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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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faa nas architecture system engineering process

FAA NAS Architecture System Engineering Process

OMG Transportation

Tammy Parsons

April 27, 2004

nas architecture
NAS Architecture







Service Groups




(systems, people,

Support activities)





Improvement 1


Improvement n






operational improvements
Operational Improvements
  • Service Group
  • Service
  • Capability
  • Operational Improvement
  • Source References
  • Description
  • Benefits
  • Systems
  • Support Activities
  • People
  • Interfaces
  • Issues
  • Functional Architecture
  • Air Traffic Service Group
  • Flight Planning Service
  • Flight Plan Support Capability
  • Provide Interactive Flight Planning from Anywhere
  • Physical Architecture
  • NG-TFM
  • FAA Adaptation for Provide Interactive Flight Planning from anywhere
  • Flight Service Specialist
  • NG-TFM to CMS interface
faa standardized system engineering process
FAA Standardized System Engineering Process
  • System Engineering Manual defines processes
  • System Engineering Council supports and enforces processes
  • SE courses train the workforce in standard processes
system engineering process overview
System Engineering Process Overview

Customer Requirements

Requirements Analysis


Functional Analysis

& Modeling

se tool summary
SE Tool Summary
  • Requirements – DOORS
  • Functional Analysis – CORE
  • Modeling – Rational Rose
  • Synthesis – CATS-I
  • NAS-SR-1000 Requirements
    • Current NAS Operations
    • Trace to Capability (Current OI steps)
  • CONOPS Requirements
    • Requirements based on future customer needs
    • Trace to future OIs
functional analysis modeling
Functional Analysis & Modeling
  • NAS Functional Hierarchy
    • Service Group
    • Service
    • Capability
  • Enhanced Functional Flow Block Diagrams, N2 diagrams, Data Dictionaries
  • State/Activity Diagrams, Sequence Diagrams, Use Case Diagrams, Class Diagrams,
synthesis design
Synthesis (Design)
  • Mechanisms
    • Systems
    • People
    • Support activities
  • Mechanism data includes:
    • Description
    • Quantities
    • Deployment schedule
    • Interfaces
  • Programmatic data includes
    • Cost
    • Schedule
se product relationships
SE Product Relationships

Current operations



Operational Improvement





  • Service Group
  • Service
  • Capability
  • Operational Improvement
  • Source References
  • Description
  • Benefits




N2 diagrams

Data dictionary

Function descriptions






Existing 4 levels

of NAS functional


  • Systems
  • Support Activities
  • People
  • Interfaces



Functional and

Physical data


State diagrams,

sequence diagrams, etc.

flight planning example
Flight Planning Example
  • Example is for Current Flight Plan Support, a Current OI
    • NAS-SR-1000 requirements, rather than CONOPS
    • Existing systems
    • Provides the baseline operations against which future improvements will be made
fp functional analysis
FP Functional Analysis
  • Function descriptions (Service Group, Service, Capability) – available on NAS Architecture 5
  • Other products (EFFBDs and N2) under development
fp functional analysis1
FP Functional Analysis

Flight Planning

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.


fp modeling
FP Modeling
  • State/Activity Diagrams
  • Sequence Diagrams
  • Use Case Diagrams
  • Class Diagrams
  • The NAS Architecture is continuously updated to address:
    • Funding issues
    • Industry changes
    • Technology advances
  • As SE products are generated, they are made available on the Internet at NAS Architecture 5