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The National Airspace System Requirements Document (NAS-RD) is the source of functional and performance requirements for FAA systems that provide Air Traffic Control (ATC) services. All operational system's capabilities are traceable to specific requirements in the NAS-RD.

The NAS-RD is updated annually via the National Change Process (NCP) to accurately reflect the current, improvements to the operational NAS. Future, planned, and functional improvements to the NAS, are reflected in the Mid-Term and Far-Term versions of the NAS-RD.

As-Is
Available Requirements
Available Architectures

Mid-Term
Available Requirements
  • None
Available Architectures

Far-Term
Available Requirements
Available Architectures


  • Approved Baseline A product or set of products that have been approved by the appropriate adjudication authority and are subject to configuration change management procedures. The As-Is products are approved by the NAS CCB, and the Mid-/Far-Term products are approved by the JRC.
  • Final Draft A product or set of products that have been reviewed and approved by the NAS Chief Architect or NAS Requirements and Interface Manager but have not been approved by the appropriate adjudication authority.
  • Review Draft A product or set of products that are available for review and comment.
  • Retired A product or set of products that have been superseded by a more recent approved baseline.

U.S. Department of Transportation
Federal Aviation Administration
800 Independence Avenue, SW
Washington, DC 20591
1-866-TELL-FAA (1-866-835-5322)