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The information processing associated with flight replanning provides a framework for identifying the implications of the analysis on reallocation of functions among stakeholders and, of specific interest to this effort, the changes in airborne replanning sub-functions. Computational or information processing models will be briefly described, and then the Abbott (1993) model will be used to illustrate the proposed changes in flight replanning function allocation among stakeholders.
Computational descriptions. All functions, whether they are performed by humans or automated systems, involve not only the observable actions themselves, but also the sensing and processing of information requisite to the actions (and, in fact, sometimes information processing occurs but does not result in execution of an observable task [e.g., a pilot processes data in a non-normal situation to determine whether to divert, but decides to continue to the original destination.]) Data and information from the aircraft, its systems, aircraft and ground personnel, and the environment must be collected and processed in order to understand the situation, set goals, make decisions, and determine the appropriate actions. It is useful to decompose functions in this way because it is asserted that it is at the level of information processes that the activities, information, and authority of ATC, AOC and the flight crew can be systematically analyzed and allocated.
Abbott (1993) presents a functional decomposition of commercial flight deck activities from both an operational function (e.g., flight management, communication management, etc.) and computational function (e.g., monitoring, assessing, determining actions, etc.) perspective, and thus is a useful starting point for describing an airborne functional concept for strategic flight planning to support Free Flight.
Flight Management
In the Abbott (1993) scheme, flight management is the first-level function of managing all parameters relative to flight planning, guidance, and control. This function directly supports the mission goal of the vehicle (to move passengers and cargo from airport gate to airport gate safely and efficiently). This function is more comprehensive than the functionality of a conventional flight management system; it entails all the flight management functions currently performed by the flight management system and the flight crew relative to control of the aircraft, and guidance along and planning of the aircraft's route. The flight management function itself is divided into two major subfunctions: flight guidance and flight control. These two subfunctions are further subdivided or decomposed as shown in Figure 17.
Figure 17. General elements of flight management
Flight Management
Flight guidance Flight control
plan: Develop a goal. A goal determines a desired state.
monitor: Obtain information relative to achieving or maintaining the goal.
assess: Compare the current state with the desired state.
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本文链接地址：Airborne-Based Conflict Probe(44)
