1Dk4eXg

NIAC
NIAC 1 National Infrastructure Advisory Council
[counter-terrorism] (US).
2 Northern Ireland Aerospace Consortium.
3 Navigation interface and autopilot computer.
NIAG NATO Industrial Advisory Group.
Nial Nickel/aluminide diffusion coating.
NIAR 1 National Institute for Aviation Research
[Wichita State University, Kansas 67260–0093](US).
2 No inspection after rework.
NIAST National Institute for Aeronautics and Systems
Technology (South Africa).
NIAT 1 MAP-sponsored factory (USSR).
2 National institute for engineering research (R).
Ni/Au Nickel gold.
NIB Neodymium, iron, boron, permanent-magnet
material.
nib 1 Any substantially axial fore or aft-pointing fairing,
usually with concave surfaces.
2 Aft-pointing fairing between, and projecting behind,
two closely spaced jetpipes.
3 Forward-pointing extension at inner end of fixed
glove on VG aircraft.
nibbler Machine tool for eating away edge of sheet by
repeated local vertical shearing, in some cases with ability
to impart lateral compression or joggling.
nibble An approach to very limit of g-induced stall in air
combat, also see next entry.
nibbles Stall testing of aircraft in which AOA is
increased in small increments at 1 g, culminating in fully
developed stalls.
NIBS Neutral industry booking system [IG adds
interest group].
NIC 1 Newly industrializing country.
2 New installation concept.
Nicad See nickel/cadmium.
Nicalloy Nickel-iron alloy, low initial but high
maximum permeability for transformers, etc.
Nicalon Proprietary SiC alloys.
Nicap National Investigation Committee on Aerial
Phenomena (US).
Nicasil Ni/Cd/Si.
Ni/Cd, Nicad Nickel/cadmium electric battery.
NICE, Nice 1 NAT(2) implementation manager, or
management, cost/effectiveness.
2 NATO internet cryptography equipment.
3 Network-integrated cabin equipment,
Nicerol Widely used protein foam compound for firefighting.
Nichols diagram Plots stability of rigid aeroplane
showing open-loop frequency response in each axis
following control-surface deflection.
Nichrome American heat-resisting alloys (c 85% Ni,
15% Cr), eg for resistance wire.
nickel Ni, silver-white magnetic metal important in
corrosion-resistant alloys; density 8.9, MPt 1,453°C.
nickel/cadmium battery Cell having KOH (potassium
hydroxide) electrolyte, positive plates of nickel hydroxide
and negative plates of cadmium hydroxide.
Nicmos Near-IR camera and multi-object spectrometer.
NICP Navy inventory control point (USN).
Nicral Nickel/chromium/aluminium plasma spray.
Nicrosil Ni/Cr/Si.
NICS, Nics NATO integrated communications system;
Nimonic
O added “Organization”, MA added ‘Management
Agency’; became NACISA.
NID National interest determination.
Nidjam Nav/ident deception jammer.
NIDTS NATO integrated digital transmission system.
NIE National Intelligence Estimate[s] (US).
NIF 1 National infrastructure forum (UK).
2 National Ignition Facility [laser research] (LLNL).
NIFA National Intercollegiate Flying Association
[office, Cahokia, IL] (US).
NIFC National Inter-Agency Fire Center (US).
Ni/Fe, Nife Nickel/iron electric battery.
NIG NATS Infringement Group (UK).
night airglow See airglow.
night and all-weather Strictly, interceptor can be used at
night or in any weather, seldom true at time this term was
in use; more accurately meant night and rain or snow but
with acceptable landing minima.
Night cap, NCAP Night combat air patrol (DoD).
night effect Phenomenon most noticeable near sunrise
and sunset when directional radio signals (D/F, radio
range, VOR) give false readings thought to be due to variations
in ionosphere.
night fighter Aircraft intended to intercept other aircraft
at night; today implicit in term ‘fighter’ or ‘interceptor’.
night-flying chart Special editions of regional charts,
usually 1:1,000,000, eliminating all detail unseen at night
but emphasising lights, navaids and fields with night facilities
(US).
Night Owl Night ground-attack mission.
Night rating Enables holder of PPL to fly at night as PIC
with passenger[s].
night vision Human seeing after eyes have had time fully
to adapt to near-absence of light, with irises fully open.
NIH Not invented here, rejection of foreign developments.
NIHL Noise-induced hearing loss.
NiH 2 Nickel/hydrogen electric battery.
NII 1 Scientific test institute (USSR, R; many, each
covering one subject).
2 National, or NATO, information infrastructure.
NIID Defence manufacturers association (Netherlands).
NIIR Radio engineering research institute (R).
NIIRS National imagery interpretability rating scale
(US, runs 0 to 9).
NIL 1 Code: ‘I have no message for you’ (ICAO).
2 National Information Library (NIMA).
NILE, Nile NATO improved link 11.
NIM National Imagery & Mapping; A adds Agency, C
college (DoD, Bethesda, MD).
Nima See previous; now NGA.
nimbostratus, Ns Thick dark blanket cloud in
low/middle band (2,000–6,000 m), mainly ice crystals and
supercooled water, large horizontal extent, usually rain.
nimbus Not normally used as cloud type but as adjective
meaning rain-producing, as in Cb and Ns.
Nimby Not in my back yard.
NIMCIS New integrated Marines communications and
information system.
Nimocast British casting alloys, composition akin to
Nimonics.
Nimonic Family of refractory and anticorrosive alloys
based chiefly on nickel, originally Mond patents,
446