Aeronautical Terms beginning with N
NA
Not Authorized
NACG
National Aeronautical Charting Group. (obsolete)
NACO
National Aeronautical Charting Office
NAS
National Airspace System.
NASA
National Aeronautics and Space Administration
NASSI
National Airspace System Status Information
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 Airspace System (NAS)
Consists of a complex collection of facilities, systems, equipment, procedures, and airports operated by thousands of people to provide a safe and efficient flying environment.
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.
NAV/COM
Navigation and Communication Radio.
NAVAID
Navigational Aid.
Navigational Gap
A navigational course guidance gap, referred to as an MEA gap, describes a distance along an airway or route segment where a gap in navigational signal coverage exists. The navigational gap may not exceed a specific distance that varies directly with altitude.
NDB
Nondirectional Radio Beacon.
NFDC
National Flight Data Center
NFPO
National Flight Procedures Office
NGA
National Geospatial Intelligence Agency
NIMA
National Imagery and Mapping Agency
NM
Nautical Mile.
No procedure turn (NoPT)
Term used with the appropriate course and altitude to denote that the procedure turn is not required.
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.
NOAA
National Oceanic and Atmospheric Administration.
Non-RNAV DP
A DP whose ground track is based on ground-based NAVAIDS and/or dead reckoning navigation.
Nondirectional Radio Beacon (NDB)
An L/MF or UHF radio beacon transmitting nondirectional signals whereby the pilot of an aircraft equipped with direction finding equipment can determine bearing to or from the radio beacon and home on or track to or from the station. When the radio beacon is installed in conjunction with the ILS marker, it is normally called a compass locator.
Nonprecision approach
A standard instrument approach procedure in which only horizontal guidance is provided.
Nonprecision Approach Procedure
A standard instrument approach procedure in which no electronic glideslope is provided; e.g., VOR, TACAN, NDB, LOC, ASR, LDA, or SDF approaches.
Nonprecision Approach Runway
An instrument runway served by visual aids and a nonvisual aid providing at least directional guidance adequate for a straight-in approach.
Nonradar Approach
Used to describe instrument approaches for which course guidance on final approach is not provided by ground-based precision or surveillance radar. Radar vectors to the final approach course may or may not be provided by ATC. Examples of nonradar approaches are VOR, NDB, TACAN, and ILS/MLS approaches.
Nonradar Approach Control
An ATC facility providing approach control service without the use of radar.
Nonradar Arrival
An aircraft arriving at an airport without radar service or at an airport served by a radar facility and radar contact has not been established or has been terminated due to a lack of radar service to the airport.
Nonradar Route
A flight path or route over which the pilot is performing his/her own navigation. The pilot may be receiving radar separation, radar monitoring, or other ATC services while on a nonradar route.
Nonradar Separation
The spacing of aircraft in accordance with established minima without the use of radar; e.g., vertical, lateral, or longitudinal separation.
NoPT
No Procedure Turn.
NOTAM
Notice To Airmen
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.
NPA
Nonprecision Approach
NRP
National Route Program.
NRR
Non-Restrictive Routing
NSA
National Security Area.
NTAP
Notice To Airmen Publication
NTSB
National Transportation Safety Board.
NTZ
No Transgression Zone
NWS
National Weather Service.
Restrict the list to specific categories by clicking on the menubar at the top of the screen.