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conditions important to the safety of all
aircraft, such as severe or extreme turbulence.
Abbreviation SIGMET
significant points significant points /s$nfkənt
pɔnts/ plural noun geographical positions
used in air navigation, which are
defined by latitude and longitude and
have names consisting of five letters
significant weather chart significant weather chart /s$|
nfkənt weðə tʃɑt/ noun a weather
chart with important weather information
marked on it
signify signify /s$nfa/ verb to indicate, to
suggest, to mean
Buffet signifies the
approach of a stall. (NOTE: signifies –
signifying – signified)
silence silence /saləns/ noun the absence of
sound  total silence the complete
absence of sound  verb to stop, or stop
something, making a noise
When an
engine fire warning is received on the
flight deck, the first action should be to
silence the warning bell.
silencer silencer /salənsə/ noun a device to
reduce noise
In order to reduce the
level of noise from the blower, silencers
are incorporated in the main supply
ducting.
similar similar /smlə/ adjective nearly the
same
Turbo-shaft engines are similar
to turboprop engines.
similarity similarity /sm|lrti/ noun the fact
of having features that are nearly the
same
There are points of difference
and similarity between the two aircraft.
simple simple /smpəl/ adjective 1. basic,
not complex
A simple fuel system consists
of a gravity feed tank, a filter, a
shut-off valve and pipes. 2. easy
a
simple question
simplicity simplicity /sm|plsti/ noun the
quality of having a basic, uncomplicated
design or concept
Because of its
lightness, cheapness and simplicity, a
fixed pitch propeller is often fitted to
single-engine aircraft.
simplify simplify /smplfa/ verb to make
easy, to make less complex or complicated

Repair procedures are being
further simplified by increasing use of
cold setting resins.
simulate simulate /smjυlet/ verb to imitate
the conditions or behaviour of something

The computer program simulates
the action of an aircraft.
simulated instrument flight simulated instrument flight
/smjυletd nstrυmənt flat/ noun
an instrument flight carried out in a simulator
on the ground or in a specially
prepared aircraft with screens on the
windows
simulation simulation /smjυ|leʃ(ə)n/ noun an
imitation of a real situation, created
often for training purposes
a simulation
of an engine fire
The computer
animation showed a simulation of the
events which followed the explosion on
board the aircraft.
simulator simulator /smjυletə/ noun a
machine that is constructed to look like
an aircraft cockpit with a full set of
instruments, in which people can be
trained to fly a particular type of aircraft
simultaneous simultaneous /sm(ə)l|teniəs/
adjective happening at the same time

Most aircraft are now fitted with remote
magnetic indicator displays which can
be selected to show two simultaneous
bearings from different radio navaids.
sine sine /san/ noun a trigonometric function
defined as the length of the side
opposite to an angle in a right-angled
triangle divided by the length of the
hypotenuse. Abbreviation sin
single single /sŋ$(ə)l/ adjective one only
single-engined aircraft single-engined aircraft /sŋ$(ə)l
end"n eəkrɑft/, single-engine aircraft
noun an aircraft with one engine
only
sink sink /sŋk/ noun a downdraught of air
 rate of sink the rate of descent of a
glider
In order to achieve a safe landing,
a glider has to be controlled so that
it makes contact with the runway
smoothly at a very low rate of sink. 
verb to move downwards as in a fluid

If water enters the fuel tank, it will sink
to the bottom of the tank where it can be
drained off.
sit sit /st/ verb to be resting with your
behind on a seat such as a chair
The
site 210
pilot sits in the cockpit. (NOTE: sitting –
sat)
site site /sat/ noun a selected area of land
　
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本文鏈接地址：Dictionary of Aviation下(70)