Dictionary of Aviation下(75)

曝光台 注意防骗 网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者

waves tend to pass through the
layers of the ionosphere into space.
span span /spn/ noun the distance
between two points
spar spar /spɑ/ noun the main longitudinal
beam of an aircraft wing
Designing a
wing skin, a rib or a spar as a single big
item rather than assembling it from
many smaller components minimises
the number of structural parts.
spark spark /spɑk/ noun a light produced
by a sudden electrical discharge  verb
to suddenly start a process or action

Crew must quickly establish control to
ensure panic does not spark a premature
evacuation.
spark plug spark plug /spɑk pl$/, sparking
plug /spɑkŋ pl$/ noun a device
screwed into each cylinder head in
spark ignition engines, which initiates
fuel combustion by an electric spark.

air gap. Also called sparking plug
spat spat /spt/ noun a streamlined covering
for a wheel fitted on a light aircraft
to reduce drag. Also called wheel fairing
spatial disorientation spatial disorientation noun a situation
of bad visibility and/or unusual
manoeuvres which result in the pilot not
knowing what attitude the aircraft is in
speaker speaker /spikə/ noun  loudspeaker
special special /speʃ(ə)l/ adjective particular,
specific, or not ordinary
To make
a composite, it is necessary to combine
the reinforcing glass fibres with some
form of special glue.  noun a special
meteorological report
special aerodrome report special aerodrome report
/speʃ(ə)l eərədrəυm r|pɔt/ noun
report used if there are significant
weather changes since the last meteorological
aerodrome report. Abbreviation
SAR
special VFR flight special VFR flight noun a controlled
VFR flight permitted by air traffic
control to fly within a control zone in
meteorological conditions below visual
meteorological conditions
specific specific /spə|sfk/ adjective clearly
defined and definite
Flight levels are
specific pressure altitudes.
The airframe
has to be built to very specific
requirements.
specification specification /spesf|keʃ(ə)n/
noun a detailed description that sets out
what something consists of, what is
needed, what is involved, etc.
Fluids
are coloured for recognition purposes
and fluids of different specifications
must never be mixed.
specific gravity specific gravity /spə|sfk
$rvti/ noun the density of a substance
compared with that of water,
which is 1.00 (NOTE: This is the old
name for relative density.)
specify specify /spesfa/ verb to name in
detail
The minimum values for decision
heights are specified by the
national licensing authorities for various
types of aircraft and for various airports.

Pressure must be maintained
within specified limits during all phases
of flight.
specimen specimen /spesmn/ noun a part
taken as an example of the whole
By
testing specimen structures and components
to destruction a safe life can be
assessed for all such structures and
components.
speed speed /spid/ noun the rate of motion
over a distance in time
215 spool
sphere sphere /sfə/ noun an object in the
shape of a ball
The Earth is not a perfect
sphere.
A circle drawn on the surface
of a sphere, whose plane passes
through the centre of the sphere is
called a great circle.
spherical spherical /sferk(ə)l/ adjective
shaped like a sphere
The Earth is
almost spherical in shape.
Drain
cocks are generally simple, manually
operated spherical valves.
spill spill /spl/ noun the running out of a
liquid from a container, especially when
it is unintentional
an oil spill
a fuel
spill  verb to cause liquid to run out of
a container, usually unintentionally
If
fuel is spilt, it creates a fire hazard.
(NOTE: spilling – spilled or spilt)
spillage spillage /spld"/ noun the spilling of
a liquid
Any fuel spillage must be
cleaned up immediately. (NOTE: The
word spillage is used in a more general
sense than the word spill.)
spin /spn/ noun 1. fast rotation
the
spin axis of the earth 2. the continued
spiral descent of an aircraft where the
angle of attack of one wing is greater
than the stalling angle  verb 1. to rotate
rapidly
The Earth is spinning on its
axis. 2. to put an aircraft into a continued
　
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