the Aviation Dictionary

Newton's third law - The law of physics that states:
"For every action, there is an equal and opposite
reaction."
Newton's first law of motion - The law of physics that
describes inertia. "A body at rest tends to remain at rest
and a body in motion tends to continue to move at
constant speed, along a straight line, unless it is acted
upon by an external force."
Newton's second law of motion - "The greater the
force acting on an object, the greater the acceleration.
And the greater the mass, the less the object will
accelerate."
Newton's third law of motion - The law of physics that
describes action and reaction. "For every action, there
is an equal and opposite reaction."
nibble - To take small bites or quantity.
Newton's third law . no-load current
nipple pipe fitting - A short piece of pipe fitting
threaded on both ends.
nitrate - A salt or ester of nitric acid (HN03). Used in
some dopes to protect fabric-covered aircraft.
nitrate dope - A finish for aircraft fabric, consisting of
a film base of cellulose fibers dissolved in nitric acid
with the necessary plasticizers, solvents, and thinners.
nitric acid - A colorless or yellowish flowing,
suffocating, caustic, corrosive, water-soluble liquid
(FINO3) with powerful oxidizing properties.
nitriding - A case hardening in which a steel part is
heated in an atmosphere of ammonia (NH~.) The
ammonia breaks down, freeing the nitrogen to combine
with aluminum in the steel to form an extremely hard
abrasive-resistant aluminum nitride surface. Cvlinder
walls and crankshaft journals can be nitrided.
nibbler - A sheet metal cutting tool that cuts the metal nitrite - A salt or ester of nitrous acid (FINO2).
by a series of small nibbles or bites.
nitrogen - A colorless, tasteless, odorless, gaseous
nichrome - An alloy of nickel and chromium. It is used element forming - nearly 4/5 of the Earth's atmosphere.
for making precision wire-wound resistors.
no gyro approach - A radar approachlvector provided
nick - A sharp-sided gouge or depression with a V- in case of a malfunctioning gyro-compass or
shaped bottom that is generally the result of careless directional gyro. Instead of providing the pilot with
handling.
headings to be flown, the controller observes the radar
track and issues control instructions "turn rightlleft" or
nickel - A silver-white, hard, malleable, metallic
"stop turn" as appropriate.
chemical element with a symbol of Ni and an atomic
number of 28. Used for plating because of its high no gyro vector - See no gyro approach.
resistance to oxidation.
no procedure turn (NOPT) - No procedure turn is
nickel silver - A metal alloy of copper, zinc, and nickel. required nor authorized.
nickel-cadmium battery (Nicad)- A battery made up no transgression zone (NTZ)- The NTZ is a 2,000
of alkaline secondary cells. The positive plates are foot wide zone, located equidistant between parallel
nickel hydroxide, the negative plates are cadmium runway final approach courses in which flight is not
hydroxide, and potassium hydroxide is used as the allowed.
electrolyte.
noble - Chemically inert or inactive, . esvecially toward
A
night - The time between the end of evening civil oxygen.
twilight and the beginning of morning civil twilight, as
noble gas - An inert gas such as neon, argon, krypton,
published in the American Air Almanac, converted to
and xenon.
local time.
nocturnal inversion - A surface-based stable layer that
night [ICAO]- The hours between the end of evening
occurs due to nighttime radiational cooling.
civil twilight and the beginning of morning civil
twilight or such other period between sunset and nodal system - A vibration dampening system used by
sunrise as can be specified by the appropriate authority. Bell Helicopter to reduce main rotor vibration.
Note: Civil twilight ends in the evening when the center
of the sun's disk is 6 degrees below the horizon and
begins in the morning when the center of the sun's disk
is 6 degrees below the horizon.
nimbostratus - A dark gray cloud layer that produces
rain or snow.
Nimonicm alloy - A nickel-chromium alloy used for
sheet-metal fabrications in gas-turbine engines.
noise - 1. A general term for any loud or unusual sound
that is annoying or excessive. 2. Undesired signals
within an electronic circuit.
noise suppressor - A device installed in the tailpipe of a
turbojet engine to slow the mixing of the exhaust gases
with the surrounding air, thus decreasing the intensity
of the sound.
no-load current - The electrical current draw of a
device when the device is not under load.
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