N
N : Neper
N : North
N : No distinct tendency (in RVR during previous 10 minutes)
n : Symbol for nano- (10-9)
N1 : Engine low pressure rotor speed
N90 : New York Tracon
N/A : Not Applicable
N/C : Not Comparable
NA : National Administration
NA : Not Available
NA : Not Authorized
NABS : National Augmentation Broadcast System
NAC : North Atlantic Council
NACA National Advisory Committee for Aeronautics
NACMA : NATO Agency for Air Command and Control System Management
NADC : NATO Air Defence Committee
NADGE : NATO Air Defence Ground Environment
NADIN : National Airspace Data Interchange Network
NADIN II National Airspace Data Interchange Network II (the national digital message switching network for
aeronautical data)
NAEW & C : NATO Airborne Early Warnings (and Control)
NAFTA : North American Free Trade Agreement (Canada, US, Mexico)
NAGU : Notice Advisory to GLONASS Users
NAI : Non Automated Initiation
NAIA : New Athens International Airport
NAIS : Norwegian Aeronautical Information System
NAK : Negative Acknowledgement (ICAO)
NALLA : National Long Lines Agency
NAM : North America Region (ICAO)
NAMC : National Airspace Management Cell
NAME : Nadge - ADMAR Message Exchange
NAMILCOM : NATO Military Committee
NAMSA : NATO Maintenance and Supply Agency
NAMSO : NATO Maintenance and Supply Organisation
NANU : Notice Advisory to NAVSTAR Users
NAP : National Associated Programmes
NAR : North American Route System
NARDS : Norwegian Automatic Dependent Surveillance
NARFA : National Radio Frequencies Agency
NARG : Navigation Aids and Area Navigation Group (ICAO - EANPG)
NARSIM : NLR ATC Research Simulator
NAS : National Airspace System
NAS : Naval Air Station
NAS National Aircraft Standard
NAS : Network Administration System (DAKOS, FFM / RAPNET - MAS UAC)
NASA : National Aeronautics and Space Administration (US)
NASA RTLX : NASA Raw Task Load indeX
NASA TLX : NASA Task Load indeX
NASC : National AIS System Centre
NASPAC : National Airspace Performance Analysis Capability
NAS-Plan : National Airspace Plan
NAT : North Atlantic Tracks
NAT ADS : North Atlantic Automatic Dependent Surveillance
NAT ATMG : North Atlantic Air Traffic Management
NATCA National Air Traffic Controllers Association
NAT CADAG : North Atlantic Communications Automation and Data Link Applications Group
NAT CMA : North Atlantic Region Central Monitoring Agency
NAT IMG : North Atlantic Implementation Management Group
NAT MWG : North Atlantic Mathematicians Working Group
NAT OPS MNG : North Atlantic Operations Managers Meeting
NAT RSSIG : North Atlantic Reduced Separation Standard Implementation Group
NAT SPG : North Atlantic Systems Planning Group (ICAO)
NAT VSIG : North Atlantic Vertical Separation and Implementation Group
NAT NAM : North Atlantic / North America (ICAO Regions)
NATCON : North Atlantic Concept
NATINAD(S) : NATO Europe Integrated Air Defence (System)
NATMC : NATO Air Traffic Management Committee (former CEAC)
NATN : (Swedish) National Aeronautical telecommunications Network
NATO : North Atlantic Treaty Organisation
NATS : National Air Traffic Services (UK)
NATSPG : North Atlantic Systems Planning Group (ICAO)
NAT-TFG : North Atlantic Air Traffic Forecasting Group
NAV : Navigation
NAV-1 : Radar Data System (Portugal)
NAVAID : Navigation(al) Aid
NAVDB : Navigation Data Base
NAVSAT : Navigation Satellite
NAVSEP : Navigation and Separation Specialist Panel
NAVSTAR : Navigation Satellite Timing and Ranging System
NB : Northbound
NBAA National Business Aircraft Association
NBFR : Not Before
NBO : (in a NOTAM) N: Indicates for immediate attention of aircraft operators, B: for inclusion in PIB’s and O:
Operationally significant for IFR flights.
NC : No Change
NC : Non-Critical
NC : Normally Connected
NCAA : NATO Civil Aviation Authority
NCAA : Norwegian Civil Aviation Authority
NCAB : National Civil Aviation Board
NCAIC : National Civil Aviation Information Centre
NCCA : No Clearance to Civil Aircraft
NCD : No Computed Data
NCIPD : National CIP Documents
NCMS : Network Channel Management Station
NCN : Non Compliance Notification
NCOP : Entry Coordination Point
NCS : Navigational Computer System
NCS : Network Communication System
NCS : Network Control System / Station (CBN - CNG)
NCW : Non Conformance Warning
ND : Navigation Display
ND : Network Digit (CCITT X.121 Structure)
NDA : National Distribution Agency
NDA : Next Data Authority (ICAO)
NDB : Nav Data Base
NDB : Non-Directional Beacon
NDE : Node Processor
NDS : Non-Deviation Status
NDS : Nuclear Detection System
NE : North-East
NEAN : North European ADS-B Network
NEAP : North European Application Project
NEB : Northeast Bound
NECP : Entry Coordination Point
NEG : No or Negative or permission not granted or that is not correct
NEGATIVE RA : RA applying maximum vertical rate (eg don’t descend > 500 ft/min)
NEI : Noise Exposure Index
NERC System : New En-Route Centre System (UK)
NERC : New En-Route Control Centre (UK)
NERS : North Atlantic European Routeing Scheme
NES : Navigation Ground Earth Stations
NESDIS National Environmental Satellite, Data, and Information Service
NET : Network Entity Title
NETCAP : Network Capacity (simulator)
NET-TF : Circuit Provisioning and Network Management Task Force
NEWCTOT : New Calculated Take-Off Time
NEWEOBD : New Estimated Off-Block Date
NEWEOBT : New Estimated Off-Block Time
NEWETOT : New Estimanted Take-Off Time
NEWPTOT : New Provisional Take-Off Time
NEWRTE : New Roure
NEXRAD : Next Generation Weather Radar
NF : Noise Figure
NFDC : Natianal Flight Data Center (USA)
NFL : Entry Flight Level (Re-Entrant Flight)
NFPPDS : National Flight Plan Processing System
N-FRG : Northern Federal Republic of Germany
NFS : Network Filing System
NGATM New Generation Air Traffic Manager
NGT : Night
NHIP : Nordic Harmonisation and Integration Programme
NIK : Nicky VOR
NIL : None or I have nothing to send to you
NIM : Navigational Integrity Monitoring (ICAO)
NIMA : National Imagery and Mapping Agency (of the US Department of Defence (DOD)
NIT : Nordic Implementation Team
NJRASA : Northern Joint Radar Advisory Service (UK)
NL : the Netherlands (ISO Country Code)
NL : Network Layer
NLA : New Large Aircraft
NLC : Netherlands Aviation College(NL) / Nederlands
Luchtvaart College
NLES : Navigation Land Earth Station
NLM : Nederlandse Luchtvaart Maatschappij (airline)
NLM Network Loadable Module
NLR : Nederlands Lucht- en Ruimtevaart Laboratorium
(NL) / National Aerospace Laboratory
NLT : Not Later Than
NM : Negotiation Manager (PATs)
NM : North Marker
nm, NM : Nautical Mile (1.852 m)
NMAC : Near Mid-Air Collision
NMC National Meteorological Center
NMC : Network Management Centre (Cell) (RAPNET /
MAS UAC / DAKOS)
NME/ad hoc : Ad Hoc Working Group of National
Management Experts
NMIL : Nieuw Milligen
NML : Normal
NMR : Nautical Miles Radius
NMR : National Military Representative
NMS : Navigation Management System
NMS : Network Management System / Switch
NMU : Navigation Management Unit
NNE : North-North-Eeast
NNW : North-North-West
NO : Norway (ISO Country Code)
NOAA : National Oceanic and Atmospheric Administration
NOAA : New Optimised Approach for ATSM Workshop
NOC : Network Operation Centre
NODE : NATS’ Operational Display Equipment
NOF : NOTAM Office
NOG OA&M : NOG Operations, Administration & Maintenance Subgroup (CNG - CBN)
NOG : Northern Telecom Network Operator’s Group (CNG - CBN)
NOG-FSG : NOG Features Subgroup (CNG - CBN)
NOMAS : NOTAM Management System (NL)
NONSTD : Nonstandard
NOPT : No Procedure Turn Required
NORAC : No Radio Contact
NORDO : No Radio (Aircraft without radio)
NOS : Network Operating System
NOSIG : No Significant Change (Used in trend-type landing forecasts)
NOTAM : Notice to Airmen ( A notice containing information concerning the establishment, condition or
change in any aeronautical facility, service, procedure or hazard, the timely knowledge of which is essential to personnel concerned with flight operations)
NOTAMN : New Notam
NOTAMR : Notam Replacing another Notam
NOTAMC : Notam Cancelling another Notam
NP : Network Protocol
NPA : Non Precision Approach
NPDU : Network Protocol Data Unit (RMCDE)
NPL : Night Plan
NPO KIP : [Russian]. Scientific Production Organisation ; Scientific Production Institute of Space Device Building
NPO PM : [Russian]. NPO Prikladnoi Mekhaniki (RU)Scientific Production Institute for Applied Mechanics
NPO : Scientific Production Organisation [Russian]
NPRM : Notice of Proposed Rule Making (FAA)
NPV : Net Present Value
NPV : Non-Precision Approach procedure with Vertical Guidance
NR : Noise Rating
Nr. : Number
NRF : NATS Research Facility
NRH : No Reply Heard
NRL : (US) Naval Research Laboratory
NRP : North Reference Pulse
NRP : National Route Plan/Program
NRZ : Non Return to Zero (RMCDE)
NRZI : Non Return to Zero Inverted (RMCDE)
ns : Nanosecond
NS : Navigation Separation
NS : Next Sector
NS : Nimbostratus
NSAP : Network Service Access Point
NSC : New Scottish Center
NSC : No signifant clouds (meteo)
NSC : Notice to Airmen Selection Criteria
NSD : Navigational Status Display
NSDU : Network Service Data Unit
NSE : Navigation System Error
NSM : Network System (Sensor) Manager
NSSG : Navigation and Separation Sub-Group
NSSR : Next/New Secondary Surveillance Radar Code
NSTB : National Satellite Test Bed
NSVN : NATO Secure Voice Network
NSW : No significant weather (meteo)
NSWC : Naval Surface Warfare Centre
NT : Northern Telecom (RMCDE)
NTAP : Notice to Airman Publication
NTE : Not to exceed
NTM F/T SIM : Nattenheim Fast Time Simulation
NTN : Network Terminal Number (CCITT X.121 Structure)
NTRY : Entry
NTSB : National Transportation Safety Board (US)
NUA : Network User Address
NUDET : Nuclear Detection
NVFR : VFR by night
NW : North-West
NW : Northwest Airlines (airline)
NWB : Northwest Bound
NWS : National Weather Service
NXRPT : Next Reporting Point
NXT : Next
Nl Engine Revolutions per Minute (percent)














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