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NF
NF 1 French material specification prefix.
2 Night fighter.
3 Notched filter.
4 Norsk Flygerforbund [ALPA, office Oslo] (Norway).
N f , N F 1 Fan rpm.
2 Relationship between power-turbine speed and
gearbox governor.
nF Nanofarad.
n.f. 1 Noise factor (radio).
2 Negative feedback.
NFA Near-field atmospherics and aerodynamics.
NFAC National Full-scale Aerodynamics Complex
(NASA Ames).
NFCS Nuclear forces communications satellite.
NFCT Non-Federal control tower (FAA).
NFD National flight data [C adds Center, D Digest, PS
processing system] (FAA).
NFE Near-field effects.
NFER Near-field electromagnetic ranging.
NFF No fault found.
NFFP National aeronautical research programme
(Sweden).
NFG The Newfoundland Group, airline labour
watchdog (US).
NFH NATO frigate helicopter.
NFIP National foreign intelligence program (US).
N-fire , NFIRE Near-field IR experiment (KEI).
NFIS Navigational flight inspection system.
N5+ Refractory NiCo alloy used for monocrystal
engine parts.
NFKK Women’s aero association (J).
NFL No-fly list (TSA).
NFLC National Flying Laboratory Centre [Cranfield],
(UK).
n.f.m., NFM Narrow-band FM.
NFMS Navigation and flight-management system.
NFN 1 Near-field noise.
2 Naval fires network (USN).
NFO Naval flight officer (USN).
NFOV Narrow field of view.
NFP 1 Net flightpath.
2 No-feathering plane, in which an observer would see
no variation in helicopter rotor cyclic pitch.
NFPA National Fire Protection Association [office,
Boston, MA] (US); many annexes, eg * 417 specifies resistance
of ADB (2) to an external fire.
NFRL Naval Facilities Research Laboratories (USN).
NFS 1 Network file system.
2 National Fire Service (UK, WW2).
3 Near-field source.
NFSN NATO French-speaking nations.
NFT 1 Night-flying test.
2 Navigation flight test.
NFTC NATO flying training in Canada [office, Ottawa
K1P 6L7].
NFTM Noise and flight-track monitoring.
NFU Non-formed unit (EAW).
NFWS Navy Fighter Weapons School [NAS Miramar]
(US).
NFZ No-fly zone.
NG 1 Natural gas, hence LNG = liquid natural gas.
2 Next generation.
NG, Ng Nitroglycerine.
N g Gas-generator rpm., or number of cycles.
n G
Vertical acceleration due to gust.
NGA National Geospatial-intelligence Agency [until
2004 was NIMA/Nima] (US).
NGAGC See Nexcom.
NGATM New-generation air-traffic manager.
Ngats Next-Generation Air Transportation [or Traffic]
System (JPDO).
NGAUS National Guard Association of the US.
NGB National Guard Bureau (US).
NGC Nylon/graphite composite.
NGCCS Next-generation command and control
system.
NGDC National Geographic Data Center (NOAA).
NGDR Next-generation [broadband] digital receiver.
NGE Non-ground effect.
NGEA Nouvelle génération école/appui [combataircraft
trainer] (F).
NGIFF New-generation IFF.
NGL Natural-gas liquids.
NG-LRS Next-generation long-range strike.
NGLS Next-generation launch system.
NGLT Next-generation launcher technology.
NGM Nested-grid model [weather computer program].
NGO Non-government organization (US).
NGPS Navstar global positioning system.
NGR 1 Night-goggle readable (ie at IR level).
2 Next-generation GPS receiver.
3 Nitrogen gas reduction.
NGS 1 Naval gunfire support.
2 National Geodetic Survey (NOAA).
3 Nitrogen generation system.
4 National [computer] Grid Service (UK).
NGSA Next-generation single-aisle.
NGSP National geodetic-satellite program (NASA).
NGSST Next-generation SST.
NGST Next-generation space telescope, following
Hubble.
NGT 1 New-generation trainer.
2 Night.
NGTA Next-generation twin-aisle.
NGTCS Next-generation target control system.
NGTE National Gas Turbine Establishment (formerly
at Pyestock, UK).
NGTOS Next-generation theater observation system
(USN).
NGV Nozzle guide vane.
NGW Nuclear gravity weapon.
N H HP rpm, engine speed, also written NH or N 2 .
NHA Naval Helicopter Association [office, Coronado,
CA92178–0578] (US).
NHC 1 Navigator’s hand controller.
2 National Hurricane Center (NWS).
NHCR National Flying League (J).
NHE Notes and helps editor.
NHGA National Hang-Gliding Association (UK).
NHMF National Heritage Memorial Fund (UK).
NHP Non-handling pilot.
NHR National Flying Association (J).
NHS National hypersonics strategy (US).
NI Noisiness Index (South Africa, Van Niekerk/Muller,
1969; see noise.
Ni Nickel.
Number of stress reversals to fail specimen.
N i
N i
445