Appendix B - Acronyms and Abbreviations

N NPIAS—national plan of integrated airport systems NR—number N—north NRC—non-recurring charge NA—not authorized NRCS—national radio communications systems NAAQS—national ambient air quality standards NSAP—National Service Assurance Plan NADA—ADIN concentrator NSRCATN—National Strategy to Reduce Congestion on NADIN—National Airspace Data Interchange Network America’s Transportation Network NADSW—NADIN switches NSSFC—National Severe Storms Forecast Center NAILS—National Airspace Integrated Logistics Support NSSL—National Severe Storms Laboratory, Norman, OK NAMS—NADIN IA NSWRH—NWS Regional Headquarters NAPRS—National Airspace Performance Reporting System NTAP—Notices To Airmen Publication NAS—National Airspace System or Naval Air Station NTP—National Transportation Policy NASDC—National Aviation Safety Data NTSB—National Transportation Safety Board NASP—National Airspace System Plan NTZ—no transgression zone NASPAC—National Airspace System Performance Analysis NW—northwest Capability NWS—National Weather Service NATCO—National Communications Switching Center NWSR—NWS weather excluding NXRD NAV—navigation NXRD—advanced weather radar system NAVAID—navigation aid NAVMN—navigation monitor and control O NAWAU—National Aviation Weather Advisory Unit NAWPF—National Aviation Weather Processing Facility OAG—official airline guide NB—northbound OALT—operational acceptable level of traffic NCAR—National Center for Atmospheric Research, OAW—off-airway weather station Boulder, CO OBSC—obscured NCF—National Control Facility OBST—obstruction NCIU—NEXRAD Communications Interface Unit ODAL—omnidirectional approach lighting system NCP—noise compatibility program ODAPS—oceanic display and processing station NCS—national communications system OEP—operational evolution plan/partnership NDB—non-directional radio beacon OFA—object free area NDNB—NADIN II OFDPS—offshore flight data processing system NE—northeast OFT—outer fix time NEM—noise exposure map OFZ—obstacle free zone NEPA—National Environmental Policy Act OM—outer marker NEXRAD—next generation weather radar OMB—Office Of Management and Budget NFAX—National Facsimile Service ONER—Oceanic Navigational Error Report NFDC—National Flight Data Center OPLT—operational acceptable level of traffic NFIS—NAS Facilities Information System OPR—operate NGT—night OPS—operation NI—network interface OPSW—operational switch NICS—national interfacility communications system OPX—off premises exchange NM—nautical mile(s) ORD—operational readiness demonstration NMAC—near mid-air collision ORIG—original NMC—National Meteorological Center OTR—oceanic transition route NMCE—network monitoring and control equipment OTS—out of service; organized track system NMCS—network monitoring and control system OVR—over NMR—nautical mile radius NOAA—National Oceanic and Atmospheric Administration P NOC—notice of completion PABX—private automated branch exchange NONSTD—nonstandard PAD—packet assembler/disassembler NOPT—no procedure turn required PAEW—personnel and equipment working NOTAM—notice to airmen PAM—peripheral adapter module NPDES—National pollutant discharge elimination system PAPI—precision approach path indicator NPE—non-primary airport entitlement PAR—precision approach radar; preferential arrival route B-8