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from the driven parts 3. indicating the
middle position of a control surface
providing no aerodynamic effect other
than that as part of the wing
After a
turn, the auto-control will return the
ailerons to neutral as the aircraft
returns to straight flight.
neutralise neutralise /njutrəlaz/, neutralize
verb to cancel the effect of
Spillage
from a lead acid battery may be neutralised
by washing with a diluted solution
of sodium bicarbonate.
never-exceed speed never-exceed speed /nevər k|
sid spid/ noun a speed which must
not be exceeded. Also called Vne
(Velocity Never Exceeded)
night rating 156
night rating night rating /nat retŋ/ noun an
additional qualification gained from a
course of training for night flying
nil nil /nl/ noun nothing, zero  nil drizzle
no drizzle
nimbostratus nimbostratus /nmbəυ|stretəs/
noun a cloud forming a low dense grey
layer from which rain or drizzle often
falls
nitrogen nitrogen /natrəd"ən/ noun a colourless,
odourless gas which makes up
four fifths of the Earth’s atmosphere

Some aircraft have high pressure air or
nitrogen bottles provided in the undercarriage
and flap circuits for emergency
lowering. (NOTE: The atomic
number of nitrogen is 7.)
nmnm abbreviation nautical mile
nocturnal nocturnal /nɒk|t%n(ə)l/ adjective
happening or appearing during the night

Because there is a requirement for a
cold ground, a katabatic wind tends to
be nocturnal, but if the slope is snowcovered,
it can also occur during the
day.
no-fly zone no-fly zone /nəυ fla zəυn/ noun
an area over which aircraft, especially
those of another country, are forbidden
to fly
nominal nominal /nɒmn(ə)l/ adjective 1. not
significant or not important  a nominal
increase a very small increase 2.
named, specific
As an installed battery
becomes fully charged by the aircraft
generator, the battery voltage
nears its nominal level and the charging
current decreases.
non- non- /nɒn/ prefix not or no
non-directional beacon non-directional beacon /nɒn da|
rekʃ(ə)nəl bikən/ noun a radio beacon
transmitting a signal by which the
pilot can determine his or her bearing.
Abbreviation NDB
non-essential non-essential /nɒn |senʃ(ə)l/
adjective not necessary
In order to
ensure the shortest possible take-off
run, all non-essential equipment was
removed.
non-return valve non-return valve /nɒn r|t%n
vlv/ noun a valve which allows a
fluid to pass in one direction only
As
the piston moves upwards in the cylinder,
fluid is drawn in through a nonreturn
valve.
non-smoking area non-smoking area /nɒn sməυkŋ
eəriə/ noun an area where smoking is
not allowed
normal normal /nɔm(ə)l/ adjective referring
to something which is usual and is to be
expected  under normal conditions
when everything is as it usually is
normal room temperature normal room temperature
/nɔm(ə)l rum temprtʃə/ noun the
temperature regarded as comfortable
for usual daily activity
north north /nɔθ/ noun compass point 360°,
the direction towards which the magnetic
needle points on a compass
Fly
towards the north.
The wind is blowing
from the north.  north facing
mountain side the face of the mountain
which looks towards the north  adjective
1. referring to areas or regions lying
in the north, referring to the compass
point 360°
the north coast of France
2. the northern part of a region or country

North America  adverb towards
the north
The aircraft was heading
north.
compass, magnetic, true
northbound northbound /nɔθbaυnd/ adjective
travelling towards the north
a northbound
flight
north-east north-east /nɔθ ist/ noun the
direction between north and east
After
take-off, the aircraft turned to the northeast.
 adjective 1. situated in the northeast

the north-east coast of England 2.
blowing from or coming from the northeast

a north-east wind  adverb
towards the north-east
We are heading
north-east.
north-easterly north-easterly /nɔθ istəli/ adjective
1. blowing from or coming from the
　
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本文鏈接地址：Dictionary of Aviation下(22)