Aeronautical Terms beginning with N

National Airspace System (NAS)

The common network of United States airspace air navigation facilities, equipment and services, airports or landing areas; aeronautical charts, information and services; rules, regulations and procedures, technical information; and manpower and material.

National Aeronautical Charting Group (NACG)

A Federal agency operating under the FAA, responsible for publishing charts such as the terminal procedures and en route charts. Moved to Aeronautical Information Services AJV-A

National Route Program (NRP)

A set of rules and procedures designed to increase the flexibility of user flight planning within published guidelines.

National Security Area (NSA)

Areas consisting of airspace of defined vertical and lateral dimensions established at locations where there is a requirement for increased security and safety of ground facilities. Pilots are requested to voluntarily avoid flying through the depicted NSA. When it is necessary to provide a greater level of security and safety, flight in NSAs may be temporarily prohibited. Regulatory prohibitions are disseminated via NOTAMs.

National Transportation Safety Board (NTSB)

A United States Government independent organization responsible for investigations of accidents involving aviation, highways, waterways, pipelines, and railroads in the United States. NTSB is charged by congress to investigate every civil aviation accident in the United States.

No-gyro approach

A radar approach that may be used in case of a malfunctioning gyro-compass or directional gyro. Instead of providing the pilot with headings to be flown, the controller observes the radar track and issues control instructions turn right/left or stop turn, as appropriate.

Nondirectional radio beacon (NDB)

A ground-based radio transmitter that transmits radio energy in all directions.

Nonprecision approach

A standard instrument approach procedure in which only horizontal guidance is provided.

No procedure turn (NoPT)

Term used with the appropriate course and altitude to denote that the procedure turn is not required.

Notice to Airmen (NOTAM)

A notice filed with an aviation authority to alert aircraft pilots of any hazards en route or at a specific location. The authority in turn provides means of disseminating relevant NOTAMs to pilots.

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