Dictionary of Aviation下(83)

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considerable, important  substantial
damage a lot of damage  substantial
increase a big increase
subtend subtend /səb|tend/ verb to be opposite
to and delimit
The angle subtended
by an arc equal to one 360th
part of the circumference of a circle is
called 1° (degree).
subtract subtract /səb|trkt/ verb to deduct
or to take away
6 subtracted from 10
equals 4 (10 – 6 = 4).
subtraction subtraction /səb|trkʃən/ noun the
operation of taking away or deducting

The major arithmetic operations are
addition, subtraction, multiplication
and division.
subtropical subtropical /sb|trɒpk(ə)l/ adjective
referring to the areas between the
tropics and the temperate zone
In winter,
the subtropical high retreats and
gives way to cyclonic pressure patterns.
sub-zero sub-zero /sb zərəυ/ adjective
below zero degrees
In sub-zero conditions
sublimation will occur when air is
cooled below the frost point, producing
a deposit of ice crystals.
success success /sək|ses/ noun the achievement
of something wanted
The key to
223 sun
success in navigation is pre-flight planning.
successful successful /sək|sesf(ə)l/ adjective
satisfactory, as wanted
His second
attempt at landing was successful.
succession succession /sək|seʃ(ə)n/ noun the
process of following in a particular
order
A succession of minor incidents
created a more serious situation.
successive successive /sək|sesv/ adjective
following one after the other without
interruption
All aircraft remained
grounded for three successive days
because of fog.
A day is the period
between successive transits of a meridian
by the sun.
such such /stʃ/ adjective 1. of this kind

An example of such a chart is shown on
page 3. 2. of a large enough extent or
amount
The height of the cabin floor
to the ground on large jet transports is
such that serious injuries can occur by
exiting through the doors when steps or
ramps are not available.
suction suction /skʃən/ noun a force that
causes a fluid or solid to be drawn into
a space because of the difference
between the external and internal pressures

In a fuel injection system, fuel is
induced into the inlet port or combustion
chamber by a pump rather than the
suction caused by the venturi of a carburettor.
sudden sudden /sd(ə)n/ adjective immediate
and without warning
a sudden
change or sudden drop in temperature
suffer suffer /sfə/, suffer from verb to be
affected by, to experience
Piston
engines suffer from icing in moist air
when the ambient air temperature is
well above 0°C (Celsius).
sufficient sufficient /sə|fʃ(ə)nt/ adjective
enough
During pre-flight checks, the
pilot must ensure that there is sufficient
fuel for the flight.
suffix suffix /sfks/ noun an addition to the
end of a word creating a new word

Apart from cirrus and stratus, which are
complete names, all layer cloud names
consist of a prefix according to height of
base, and a suffix according to shape.
(NOTE: In the word cloudless, -less is
the suffix meaning without.)
suggest suggest /sə|d"est/ verb 1. to indicate
a possibility
A strong cloud echo on
radar suggests that hailstones are
present. 2. to mean, to imply
Heap
clouds, as the name suggests, often have
great vertical extent.
suit /sut/ verb to meet the requirements
of
On some engines, the ignition
can be varied as the engine is running
and is moved to suit the engine
speed and load.
suitable /sutəb(ə)l/ adjective appropriate
or right for a particular purpose

Taking into account the limits imposed
by aircraft performance, a suitable
route must be chosen.
sulfur /slfə/ noun US same as sulphur
sulphur sulphur /slfə/ noun a yellow nonmetallic
chemical element
Turbine
fuels tend to corrode the components of
the fuel and combustion systems mainly
as a result of the sulphur and water content
of the fuel. (NOTE: The atomic
number of sulphur is 16.)
sum /sm/ noun the result of two or
more numbers added together
When
the component velocities act in the
same direction, the resultant velocity is
equal to the sum of their speeds in that
direction.
summarise summarise /sməraz/, summarize
verb to present something in a
　
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