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later stage at a later time 2. a group
components forming part of an electrical
or electronic system
In the axial
flow compressor, many stages of moving
and stationary blades are needed,
each row of rotors and a row of stators
forming a stage.
stagger /st$ə/ noun a design in
which the leading edge of one wing of a
biplane projects beyond that of the
other wing  verb to make the leading
edge of one wing of a biplane project
beyond the leading edge of the other
wing
stall /stɔl/ noun 1. a loss of lift caused
by the breakdown of airflow over the
wing when the angle of attack passes a
critical point
In some configurations it
is possible for the buffet speed to be less
than the required 7% margin ahead of
the stall. 2. a situation in which an
engine or machine stops suddenly
because an opposing force overcomes
its driving power
Compressor stall
can be caused by ice formation in the
air intake.
recovery  verb to lose lift
by the breakdown of airflow over the
wing when the angle of attack passes a
critical point
Many light aircraft stall
when the angle of attack exceeds 15°.

recover
COMMENT: A stall has nothing to do
with the engine stopping. An aircraft
can stall at any airspeed and in any
attitude.
stalling angle stalling angle /stɔlŋ ŋ$(ə)l/
noun the angle relative to the horizontal
at which the flow of air around an aerofoil
changes abruptly, resulting in significant
changes in the lift and drag of
an aircraft
stalling speed stalling speed /stɔlŋ spid/ noun
the speed at which the angle of attack is
such that lift over the wing surface
breaks down
COMMENT: Traditionally, an aircraft
can stall at any airspeed, providing the
angle of attack is great enough.
Stalling speed is often used to refer to
the speed below which the aircraft
cannot remain airborne.
warning system stall warning system /stɔl
wɔnŋ sstəm/ noun a system to
warn the pilot that the aircraft is about
to stall
standard 218
standard standard /stndəd/ noun something,
e.g. a quality or measure, that is
officially recognised as an example that
others must conform with
Water is the
standard for determining relative density.
 a high standard of skill a high
level of skill  adjective normal, officially
or generally accepted  standard
procedure normal procedure
standard atmosphere standard atmosphere /stndəd
tməsfə/ noun a unit of pressure
defined as the pressure that will support
a 760 mm column of mercury at 0°C at
sea level, equal to 1.01325 x 105 newtons
per square metre
standard instrument departure standard instrument departure
/stndən nstrυmənt d|pɑtʃə/
noun a published navigational chart
showing the route an aircraft must take
as it takes off and climbs away from an
airport. Abbreviation SID
standard parallels standard parallels /stndəd
prəlelz/ plural noun (in a conical projection)
the parallels of latitude where
the cone cuts the surface
standard pressure setting standard pressure setting
/stndəd preʃə setŋ/ noun 1013.25
millibars. Abbreviation SPS
standard rate turn standard rate turn /stndəd ret
t%n/ noun a turn made at a precise
number of compass degrees per second
COMMENT: Rate 1 turn = 180 ° in 1
minute, Rate 2 turn = 360 ° in 1 minute,
Rate 3 turn = 540 ° in 1 minute, Rate 4
turn = 720 ° in 1 minute. Standard rate
turns are made using particular angles
of bank for specific airspeeds and are
used while flying under Instrument
Flight Rules (IFR). The pilot can make
accurate turns to given headings by
banking at the standard rate and
timing the turn.
standard time standard time /stndəd tam/
noun a universally adopted time for all
countries based on zone time
standby standby /stndba/ adjective secondary,
able to be used as a back-up

Some aircraft use a ram air turbine that
can be very useful as a standby power
source in the event of failure of a complete
main AC (alternating current)
generating system.
standby ticket standby ticket /stndba tkt/
noun a cheaper air ticket bought just
before departure time
There are no
standby tickets to Montreal.
standing agreement standing agreement /stndŋ ə|
　
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