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Sucsede
Sucsede Successful user-centered systems engineering
development and environment (software tools).
suction Withdrawal of fluid through a region of local
depression.
suction-cup gun Spraygun using ejector effect to withdraw
medium.
suction face That side of propeller blade, normally facing
forward, formed from upper surface of its aerofoil. See
suction surface.
suction flap Not normal term; in some cases means blown
flap.
suction gauge Instrument measuring pressure below
atmospheric, usually by aneroid or bourdon tube.
suction gyro Gyro whose rotor is driven by atmospheric
air jets trying to fill evacuated case.
suction line The pipe upstream of a fluid-system pump.
suction stroke Induction or inlet stroke.
suction surface The convex face of a gas-turbine rotor
blade or propeller.
suction wing 1 One whose boundary layer is continually
sucked away by powered suction system.
2 Wing of deep section with upper rear discontinuity
from which large airflow is removed by suction to maintain
attached flow (rare after 1949).
SUD Stretched upper deck.
sudden ionospheric disturbance Abnormal behaviour of
ionosphere following passage of radiation travelling at
speed of light from source of solar flare, affecting Earth’s
sunlit face. Gradual return over following hour or more.
sudden pull-up Basic stressing case in which severe
positive g is applied by violent nose-up elevator command
(US term).
sudden stoppage Inflight stoppage of piston engine apparently
within about one turn of propeller, or of turbine
within about one second; indicative of severe internal
damage.
Sudec Supervisory digital electronic control, less
authority than Fadec.
SUEM Spin-up and ejection mechanism (Mars lander).
suite Aggregate of all equipments, not necessarily integrated
or forming a common system, of similar general type
carried in vehicle. Especially favoured in connection with
ECM, for which as many as 14 separate electronic equipments
may be carried (and in theory operated
simultaneously) though most are linked only through
common power supplies and possibly cockpit displays. For
GA avionics * is supplanting ‘fit’.
SUL Yaw-damper servo-actuator.
sulfate Salt or ester of sulfuric acid.
sulfated Condition of lead/acid battery after prolonged
discharge; lead sulfate plates cannot be restored by
charging.
sulfidation corrosion Accelerated metallic corrosion due
to sea salts in atmosphere.
sulfide Compound of sulfur with element or radical.
sulfur S, former UK names brimstone and then sulphur,
important in many kinds of compound in several forms,
commonest being yellow crystalline, density 2.1, MPt
113°C.
SUM 1 Surface-to-underwater missile.
2 Structural-usage monitor.
3 System user module.
4 Scheduled unit maintenance (DARA).
superblock
sumerian cobalt One of many cobalt-steel materials used
for permanent magnets.
summer solstice Point on ecliptic, or time thereof, at
which Sun reaches maximum N declination; about 21 June.
summing gear Differential gears which add or subtract
motions of two members.
summing unit Device whose output is sum of inputs; can
be mechanical, fluid flow (including pneumatic logic) or
electronic.
sump Low region of fluid (liquid) system where liquid
tends to collect by gravity. In piston engine bottom of
crankcase, which in wet-* engine also serves as oil tank. In
fuel tank lowest point with tank in normal attitude, where
water collects and may be drained.
sump jar Container in vent line from battery box in which
alkaline chemicals neutralize battery-charging gas.
Sums, SUMS 1 Shallow underwater missile system.
2 Structural-usage monitoring system.
SUMT Sequential unconstrained minimization technique.
Sun Apparent diameter (optical) 13.92 × 10 8 m, mean
density 1.41 g/cm 3 , mass c 1.99 × 10 30 kg, surface gravity
274 ms -2 (26.9g), rotational period c 25.4 days at Equator
(33 at 75°N/S lat), radiating surface temperature 5,800K,
chromosphere up to c 10 6 K, emits various corpuscular and
EM radiation at total energy c 3.39 × 10 26 Js -1 ; moving with
solar system through interstellar medium in local arm of
galaxy at c 20 km s -1 . See solar wind.
Sun compass Compass based on az/el of Sun, formerly
used near magnetic poles where magnetic compass unreliable.
Sundstrand drive Infinitely variable hydraulic CSD.
sun gear Central gearwheel in planetary reduction gear.
sunk costs Costs incurred in development which are paid
off in another programme.
sunlight-readable Readable in illumination (illuminance)
of 10 4 lx; basic requirement of military cockpit warning
panels and displays.
SunRez Proprietary resin activated [set hard] by UV light.
Sun-synchronous See heliosynchronous.
SUO 1 Small unit operations.
2 Aileron/elevator/rudder servoactuator.
SUP 1 Smart upgrade procurement.
2 Supplement to publication.
3 Suspected unapproved part[s] (FAA).
Supaéro Ecole National Supérieure de l’Aéronautique et
de l’Espace [Toulouse F-31055] (F).
Suparco Space and Upper-Atmosphere Research
Commission (Pakistan).
superadiabatic lapse rate Greater than DALR, such that
potential temperature decreases with height.
superaerodynamics Aerodynamics involving such high
relative velocities and such low densities that body has
passed before air molecules can collide with others and
exchange energy; also called free-molecule flow and
Newtonian aerodynamics, and akin to MHD flow.
superalloy Any alloy designed for extremely severe conditions,
esp. at very high temperatures.
superaugmentation Either of two methods of achieving
gains in flight performance by imparting artificially stable
flight characteristics to aeroplanes that are inherently
unstable.
superblock Major section (20%) of CVF, each assigned to
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