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S-PLANE
Continuous complex frequency plane; S-plane is used in control systems engineering in the design of control laws See Also: Laplace transform;

S/N
Signal-to-noise ratio

SALS
short approach light system.

SAMPLING FREQUENCY
Rate of a periodic process; 1/T where T is the period; Symbols: f sub s; Typical Units: Hz; Dimensions: 1/Time.

SAR
Search and rescue.

SARP
serial number

SAT
Search and Rescue

SATCOM
Satellite communications system.

SATNAV
Satellite Navigation (generic)

SB
Service Bulletin

SBAS
Space (or Satellite) Based Augmentation System (DGNSS/DGPS/WAAS/EGNOS)

SC
Stratocumulus

SCARECROWS
Flares which British aircrews believed were being used by the Germans to deceive them into believing they were bombers in flames. In fact they were st...

SCHEDULED SERVICE
Transport service operated pursuant to published flight schedules, including extra sections and related non revenue flights.

SCHR„GE-MUSIK
SLANTED MUSIC. Upward firing 20mm cannons used in German night fighters.

SDC
Signal Data Converter

SDU
Satellite data unit.

SE
Single-Engine

SEA LEVEL ENGINE
a reciprocating aircraft engine having a rated takeoff power that is producible only at sea level

SEALION (SEEL–WE)
the planned invasion of Britain in September 1940

SEAPLANE
An airplane that has floats, or pontoons, attached to allow it to land on water.

SEARCH PATTERN
Basic guidance mode; provides lateral steering guidance to fly an expanding square search pattern, creeping line search pattern, or sector search patt...

SECOND IN COMMAND
a pilot who is designated to be second in command of an aircraft during flight time

SECOND-ORDER FILTER.
A smoothing filter in which the output follows the input, only more slowly; It is usually implemented in software as a difference equation of period T...

SECTOR SEARCH
A pattern of concentric arcs followed for searching the ground from an aircraft; Compare: creeping line search, expanding square search;

SEEBURG TISCH
SEEBURG TABLE; Glass screen on which the German night fighter controllers plotted the course of the raid

SEL
Single-Engine Land

SELCAL
Selective Calling system (used primarily with HF)

SELECTED
Measured data picked from one of many sensors; Selecting is the process of choosing the "best" parameter from multiple copies of that parameter, from ...

SELF TEST
A test internal to a device

SEMI-CIRCLE
A measure of angle, 1 semi-circle = pi rad = 180 deg; angles from physical devices are often reported in semi-circles in order to compress data

SENSOR
A device that measures, receives, or generates data, for example, an INS, a FLIR, a map. See Also: Data Source Object

SENSOR FUSION/CORRELATION (SFC)
Measure of convergence of sensor data

SEP
Spherical error probability

SEPARATION MINIMA
The minimum longitudinal, lateral, or vertical distances by which aircraft are spaced through the application of air traffic control procedures.

SERRATE
; RAF airborne radar used to home on the German night fighters` Lichtenstein bomber detection equipment.

SERVICE CEILING
The altitude above sea level beyond which an airplane can no longer climb more than 30 m(100 ft) per minute.

SERVO
The radio component which does the work of moving a control surface.

SERVO OUTPUT ARM
The removable arm or wheel which bolts to the output shaft of a servo and connects to the pushrod.

SFC
Sensor Fusion/Correlation

SFE
Single-Engine Piston

SFTS
Service Flying Training School

SG
Sub-Group (of Euro control Working Groups)

SHIVER
An airborne transmitter used to jam Wìrzburg radar

SHOT DOWN
A "hit" that results in a crash landing. Sometimes caused by radios miles away.

SHOW
unless the context otherwise requires, means to show to the satisfaction of the Administrator

SHP
Shaft horsepower. (refers to turbine engines.)

SHUTDOWN
To cease normal operations

SI
Surveillance Identity (Code) - (Mode S Transponder)

SID
Standard Instrument Departure

SIDESLIP ANGLE
Symbols: beta; Typical Units: rad, deg;

SIGMET
Significant Meteo (hazardous weather warning)

SIGNAL
Part of received data that is desired; Compare: noise, offset

SIGNAL DATA CONVERTER (SDC)
A device that converts unique signals to a standard protocol, usually MIL-STD-1553B; Synonyms: Remote Terminal Unit;

SIGNAL-TO-NOISE RATIO (SNR,S/N)
A ratio of magnitude of a desired signal to the magnitude of the noise received with it; Typical Units: dB;

SIL
Sachplan Infrastruktur Luftfahrt

SILVER CROWN
Trade name owned by King Radio.

SIM
Simulator

SIMPLEX
Single frequency for both transmitting and receiving in communications; generally implies a push-to-talk function and verbal procedures.

SIMULATOR
A computer program which uses a modified radio transmitter, and a graphic depiction of a aircraft and flying area. This is used to give aircraft pilot...

SINGLE SIDEBAND (SSB)
A highly efficient form of radio transmission wherein information is carried on a sideband instead of the center carrier in order to gain range perfor...

SIP
Slot Improvement Proposal Message

SIRO
Simultaneous Intersecting Runway Operation

SITA
Sociİtİ Internationale de Tİlİcommunication Aİronautique

SITUATIONAL AWARENESS
Situational awareness provides the pilots with information relative to the current surroundings, such as other aircraft or threats in the immediate ar...

SL
Sea Level

SLANT RANGE
Direct line distance, not along the ground;

SLATS
Moveable surfaces on the leading edge of the wing that help airflow in low-speed flight. They enable the wing to fly at lower airspeeds than without t...

SLAVED COMPASS
North-seeking gyro-stabilized compass system. Technically superior to DG.

SLIP
A maneuver where the airplane`s controls are used to make the fuselage fly at an angle to the line of flight. This causes a tremendous increase in dra...

SLOP
Slop occurs when a control surfaces movement does not move the servo. Common cause is a worn linkage point or poor linkage setup.

SLOT
A specially-shaped slot in the wing just behind the leading edge. This directs airflow from below to the top of the wing, and helps low-speed flight b...

SLOW ROLL
A very slow version of the roll.

SLP
Speed Limit Point

SM
Statute Mile (1.609 km - ACHTUNG: Nicht See-Meile!)

SMALL AIRCRAFT
aircraft of 12,500 pounds or less, maximum certificated takeoff weight

SMEL
Single/Multi Engine Land

SMGCS
Surface Movement Guidance and Control System

SMGS
Surface Movement Guidance System

SMM
Slot Missed Message

SMOH
Since major overhaul.

SMOOTHED
Data that is the result of conditioning a signal with a simple filter; Compare: derived, estimated, filtered, measured, raw, selected; smoothing is us...

SMOOTHING FILTER
A filter to reduce quick changes of a signal by attenuating high frequencies; See Also: first-order filter, second-order filter, wash-out filter;

SMPI
Time Since Major Periodic Inspection

SMS
Short Message System (Mobile Telephone Feature)

SN
Serial Number

SNAP ROLL
A type of rolling maneuver that is very quick and violent. It`s basically a spin where the flight path is in any direction chosen by the pilot. Improp...

SNR
Signal-to-noise ratio

SOLO
Your first totally unassisted flight that results in a controlled landing.

SOUTH AMERICAN
A standard model for computing earth data

SP
Single Pilot

SPA
Single Pilot Airplane

SPAN, ALSO "WINGSPAN"
The widest straight-line distance between the two wingtips.

SPAR
A principal section of the wing structure of an airplane, going from tip to tip.

SPECI
Special Report (Meteo)

SPECIAL USE AIRSPACE (SUA)
Airspace of defined dimensions identified by an area on the surface of the earth wherein activities must be confined because of their nature and/or wh...

SPECIAL VFR CONDITIONS
meteorological conditions that are less than those required for basic VFR flight in controlled airspace and in which some aircraft are permitted fight...

SPECIAL VFR OPERATIONS
aircraft operating in accordance with clearances within controlled airspace in meteorological conditions less than the basic VFR weather minima. Such ...

SPEED
Scalar velocity;

SPEED BRAKES
Large panels that fold out of the aircraft structure to provide a lot of extra drag to the air. They are not part of the wing structure, but are usual...

SPEED CUE
Flight director cue to control speed; in fixed-wing aircraft, a throttle cue; in rotary-wing aircraft, a longitudinal cyclic cue

SPEED ERROR
A basic output from guidance to flight director, indicating the difference between actual speed and desired speed; Symbols: DELTA V; Typical Units: ft...

SPERRY
Avionics mfr

SPH
Single Pilot Helicopter

SPHERICAL ERROR PROBABILITY(SEP)
A probability that a percentage of three-dimension measurements will lie within a sphere of given radius, with the sphere centered at truth or mean of...

SPIC
Student Pilot in Command (JAR-FCL)

SPIN
A maneuver where one wing is stalled and the other is still flying. This causes the airplane to rotate around its middle while it descends at a high r...

SPINNER
The bullet-shaped fairing on the nose of the airplane around the propeller. This smoothes the airflow around the propeller hub and also makes the airp...

SPLIT-S
Basically a reverse Immelmann. The airplane rolls onto its back, and then the nose comes down to finish a 1/2-loop. The direction of flight is changed...

SPOH
Since prop overhaul.

SPOILER
A control surface on fixed-wing aircraft, usually mounted to the wings, that provides roll control and lift; Symbols: delta sub S; Typical Units: rad,...

SPOILER(S)
Control surfaces on the wing that destroy lift. They "spoil" it. They are used on sail-planes because they can steepen the very flat glide of the airc...

SQUAWK
A 4-digit (actually 4-octal-digit -

SQUITTER
The transmission of a specified reply format at a minimum rate without the need to be interrogated (transponders)

SR
Sunrise

SRJ
Slot Improvement Proposal Rejection Message

SRR
Slot Revision Request Message

SRS
Standard Routing Scheme (ARN)

SS
Sunset

SSALS
simplified short approach light system.

SSALSR
simplified short approach light system with runway alignment indicator lights.

SSCVR
Solid state cockpit voice recorder.

SST
Slot Start Time

STA
Scheduled Time of Arrival

STAB
Horizontal stabilizer, "smaller wing"

STABILITY COORDINATES
Coordinates referenced to the air mass; Compare: body coordinates, earth coordinates;

STABILIZER
A surface which increases the stability of a aircraft. Most aircraft have two stabilizers, the horizontal (stab) and vertical (fin), which are mounted...

STAFFEL
Luftwaffe equivalent to a squadron.

STAGNATION PRESSURE
Total pressure

STALL
When the air flowing over the wing cannot produce enough lift to support the weight of the aircraft, it`s called a "stall". This can happen if the air...

STALL TURN
The maneuver in which the aircraft is flown to a point at which the main wing is vertical, stalls, then is turned about the yaw axis to continue in a ...

STANDARD ATMOSPHERE
the atmosphere defined in U.S. Standard Atmosphere, 1962 (Geopotential altitude tables)

STANDARD RATE TURN
A turn of three degrees compass heading per second.

STANDARD UNITS
Units commonly encountered for a particular quantity;

STAR
Standard Arrival

STARBOARD
Nautical usage adopted in aviation. The right side, as determined by an observer in the vehicle, when vehicle and observer are right side up, and obse...

STATE DATA
Data that defines aircraft parameters, such as position, velocity, attitude; Some standard terms for state data include: Groundspeed vector, wind spee...

STATE-SPACE MODEL
A mathematical relationship of a system in time using state variables, inputs, outputs, and constants; The state-space model is composed of n state va...

STATIC PRESSURE
A measure of barometric pressure as if the sensor were not moving with respect to the air; Compare: total pressure; Symbols: p sub s; Typical Units: p...

STATION
A structure on the ground, perhaps containing VOR or TACAN

STATUS
An indicator of how well a system or subsystem is working

STATUS INDICATOR
An binary indicator of a particular aspect of a device; status indicators are independent of each other; status indicators listed in this dictionary a...

STATUS WORDS
Data words reported by devices to indicate status; Each bit is defined on a device-by-device basis. The number of words vary from device to device. St...

STC
(1) Supplemental Type Certificate. (2) Sensitivity-time compensation. In weather radar, a technique and circuit for calibrating a display.

STD
Supplemental Type Certificate

STDMA
Self-Organizing Time Division Multiple Access (VDL)

STICK
A control in the cockpit which controls the elevators (forward/back axis) and the ailerons (left/right axis).

STOL
Short takeoff and landing ability.

STOP WAY
an area beyond the takeoff runway, no less wide than the runway and centered upon the extended centerline of the runway, able to support the airplane ...

STRAP DOWN INERTIAL SENSOR
Accelerometers mounted to a platform fixed to the aircraft; Compare: gimbaled inertial sensor

STRUT
Basically this is a supporting member. A wing strut supports the wing, and goes from the fuselage to the wing. Cabane struts are on biplanes, and supp...

SUA
Special Use Airspace (USA)

SUB-TRIM
This is a trim function on many computer radios, allowing trim function during set-up, and still allowing the full trim function in flight.

SUMPS
Points underneath each fuel tank to test for contamination like water or other debris.

SUN
Sunday (MON-TUE-WED-THU-FRI-SAT-SUN-HOL)

SUPERCHARGED
Method for increasing engine power.

SURFACE
Related to surface of water;

SURVIVABILITY
A survivability subsystem detects and counters hostile actions.

SVFR
Special VFR

SWASH PLATE
A device to control the pitch of rotors; on rotary-wing aircraft, the swash plate is controlled by a collective and a cyclic; Surface Wind Wave Motion...

SWC
Significant Weather Chart

SWEPT-WING
A wing in which both the leading and trailing edges are slanted backward, to reduce air resistance at high speed.

SWM
SIP Wanted Message

SYNCH
Engine Fan Synchronizer

SYNCHRO
Any device capable of converting mechanical position into an analog electronic signal.

SYNTHESIZER
Frequency synthesizer, an electronic circuit capable of generating multiple frequencies from a single crystal oscillator.

SYSTEM
Applied to measurements, means the best value that the system can determine.

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