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spiral descent with the angle of
attack of the mainplane greater than the
stalling angle
It is prohibited to spin
general-purpose light aircraft which
are not equipped with a suitable harness.
COMMENT: The Moroccan aerobatic
team ‘La Marche Verte’ perform a
formation manoeuvre with three
aircraft spinning through multiple
rotations while inverted.
spindle /spnd(ə)l/ noun a pin or bar
which rotates or on which something
rotates
A cup anemometer has three
cups, mounted on a spindle, that are
driven by the wind causing the spindle
to rotate.
spine spine /span/ noun the longitudinal
central part of an engine
Annular
inner and outer air casings form a tunnel
around the spine of the engine.
spinner spinner /spnə/ noun a cap that fits
over the hub of the propeller of an aircraft
spiral spiral /sparəl/ adjective winding
continuously in circles as it ascends or
descends
spiral dive spiral dive /sparəl dav/ noun a
dangerous uncontrolled turning descent
of an aircraft in which rate of descent
and speed increase
spline spline /splan/ noun a groove in a
shaft for meshing or engaging with
another component
split split /splt/ noun 1. a division 2. a
break along a line, especially in wood,
plastic or rubber
a split in a tyre  verb
1. to divide
Retractable undercarriages
can be split into three groups. 2.
to break along a line
One of the tyres
split on impact. (NOTE: splitting – split)
 adjective divided or broken along a
line
split bus system split bus system /splt bs
sstəm/ noun an electrical system in
which there are two separate power
generation systems
The parallel system
and the split bus system are both
used to distribute electrical power.
spoiler spoiler /spɔlə/ noun a hinged surface
on the upper wing which, when
opened, decreases lift and increases
drag
If a problem occurs in the spoiler
system a master caution light illuminates.
COMMENT: Spoilers are sometimes
called ‘speed brakes’. They are used
during the descent prior to landing and
immediately after landing to decrease
lift and increase braking effect.
sponson sponson /spɒnsən/ noun an airfilled
structure or small wing projecting
from the lower hull of a seaplane to
keep it steady on water
spontaneous spontaneous /spɒn|teniəs/ adjective
happening without external cause

Spontaneous ignition may occur if oxygen
is allowed to come into contact with
oil or grease.
spool spool /spul/ noun one complete
axial-compressor rotor
The single
spool compressor consists of one rotor
assembly and stators.  verb  to spool
down to allow the revolutions of a tur-
spot 216
bofan engine to decrease  to spool up
to increase the revolutions per minute of
a turbofan engine
spot spot /spɒt/ noun 1. a special or small
place
Charts should be kept in a convenient
spot in the cockpit. 2. a small
roundish mark or piece
a spot of oil on
a shirt  spot height the height of a particular
place, e.g. a mountain peak,
marked on a chart
spotlight spotlight /spɒtlat/ noun a powerful,
often moveable light which illuminates
a small area
A spotlight is mounted on
the roof.
spray spray /spre/ noun 1. a body of liquid
in fine drops
The generator is cooled
by oil spray delivered by the constant
speed drive section. 2. a container that
sends out liquid in fine drops  verb to
apply or to send out liquid in the form of
fine drops
Some engines have the
coolant sprayed directly into the compressor
inlet, but for axial flow compressor
engines, it is more suitable to
spray the coolant into the combustion
chamber inlet.
spread spread /spred/ noun an extension of
the area covered or affected by something

Measures are taken to prevent
the spread of fire.  verb to extend the
area of something
Strong jets of water
should not be used on a liquid fire as
this may cause the fire to spread.
The
system sprays a quantity of fluid onto
the windscreen, which is then spread by
the wipers. (NOTE: spreading –
spread)
spring spring /sprŋ/ noun 1. a metal device
which, when under tension, tries to
resume its previous position
The pitch
lock piston is held in the forward position
by a spring. 2. the season between
　
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