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N
N 1 Newton[s].
2 Shaft rotation speed, with suffix number (N 1 , N 2 etc)
for each shaft (see gas-turbine numerology).
3 Yawing moment.
4 Code: operates by sound in air (JETDS).
5 Code: navaid (ICAO).
6 Prefix, amount of cloud.
7 Number of turns in a coil, or of load cycles, usually
per second, or number of samples in statistics.
8 North (ICAO, or nothern).
9 Synoptic chart code: air mass has had characteristics
changed.
10 Telecom code: aircraft.
11 Avogadro’s number.
12 Nitrogen.
13 STOL aircraft (FAI).
14 Prefix, night, negative, nose, no.
15 Prefix, nuclear (USSR).
16 Knots [flight plan].
17 Nicrosil-nisil thermocouple.
18 IFR weather.
19 Non-scheduled civil transport flight.
20 Permanent special test (USAF/USN aircraft designation
prefix).
21 Trainer (USN 1922–60).
22 Noise.
23 Modified mission suffix, night or all-weather (USN
1950–62).
24 Aircraft category STOL aeroplanes (FAI).
n 1 Prefix, nano (× 10 –9 ).
2 Generalized symbol for an aircraft equipped with
Tacan only and 64-code transponder.
3 Normal acceleration in g, load factor.
4 Number in a sample, any integer.
5 Frequency, esp. of rotation.
6 Refractive index.
7 Negative, hence n-type semiconductor.
8 Number of frames or supports to a beam.
9 Subscript, normal, e.g., to leading edge.
N ~ 1 Normal force on 2-D aerofoil [per unit span, normal
to chord].
2 Normal acceleration factor [positive downwards].
(N) Night.
ṅ Angular acceleration.
N 1 Fan or LP compressor speed.
N 2 1 Nitrogen.
2 IP compressor speed (CAA).
3 HP compressor speed (2-shaft engine).
N 3 HP compressor speed (CAA).
N´, N° Rate of change of N(2) on spool-up or rundown.
N →
Vector representing integrated noise energy.
N-code ICAO code, amount of cloud.
N-display Target forms two blips on horizontal timebase
(as in K-display), lateral positions giving range and
relative amplitudes bearing.
N-layer N is set for any layer name [link, net, etc] or for
the initial [open system architecture].
N-sector Sector of radio range in which Morse N is
heard.
N-strut Arrangement of interplane struts or cabane
struts resembling N.
n-type semiconductor One in which charge carriers are
nearly all electrons.
N-wave Shockwave remote from source; far-field boom
signature, when profile of pressure/linear distance has
settled down to N-like profile.
(N) Night.
NA 1 Noise abatement (procedure).
2 Numerical aperture.
N/A 1 Not applicable, not available, not authorized, not
approved.
2 Navigation/attack.
N A Avogadro constant.
Na Sodium.
NAA 1 National Aeronautic Association of the US,
founded 1905 as Aero Club of America [Arlington, VA
22209–1805] (US).
2 National Aviation Academy [Clearwater FL33760]
(US).
3 National Aviation Authorities (European countries).
4 National Airport Authority (India).
NAAA National Agricultural Aviation Association
(US), or National Aerial Applicators Association [office,
Washington, DC] (US).
NAAAS National Association of Air Ambulance
Services [office, Basingstoke] (UK).
NAAC 1 National Aviation Associations Coalition
(US)
2 National Association of Agricultural Contractors
[promotes ag-aviation, office Maldon, Essex] (UK)
3 See sodium acetate.
NAADC North American Aerospace Defense
Command.
NAAFI Pronounced “naffy”, Navy, Army and Air
Force Institutes [civilian organization in support of Other
Ranks] (UK).
NAAM National Agricultural Aviation Museum
[Jackson, Mississippi] (US).
NAAP Netherlands Agency for Aerospace Promotion
(NIVR).
NAAQS National ambient-air quality standard[s].
NAAS 1 National Association of Aerospace Subcontractors
[office, Palos Verdes, CA] (US).
2 Naval Auxiliary Air Station (USN).
NAATS National Association of Air Traffic Specialists
[office, Wheaton, MD] (US).
NAAWS NATO anti-war warfare system.
NAB Navy Air Base (USN).
Nabs NATO air base Satcom.
NAC 1 North Atlantic Council, of NATO ambassadors.
2 Noise Advisory Council (UK).
3 National Air Communications (UK, 1939–40).
4 National Aviation Club [office, Arlington, VA] (US).
5 Naval Air Command (UK).
6 Naval Avionics Center (USN).
7 Non-airline carrier.
8 Network access controller.
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