the Aviation Dictionary

negative ion . Newton's second law
negative ion - An atom that has more electrons than
protons spinning around its nucleus.
negative moment - In aircraft weight and balance
calculations, a moment resulting from an arm being
forward of the datum.
negative pressure - Pressure that is less than
atmospheric pressure.
negative pressure relief valve - A valve in an aircraft
pressurization system that prevents the outside air
pressure from becoming greater than the pressure
inside the cabin
negative resistance - A condition in which the normal
direct relationship between voltage and current is
reversed.
neutral - 1. The condition in which a gear, lever, or
other mechanism is not engaged. 2. An electrical
condition that is neither positive nor negative.
neutral axis - An imaginary line through the length of a
loaded beam where the forces of compression and
tension are neutral.
neutral conductor - The conductor of a 3-phase circuit
or a single-phase three wire circuit that is of a ground
potential. The potential between the neutral and each of
the other conductors is equal in magnitude and phase.
neutral flame - A flame used in oxyacetylene welding
that is neither carburizing nor oxidizing and that uses
the correct ratio of acetylene gas and oxygen.
neutral line - In sheet metal bending. the line near the
middle of the sheet that is unaffected by either
negative stagger - The placement of the wings of a
compression on the inside of the curve, or by stretching
biplane in which the leading edge of the lower wing is
on the outside of the curve.
ahead of the leading edge of the upper wing.
neutral plane - An
negative static stability - A condition in which an
imaginary line drawn
object disturbed from a condition of rest will tend to
perpendicular to the
move further away from its condition of rest.
resultant flux in a
negative temperature coefficient - A condition where generator. For arcless
a conductor or device decreases in resistance as the commutation, the
temperature increases.
neutral plane should lie directly over the plane of the
negative thrust - The thrust produced when a propeller
brushes.
is moved into the beta range.
negative torque system (NTS) - A system in a
turboprop engine that prevents the engine from being
overdriven by the propeller. The NTS increases the
blade angle when the propellers try to overdrive the
engine.
negative transfer of learning - Students interpret new
things in terms of what they already know. Some
degree of transfer is involved in all learning. Previous
learning interferes with students' understanding of the
current task.
negative vacuum relief valve - A relief valve used on
pressurized aircraft that opens when outside air
pressure is greater than cabin pressure.
negative value -A
value less than zero.
neon - A gaseous element with a symbol of Ne and an
atomic number of 10.
neon bulb - A bulb that glows when neon vapor atoms
are excited by an electric arc.
neoprene - An oil-resistant synthetic rubber made by
polymerizing chloroprene. Used in items such as seals
and locknuts.
net thrust (Fn)- The effective thrust developed by ajet
engine during flight, taking into consideration the
initial momentum of the air mass prior to entering the
engine.
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neutral position - The position of the rotating magnet
of a magneto between the pole shoes. In the neutral
position, no lines of flux flow in the magneto frame.
neutral stability - A system is characterized by neutral
stability if, when displaced, it accelerates neither
toward nor away from its original position. The
atmosphere displays neutral stability when lapse rate is
equal to the dry adiabatic lapse rate.
neutral static stability - The condition of an object in
which, when once disturbed from a condition of rest, it
has neither the tendency to return to a condition of rest
nor to depart further from it. It continues in equilibrium
in the direction of disturbance.
neutralize - To make balanced or inert by combining
equal positive and negative quantities.
neutron - An uncharged particle in the nucleus of an
atom. Its mass is essentially equal to that of a proton.
never exceed speed - The speed beyond which an
aircraft should never be operated.
newton - The unit of force in the meter-kilogramsecond
system equal to the force required to impart an
acceleration of one meter per second squared to a mass
of one kilogram.
second law The law of physics that states:
"The acceleration produced in a mass by the addition
of a given force is directly proportional to the force,
and inversely proportional to the mass."