Dictionary of Aviation下(104)

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seeing, the ability to see
Lightning at
night may cause temporary loss of
vision. 2. what you are able to see
In
low wing aircraft, downward vision
may be limited by the airframe.
visual visual /v"υəl/ adjective referring to
seeing
The instrument landing system
is to provide guidance in the horizontal
and vertical planes to an aircraft on
final approach into a position from
which a safe visual landing can be
made.
visual approach slope indicator visual approach slope indicator
/v"υəl ə|prəυtʃ sləυp ndketə/
noun an arrangement of red and white
lights on each side of the runway touchdown
point to give the pilot information
about the plane’s height on final
approach. Abbreviation VASI
visual control room visual control room /v"υəl kən|
trəυl rum/ the control room in the
tower at an airport. Abbreviation VCR
visual examination visual examination /v"υəl $|
zm|neʃ(ə)n/ noun a close observation
or inspection with the eyes. Also
called visual inspection
visual flight rules visual flight rules /v"υəl flat
rulz/ plural noun rules set down by an
authority for flight in visual conditions,
regarding such things as flight visibility
and distance from cloud. Abbreviation
VFR.
special VFR flight
COMMENT: Particular requirements for
VFR depend on the type of airspace,
time of day, and height above terrain.
visual indication visual indication /v"υəl nd|
keʃ(ə)n/ noun something which is
seen and which suggests a more serious
cause, e.g. a warning lamp
Distorted
wing panels are often a visual indication
of structural damage to the airframe.
visual meteorological conditions visual meteorological conditions
/v"υəl mitiərəlɒd"k(ə)l
kən|dʃ(ə)nz/, visual meteorological
conditions criteria /pə eə tʃɑt/
plural noun all the factors which define
the limits of flying in visual meteorological
conditions. Abbreviation VMC
visual warning visual warning /v"υəl wɔnŋ/
noun a warning that can be seen as
opposed to a audible warning that can
be heard
vital vital /vat(ə)l/ adjective extremely
important
Verbal commands from the
crew are vital at all times but particularly
so if smoke restricts cabin visibility.

Accurate measurements of atmospheric
pressure and the rate of change
of pressure are of vital interest to the
meteorological forecaster.
viz viz /vz/ adverb namely, in other
words, that is to say
There are two
types of inverter, viz rotary and static.
VMC 248
VMC VMC abbreviation visual meteorological
conditions
Vne Vne abbreviation never-exceed speed
volatile volatile /vɒlətal/ adjective describes
a liquid which easily changes into a gas
or vapour
To aid starting in cold
weather, more volatile fuels can be used
volatility volatility /vɒlə|tlti/ noun the ease
with which a liquid changes into a gas
or vapour
With kerosene-type fuels,
the volatility is controlled by distillation
and flash point, but with the wide-cut
fuels it is controlled by distillation and
the Reid Vapour Pressure test.
VOLMET VOLMET /vɒlmet/ noun a routine
ground-to-air broadcast of meteorological
information
The meteorological
Operational Telecommunications Network
Europe (MOTNE) is provided for
the exchange of meteorological information
needed by meteorological
offices, VOLMET broadcasting stations,
air traffic service units, operators
and other aeronautical users.
volplane volplane /vɒlplen/ noun a glide
towards the ground in an aircraft with
the engine turned off  verb to glide
towards the ground in an aeroplane with
the engine turned off
volt volt /vəυlt/ noun the SI unit of electrical
potential
The system requires a
power supply of either 115 volts AC
(alternating current), 28 volts DC
(direct current), or both. Abbreviation
V
voltage voltage /vəυltd"/ noun electrical
force measured in volts
As an
installed battery becomes fully charged
by the aircraft generator, the battery
　
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