flight management system (FMS), used along with the ATC computer as part of a distributed data processing system, can define a minimum fuel cruise and descent flight profile which is consistent with ATC constraints. A study of four-dimensional area navigation (4D RNAV) operational requirements for use in en route arrival metering has determined the functions and time-guidance accuracies needed for ATC compatible operations. A 4D RNAV capability is most easily achieved by wrapping a time navigation capability around a 3D FMS. Concepts for controlling a mix of 4D RNAV equipped and unequipped aircraft in a time-based en route arrival metering system have been the subject of on-going analyses and simulations by NASA-Ames. The use of 4D RNAV in en route arrival metering operations can save the operator fuel, reduce both pilot and controller workload, and reduce terminal airspace congestion.


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    Title :

    Use of 4-D RNAV in Time-Based en Route Arrival Metering


    Contributors:
    R. L. Erwin (author) / K. H. Izumi (author)

    Publication date :

    1990


    Size :

    19 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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