N

NPV Non-Precision Approach procedure with Vertical Guidance
NPV Net Present Value
NR Noise Rating
Nr. Number
NRC National Research Council
NRF NATS Research Facility
NRL (US) Naval Research Laboratory
NRP North Reference Pulse
NRZ Non Return to Zero (RMCDE)
NRZI Non Return to Zero Inverted (RMCDE)
ns Nanosecond *
NS Navigation Separation
NS Next Sector
NSAP Network Service Access Point *
NSC New Scottish Center
NSC Notice to Airmen Selection Criteria *
NSD Navigational Status Display
NSDU Network Service Data Unit
NSE Navigation System Error *
NSM Network System (Sensor) Management
NSSG Navigation and Separation Sub-Group
NSSR Next/New Secondary Surveillance Radar Code (MADAP)
NSTB National Satellite Test Bed
NSVN NATO Secure Voice Network
NSWC Naval Surface Warfare Centre
NT Microsoft Windows NT Operating System
NT Northern Telecom (RMCDE)
NTA No Traffic Accepted Message
NTACNL No Traffic Accepted Cancellation Message