1Dk4eXg

STCA
3 Supplemental Type Certificate (US).
4 Satellite test centre.
5 Short-term confict (A adds alert).
6 Strike Command (RAF).
STCA 1 Short-term collision-avoidance.
2 Short-term conflict-alert.
STCICS Strike Command integrated communications
system (RAF).
STCM Stabilizer-trim control module.
STCR System test and checkout report.
STD 1 System technology demonstration, or description.
2 Scheduled time of departure.
3 Standard, as in next.
STD bus Traditional US-developed 8-bit bus for
computers and related EDP.
STDBY Standby (alternative).
STDMA Space, or synchronized, time-division multiple
access.
STDN Space- [flight] tracking and data network.
STDY Steady.
STE 1 Sun-tracking error.
2 Synthetic training equipment.
3 Scheduled time en-route.
4 Send, then encrypt.
STEADES, Steades Safety trend evaluation analysis
and data-exchange system (IATA).
Steady Air-intercept code: “I am on prescribed
heading”, or “Straighten out on present heading”.
steady flow See time-invariant flow.
steady initial-climb speed See V 4 .
steady-state condition One that is time-invariant, as
applied to signal or flutter amplitude, physical or chemical
properties or any other variable.
stealth Technology for making tangible objects, initially
aircraft, as invisible and undetectable as possible. It covers
all EM wavelengths as well as sound, and is increasingly
essential for survival in defended airspace. Also adjective.
steam bombing Visual manual attack on target of opportunity
using free-fall bombs, especially by advanced
automated aircraft (colloq.).
steam catapult Catapult.
steam cooling Cooling piston engine by allowing slightly
pressurized water to boil in cooling jackets, to be
condensed in dragless double-skin radiator. Also called
evaporative cooling.
steam gauge Traditional dial instrument, especially one
in a modern cockpit (colloq.).
steam(ing) fog Forms when supersaturated freezing air
with inversion moves over warm water; also called Arctic
smoke or sea smoke.
Stears Stand-off tactical electronic airborne reconnaissance
system.
STE bus New international standard 8-bit computer bus
originally developed for Eurocards which has rendered
STD obsolete.
STEC Solar/thermal energy conversion.
STED Space Test and Evaluation Directorate (USAF).
steel drag chute Reverser (colloq.).
steep approach 1 That adopted by helicopter pilot
descending into obstructed, eg urban, heliport, begun at
9 m/200 ft above selected landing spot and made straightin
at close to 50° from downwind.
2 For aeroplanes with limited STOL capability, on an
step pad
individual airport basis; usually 5.5°. To achieve this certification
it is usually necessary to demonstrate 7.5°.
steepest-descent method Basic method of optimization
in which all contour lines (each representing a plotted
variable) are crossed perpendicularly.
steep gliding turn Steep turn performed in glide, if
continued resulting in tight spiral (more common in US).
steep turn Various definitions with bank angles: over
50°; 45°-70°; over 60°.
steerable nosewheel[s] Self-explanatory, a nose landing
gear which can be steered from the cockpit, as distinct
from castoring.
Stefan-Boltzmann constant That in Stefan-Boltzmann
law, σ = 5.66961 [some authorities cite 5.67051] ×
10 -8 W/m 2 K 4 .
Stefan-Boltzmann law Basic law of thermal radiation:
total radiation from black body is proportional to 4th
power of absolute temperature, E = σT 4 .
STEI Service Technique de l’Electronique et de
l’Informatique (F).
stellar guidance See astronavigation.
stellar/inertial guidance Inertial navigation intermittently
updated and refined by astro.
Stellite Large family of hard alloys of Co (30-80%), Cr
(10-40%), W (0.25-14%) and Mo (0.1-5%), and in one case
with 30% Ni and 5% Fe. Some cannot be machined;
common use is piston-engine valve heads and seats.
St Elmo’s fire See corona discharge.
Stem 1 Shaped-tube electrolytic machining, see *
drilling.
2 System (or spaceflight) trainer and exercise module.
3 Space-to-Earth missile concept.
stem Strong quasi-vertical member at bow of marine
aircraft.
stem drilling Use of titanium tool [cathode] feeding 20%
HNO 3 into workpiece; can produce holes 0.5 mm, 0.02
in, diameter and length 120 mm, 4.7 in, see capillary.
Step, STEP 1 Software test and evaluation project,
concerned with entire software life cycle.
2 Standard equipment package.
3 MFD key which pages through all available formats,
usually at 1 Hz.
4 Standard for the exchange of product model data.
step 1 Segment of climb from one FL to next, each
normally begun either on ATC clearance or upon arriving
at suitable gross weight from burning fuel.
2 Sharp or angled discontinuity in planing bottom
(float or hull) to improve planing characteristics and ease
takeoff.
3 Stage (1), latter being preferable.
step-aside gearbox One in which input and output shafts
are not co-axial. In particular, a gearbox inserted on the
compressor casing of a large turbofan to transmit the
drive from the 90° radial shaft inside the core diagonally
to the external gearbox on the fan case.
step climb Gaining altitude in a series of steps, each
accurately flown to minimize fuel burn and comply with
ATC. Abb. STEPCLB.
step cruise Protracted stepped climb covering most of
flight.
step pad Secondary structure built externally on top of
fuselage, esp. of helicopter, for ground crew or other
persons.
657