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static test
STC
thermometer moving with fluid [or measured after
airspeed is reduced to zero] and thus measuring true
temperature due to random motion of fluid molecules.
Numerically equal to total air temperature corrected for
Mach effect.
static test For aeroplane or other structure, test under
static loads; hence constructor may build ** specimen as
well as fatigue specimen. For some vehicles, usually means
test while fixed in one place.
static 3-D radar Large surface radar with fixed aerial
scanned electronically.
static thrust Thrust of jet engine restrained against
forward motion, especially measured under ISA sea-level
conditions.
static tube That transmitting pressure from static head.
static turn indicator Rare instrument driven by pressure
difference from two modified static heads mounted transversely
at wingtips.
static vent Carefully designed opening in plate aligned
with skin of aircraft which under most flight conditions
senses true static pressure.
static wedge Shallow eminence surrounding static vent
to ensure that the hole is not in the boundary layer.
static wick Device for discharging static electricity from
fine (very small radius) tips of thousands of conductive
wires, braid or graphite particles built into flexible wick
projecting behind trailing edge.
statimeter Instrument for measuring static thrust.
station 1 Dimension measured from * origin locating all
planes along fuselage normal to longitudinal axis, or
along wing normal to transverse axis. Every structural
part, bolt hole, equipment item, door frame and every
other dimensional reference is in form of * number (in US
in inches, elsewhere in mm). Corresponding term for
vertical distances is WL, waterlevel).
2 Fixed base for military, naval, air or research
operations.
3 Airport (esp. staff, facilities and costs); airline usage,
usually adjective only.
4 Planned or actual position of geostationary satellite.
5 Position relative to other vehicles of one vehicle in
group (esp. of aircraft and ships).
6 Location of radio transmitter.
7 Location in gas turbine engine. There is no standard
system. Pratt & Whitney uses AM [ambient] followed by
1 [entry to fan] leading to [eg] 4 for HPT inlet and 4.5 for
HPT exit.
stationary front Front without significant motion over
Earth’s surface.
stationary orbit See geostationary.
stationary reservation Altitude reservation over a fixed
area.
stationary shockwave Shockwave at rest relative to solid
surface.
station box Human interface with intercom and/or
remote radio transmitter/receiver, comprising jack socket,
tuning and other controls; in large aircraft links up to 12
audio (crew) inputs to intercom and com. systems.
station capacity Maximum number of aircraft that can
be handled simultaneously by radio (esp. DME) station.
station costs Airline costs attributed to staff and facilities
at airports.
station ident Ident feature keyed into ILS localizer transmission
at regular intervals, either three (military, two )
letter code or voice.
stationkeeping Ability of vehicle, esp. satellite, to maintain
prescribed orbit or station (most geosynchronous
satellites follow small figure-eight shapes).
station-keeping equipment Small 360° radar scanning
horizontally and used to assist several aircraft to hold
exact formation up to several miles apart (eg for precisely
sequenced air-drops).
stationmaster CO of station, from railway usage, usually
Grp Capt (RAF, colloq.).
station passage Flight directly overhead a station (6),
esp. a point navaid, eg VOR, when ‘to’ becomes ‘from’
and bearings become reciprocals.
station set Selected items of mission-support equipment
prepositioned at designated locations for support of war
or emergency ops (USAF).
station time Time at which crews, pax and cargo are to
be on board military transport ready for take-off (DoD).
station zero Origin of aircraft measurement system
[station (1)] along each axis; for longitudinal axis may be
at or in front of nose.
statistical accelerometer Instrument recording number
of times particular acceleration is exceeded; apparently
synonymous with recording accelerometer.
statistical energy analysis A powerful tool for modelling
the transmission of vibrations, particularly within the
aural range, through complex structures.
stator Fixed part of rotary machine, eg electrical generator
or motor, hydraulic pump, gas turbine compressor or
turbine, RC engine casing or brake discs keyed to landinggear
axle.
stator blade Fixed (except for variable incidence) blade
attached to axial compressor stator casing in radial row
between each stage of rotor blades. US = stator vane.
stator casing That enclosing axial compressor.
stator outlet temperature In most gas turbines gas path
expands through turbine[s] and SOT is higher than TET.
See turbine temperatures.
statorless turbine Designs in which contra-rotating
rotors eliminate need for stators.
stator vane Stator blade, usually abbreviated to vane
(US).
statoscope Instrument (now arch.) for detecting small
excursions from preset pressure altitude. Comprised
sealed U-tube containing drop of red liquid reposing
normally at centre, connected to thermos flask. With a
small bleed, led to VSI.
Status MFD key which returns pilot to basic menu for
complete change of function.
status Assessment of target, esp. one seen only on radar,
as friend, foe or unknown.
statute mile Non-SI unit of length = 1609.344 m.
Stavka Supreme-command staff (USSR).
stay Lateral strut or bracing member, esp. for landing
gear.
STB 1 Stop bars.
2 Systems testbed.
STBA Service Technique des Bases Aériennes (F).
STBL Stable.
STBY Standby, standby instruments.
STC 1 Sensitivity, sensitive, or swept, time constant, or
control.
2 Self-test capability.
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