A system description has both breadth and depth the

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A system description has both breadth and depth. The breadth of a system description refers to the system boundaries. Bounding refers limiting the system to those elements of the system model that affect or interact with each other to accomplish the central mission(s) or function. Depth refers to the level of detail in the description. In general, the level of detail in the description varies inversely with the breadth of the system. For a system as broad as the National Airspace System (NAS) our description would be very general in nature with little detail on individual components. On the other hand, a simple system, such as a valve in a landing gear design, could include a lot of detail to support the assessment. The system is defined as: “A composite at any level of complexity, of personnel, procedures, material, tools, equipment, facilities, and software. The elements of this composite entity are used together in the intended operation or support environment to perform a given task or achieve a specific production, support, or mission requirement.” Graphically, this is represented by the 5M (depicted in Figure 16.6) and SHELL models (depicted in Figure 16.7), which depict, in general, the types of elements that should be considered within most systems. Five M Model Five M Model has discussed below: 1. Mission: The mission is the purpose or central function of the system. This is the reason that all the other elements are brought together. 2. Man: This is the human element of a system. If a system requires humans for operation, maintenance, or installation (c) UPES, Not for Reproduction/ Sale
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Notes ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ Aviation Safety & Security Management this element must be considered in the system description. In aviation, this includes not only the pilot, but all other persons directly involved with the operation of aircraft like flight crew, ground crew, ATC, meteorologist etc. Figure 16.6: Five-M Model 3. Machine: This is the hardware and software (including firmware) element of a system. In aviation, this includes the aircraft including its systems & associated software. 4. Management: Management includes the procedures, policy, and regulations involved in operating, maintaining, installing, and decommissioning a system. 5. Media: Media is the environment in which a system will be operated, maintained, and installed. This environment includes operational and ambient conditions. Operational environment means the conditions in which the mission or function is planned and executed. Operational conditions are those involving things such as air traffic density, communication congestion, workload, etc. Part of the operational environment could be described by the type of operation (air traffic control, air carrier, general aviation, etc.) and phase (ground taxiing, takeoff, approach, en route, transoceanic, landing, etc.).
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