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piston engines.
serviceability serviceability /s%vsə|blti/ noun
the ability to function as required

When carrying out engine checks, it is
usual to turn off the magnetos in turn to
check their serviceability.
serviceable 206
serviceable serviceable /s%vsəb(ə)l/ adjective
able to function as required
The pilot
must make sure that the radio equipment
is serviceable prior to take-off.
service area service area /s%vs eəriə/ noun
area where maintenance and repairs are
carried out
service bay service bay /s%vs be/ noun a
space in the structure of an aeroplane
where equipment can be located for
maintenance or repairs
In most modern
aircraft a number of the major components
are grouped together in a
hydraulic service bay which is easily
accessible for routine servicing operations.
service bulletin service bulletin /s%vs bυltn/
noun a notice issued by the manufacturer
of an aircraft, engine or other
equipment to alert people to problems
with that equipment. Abbreviation SB
servicing servicing /s%vsŋ/ noun the action
of carrying out maintenance and repairs

Accessibility of components and
equipment during servicing enables
work to be done more quickly.
servo servo /s%vəυ/ abbreviation servomechanism
servo-assisted servo-assisted /s%vəυ ə|sstd/
adjective partially operated by a servomechanism

servo-assisted brakes

servo-assisted steering
servo-control unit servo-control unit /s%vəυ kən|
trəυl junt/ noun a unit, a combined
selector valve and actuator, which
moves a control surface
A servo-control
unit is part of the system which
relieves the effects of aerodynamic
forces on the flight controls.
servomechanism servomechanism /s%vəυ|
mekənz(ə)m/ noun a device to convert
input forces into much larger output
forces
Two phase motors are normally
used for very small or miniature
motors in servomechanisms.
set set /set/ noun a group of things which
belong together
a set of instruments

a set of figures  adjective fixed or
established
a set procedure  verb 1.
to adjust to a particular point or figure

The aircraft receiver is set to the
required frequency. 2. to put in a particular
position
Set the throttle fully
closed. 3. to harden
The resin sets.
(NOTE: setting – set)  cold setting
materials materials which do not need
heat to harden
set down set down /set daυn/ verb to land an
aircraft, or land somewhere in an aircraft
setting setting /setŋ/ noun 1. a particular
figure or position which a device is
adjusted to  altimeter setting adjustment
of the sub-scale of the altimeter to
read QFE, QNH, etc. 2. the action of
adjusting a device to a particular position,
etc.
The setting of the altimeter is
done prior to take-off.
settle settle /set(ə)l/ verb to move into a
final position
When wheels are first
fitted to an aircraft, the tyres tend to
move slightly as they settle down on the
rims.
several several /sev(ə)rəl/ adjective a
number of but not many, more than a
few
There are several types of instrument
landing systems (ILS) in use. 
several minutes a number of minutes
severe severe /s|və/ adjective extreme or
intense (NOTE: Generally speaking,
weather conditions can be described
as light, moderate or severe, depending
on the amount or intensity of the condition.)
 severe icing bad icing  severe
turbulence violent turbulence
severity severity /s|verti/ noun the amount,
intensity or seriousness of a condition

When the wind is strong the vertical
currents become quite vigorous with the
resultant increase in the severity of turbulence.
SFAR SFAR abbreviation Special Federal
Aviation Regulation
shade shade /ʃed/ noun 1. intensity or richness
of colour
Shades of colour of the
landscape become lighter in misty conditions.
2. cover or shelter from the sun

Surface air temperature is the temperature
recorded in the shade at a height
just above ground level.
shadow shadow /ʃdəυ/ noun an area which
is not affected by full radiation because
of partial or full blocking of rays by
something between the area and the
　
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