SCV SURGE CONTROL VALVE
SD SHUTDOWN
SD SUPPORTING DATA
SD SYSTEM DISPLAY
SDAC SYSTEM DATA ACQUISITION CONCENTRATOR
SDCU SMOKE DETECTION CONTROL UNIT
SDI SOURCE DATA IDENTIFIER
SDN SHUTDOWN
SDN SYSTEM DESCRIPTION NOTE
SEC FLIGHT CONTROL SECONDARY COMPUTER (FCSC)
SEC SECONDARY
SEC SPOILER ELEVATOR COMPUTER
SECT SECTION
SEL SELECT, SELECTED, SELECTOR
SELCAL SELECTIVE CALLING SYSTEM
SENS SENSITIVITY
SERVO HX SERVO FUEL HEATER
SFC SPECIFIC FUEL CONSUMPTION
SFCC SLAT AND FLAP CONTROL COMPUTER
SFE SELLER FURNISHED EQUIPMENT
SG SPECIFIC GRAVITY
SGU SYMBOL GENERATOR UNIT
SHDBL SHEDDABLE
SHED SHEDDING
SHF SUPER HIGH FREQUENCY
SHP SHAFT HORSE POWER
SIC SYSTEM ISOLATION CONTACTOR
SID STANDARD INSTRUMENT DEPARTURE (PROCEDURE)
SIG SIGNAL
SIL SERVICE INFORMATION LETTER
SIL SPEECH INTERFACE LEVEL
SIM SIMULATION
SLFT SEA LEVEL FEET
SLS SEA LEVEL STANDARD (1013.25 HPA)
SLS SIDE - LOBE SUPPRESSION
SLT SLAT
SM SCHEDULED MAINTENANCE
SM STATUS MATRIX
SMP SOFTWARE MANAGEMENT PLAN
SMP SUMP
SMR SCHEDULED MAINTENANCE REPORT
SN SERIAL NUMBER
SNECMA SOCIÉTÉ NATIONAL D'ETUDE ET DE CONSTRUCTION DE MONTEURS D'AVIATION
SNSG SENSING
SNSR SENSOR
SO SHUT OFF
SOL VLV SOLENOID VALVE
SOL SOLENOID
SOTM SYSTEM OPERATION TRAINING MANUAL
SOV SHUT OFF VALVE
SPD BRK SPEED BRAKE
SPD LIM SPEED LIMIT
SPD SPEED
SPEC SPECIFICATION
SPFL SPRING FAILED
SPI ADDITIONAL PULSE FOR IDENT (ATC)
SPIP IDENT PULSE
SPKR SPEAKER
SPL SOUND PRESSURE LEVEL
SPLR SPOILER
44 Aircraft Systems - Abbreviations and Acronyms

SPLY SUPPLY
SPM STANDARD PRACTICES MANUAL
SPS SUNDSTRAND POWER SYSTEM
SQ SQUELCH
SR SERVICE REQUEST
SRM STRUCTURAL REPAIR MANUAL
SRS SPEED REFERENCE SYSTEM
SRS SPEED REFERENCE SYSTEM
SSB SINGLE SIDE BAND
SSC SINGLE STROKE CHIME
SSEC STATIC SOURCE ERROR CORRECTION
SSLC SINGLE SHAFT LOAD COMPRESSOR
SSM SIGN STATUS MATRIX
SSR SECONDARY SURVEILLANCE RADAR
SSTU SIDE STICK TRANSDUCER UNIT
SSV SOLENOID SERVO VALVE
STA APU START TIME
STA STATION
STAB STABILIZER, STABILIZATION
STALL BREAKDOWN OF LIFT, SPEED BELOW MINIMUM SPEED
STAR STANDARD TERMINAL ARRIVAL ROUTE
STARTER ENGINE AIR STARTER
STARTG STARTING
STAT INV STATIC INVERTER
STAT STATIC
STBY STANDBY
STD STANDARD
STD STANDARD (ATMOSPHERIC PRESSURE, 1013.25 HPA, TEMPERATURE 15 °C)
STDBY STANDBY
STEER STEERING
STGR STRINGER
STRG STEERING
STS STATUS
STX START OF TEXT
SV SERVO VALVE
SV SHOP VISIT