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defined as the length of an arc on the
Earth’s surface subtended by an angle
of one minute at the centre of the
Earth.)
NAVAID NAVAID /nved/ abbreviation navigational
aid
navigation navigation /nv|$eʃ(ə)n/ noun
the theory and practice of planning,
controlling and recording the direction
of an aircraft
The basis of air navigation
is the triangle of velocities.
navigational navigational /nv|$eʃ(ə)nəl/
adjective referring to navigation
The
accuracy of modern navigational
equipment is much greater than older
systems.
navigational aid navigational aid /nv|$eʃ(ə)nəl
ed/ noun a mechanical or electronic
device designed to help a pilot navigate

Any type of navigational aid but particularly
electronic aids, for example
ADF (automatic direction finding) and
155 never-exceed speed
NDBs (non-directional beacons).
Abbreviation NAVAID
navigational line navigational line /nv|$eʃ(ə)nəl
lan/ noun same as position line
navigation lights navigation lights /nv|$eʃ(ə)n
lats/ plural noun lights on an aircraft
consisting of a red light on the left wing
tip, a green light on the right wing tip
and a white light on the tail
COMMENT: Navigation lights must be
used between sunset and sunrise.
navigation log navigation log /nv|$eʃ(ə)n lɒ$/
noun written details of headings and
times for a flight
The flight crew route
flight plan is a composite document
which also serves as a navigation log.
NDB NDB abbreviation non-directional beacon
necessary necessary /ness(ə)ri/ adjective
needed or essential
A rich mixture is
necessary at slow running.  as necessary
when needed
Warnings, cautions
and advisory messages are displayed
only when necessary.
necessity necessity /nə|sesti/ noun something
that is necessary or very important

Student pilots should understand the
necessity for treating thunderstorms
with great respect.
needle needle /nid(ə)l/ noun a thin metal
pointer in an instrument
The needle
indicated to zero.
needle valve needle valve /nid(ə)l vlv/ noun a
valve formed of a tapered needle projecting
into a small opening in a tube,
etc., usually connected to a float, which
provides fine adjustment of fluid flow

Atmospheric pressure will allow the
capsule to expand, causing the needle
valve to move into the opening thus
reducing the flow of fuel.
negative negative /ne$ətv/ adjective 1. a
value of less than 0
In a reversing propeller,
the propeller mechanism
includes a removable ground fine pitch
stop which enables the propeller to be
set to a negative pitch. 2. referring to an
electric charge of the same sign as that
of an electron  the negative terminal
of a battery the terminal of a battery
marked with the symbol – and normally
coloured black rather than red 3. showing
refusal  a negative answer no 4.
showing resistance or non-co-operation

a negative attitude
negligible negligible /ne$ld"b(ə)l/ adjective
small or unimportant to the extent that it
is not worth considering
Atmospheric
attenuation is negligible until the upper
end of the UHF (ultra high frequency)
band when it increases rapidly.  negligible
risk almost no risk
neoprene neoprene /niəυprin/ noun a type
of synthetic rubber
net net /net/ adjective after all necessary
deductions
net dry weight net dry weight /net dra wet/
noun the basic weight of an engine
without fluids and without accessories
not essential for the engine to function
network network /netw%k/ noun 1. a complex
interconnected group or system

A network of meteorological stations
around the world exchange information.
2. a system of lines or channels
which cross each other
On a map,
meridians of longitude and parallels of
latitude form a network of lines called a
graticule. 3. a system of computers
interconnected in order to share information
neutral neutral /njutrəl/ adjective, noun 1.
indicating an electrical charge which is
neither positive nor negative 2. indicating
the position of a switch or lever
which leaves a system active but not
engaged, e.g. an engine gear lever position
in which the engine is disconnected
　
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本文鏈接地址：Dictionary of Aviation下(21)