FAA NAS Architecture System Engineering Process. OMG Transportation Tammy Parsons April 27, 2004. NAS Architecture. Physical. Functional. | | | | | | | | | |. Requirements. Program Data . Service Groups. Services. Capabilities. Mechanisms (systems, people, Support activities). …….
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April 27, 2004
Existing 4 levels
of NAS functional
sequence diagrams, etc.
The Flight Planning Service provides both flight plan support and flight plan data processing to support the safe and efficient use of the nation's airspace through the development and use of coordinated flight plans. This includes preparing and conducting pre-flight and in-flight briefings, filing flight plans and amendments, managing flight plan acceptance and evaluation, preparing flight planning broadcast messages, and maintaining flight-planning data archives. This service offers preparation to conduct a flight within the NAS and allows changes to flight profiles while operating within the NAS.
Flight Plan Support
Flight plan support takes the user's intention for a flight, compares that intention against known NAS constraints and provides feedback to the user. The user's intention includes expected route, altitude, time of flight, and aircraft capabilities. Constraints include available routes, special use airspace (SUA) restrictions, daily demand conditions and anticipated flight conditions including weather and sky conditions (e.g. volcanic ash, smoke, birds), winds and temperatures, surface conditions, and any significant meteorological condition. Aeronautical information includes notices to airmen containing information concerning the establishment, condition, or change in any NAS component (facility, service, or procedure, or hazard in the NAS) the timely knowledge of which is essential to flight. Based on this constraint identification and feedback the user develops a flight plan that best meets individual objectives. This support includes both the initial flight plan and any proposed user proposed amendments along the way.
Flight Data Management
Flight data management maintains the knowledge of a flight within the NAS. This activity includes both Visual Flight Rules (VFR) and Instrument Flight Rules (IFR) flights from activation until flight plan cancellation or closing. The management of flight data can vary from an indication that the flight plan is active in the NAS until closure or can include maintaining knowledge of current positions in the NAS through pilot reports and/or radar contact and updates to the projected forward trajectory. The forward trajectories support separation assurance and flight advisories in their allocation of the flight to the appropriate service provider. Implementation of flight data management occurs at or near the start of a planned flight. It includes activation following the issuance of a clearance for flight, distributing flight plans to appropriate ATC facilities along routes, as well as updates based on current position and along the route of flight including changes based on in-flight amendments. Once an IFR flight is airborne or VFR associated flight plan has been activated, the flight plan remains active in the NAS until the flight plan is closed. Information associated with the flight remains available to all authorized users, controllers/specialists, emergency and supervisory personnel before, during, and after the flight as necessary for processing.