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vary vary /veəri/ verb to change, to be different

The tropopause over the UK
can vary between 25,000 feet and
45,000 feet according to whether the
country is covered by a polar or tropical
air mass.
VASI VASI abbreviation visual approach
slope indicator
vast vast /vɑst/ adjective large, immense,
huge  the vast majority most
the
vast majority of people
VCR VCR abbreviation visual control room
VDF VDF abbreviation very high frequency
direction-finding
vector vector /vektə/ noun 1. a quantity
with magnitude and direction indicated
by a line of a given length, representing
magnitude and specific direction
The
triangle of velocities is a vector solution
of what happens to an aircraft when
wind causes drift. 2. a heading given to
a pilot to provide navigational guidance
by radar
Wind velocity is indicated by
a vector, identified by a single arrow,
pointing in the direction the wind is
blowing towards.
veer veer /və/ noun the shifting of the wind
in a clockwise direction in the northern
hemisphere
The passing of a weather
trough is marked by a sharp veer in the
direction of the wind.  verb 1. to
change in a clockwise direction in the
northern hemisphere
Winds veer and
increase with height ahead of a warm
front. Opposite back 2. to change direction,
especially as in an uncontrolled
movement
The aircraft veered off the
runway into the grass.
velocity velocity /və|lɒsti/ noun the rate of
change of position in a given direction
which is composed of both speed and
direction
wind velocity
The anemograph
gives a continuous recording of
wind velocity which is displayed on a
chart and reveals gusts, squalls and
lulls.
triangle
vent /vent/ noun a hole serving as an
inlet or outlet for a fluid, usually a gas
such as air
During the pre-flight
inspection, check that the fuel tank vent
pipe is not blocked.
The vent/pressurisation
system must allow for the passage
of air whenever a fuel tank is refuelled
or defuelled or the aircraft climbs
or descends.
ventilate ventilate /ventlet/ verb to cause air
to pass in and out freely
The water
separator is installed downstream of
the cold air unit to extract a percentage
of free moisture from the air, which subsequently
ventilates and pressurises the
cabin.
ventilation ventilation /vent|leʃ(ə)n/ noun
free circulation of air in and out
A
constant supply of air for ventilation
purposes is always available from the
air conditioning system.
venturi /ven|tjυəri/, venturi tube
noun a tube which narrows at the centre,
a choke tube
When the temperature
of the air passing through the carburettor
is reduced below O°C
(Celsius), any moisture in the air forms
verification 246
into ice and builds up on the venturi and
throttle valve.
verification verification /verf|keʃ(ə)n/ noun
an act or instance of establishing the
truth or validity of something
The
document required verification.
versus versus /v%səs/ preposition against,
as compared with
The diagram illustrates
typical strength properties by
plotting applied stress versus resulting
strain.
vertical vertical /v%tk(ə)l/ adjective at right
angles to the Earth’s surface or to
another line or plane
Beams can be
additionally stiffened in a downward
direction by vertical and diagonal
members.
Height is defined as the vertical
distance of a level, point or object,
considered to be a point, from a specified
datum.  noun a vertical line or
plane
The hot rod ice detector head
consists of an aluminium alloy oblong
base on which is mounted a steel tube
detector mast, angled back to approximately
30° from the vertical.
vertical axis vertical axis /v%tk(ə)l kss/
noun 1. an imaginary line running
through the fuselage at the centre of
gravity from top to bottom, around
which the aircraft rotates when it yaws

The rudder is a control surface on the
fin which rotates the aircraft about its
vertical axis to produce yaw.
yaw 2. a
vertical reference line (Y axis) of a
graph
The vertical axis shows engine
power available.
vertically vertically /v%tk(ə)li/ adverb in a
vertical position
The aircraft pitched
up vertically.
vertical speed indicator vertical speed indicator
　
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本文鏈接地址：Dictionary of Aviation下(102)