S
- safe forced landing
- safety
- safety assurance
- safety data
- safety data collection and processing systems
- safety event
- safety information
- safety management manual
- safety management panel
- safety management system
- safety oversight
- safety performance
- safety performancesafety recommendation
- safety pilot
- safety promotion
- safety recommendation
- safety requirements
- safety risk management
- safety zone
- sailplane
- sandstorm
- sate of design
- satelite fire station
- satellite fire station
- saturation-adiabatic lapse rate
- scheduled air service
- scheduled flight
- scheduled international air service
- schedules facilitated airport
- scheduling season
- screened ignition system
- screener
- screening
- sea-level pressure
- sea glider
- sea gyroplane
- sea helicopter
- sea level engine
- sea level pressure
- sea orhithoper
- sea ornithoper
- seaplane
- second-in-command
- second mean chord
- secondary radar
- secondary surveillance radar
- security
- security checkpoint
- security equipment
- segregated airspace
- segregated parallel operations
- semi-monocoque construction
- semi-rigid airship
- series of slots
- series return deadline
- service ceiling
- servo tab
- set
- severe storm
- severe weather
- severity
- shaft horsepower
- shim
- ship
- shipper
- short-field landing
- short-haul flight
- short approach
- short landing
- shot peening
- shoulder harness
- shower
- shower(s) in the vicinity
- side-slipping
- sideslip
- sidestick
- sidestick controller
- sign
- signal area
- signal letter
- signaling mirror
- signalling mirror
- significant meteorological information
- significant weather
- significant weather chart
- silver storm, glaze storm
- simple approach lighting system
- simple fracture
- single-engine aeroplane
- single-engine aircraft
- single-engine airplane
- single-pilot aircraft
- single-pilot operation
- single acting engine
- single engine airtanker
- sink rate
- sink speed
- sinking speed
- Six's thermometer
- skid
- skidding
- skydiver
- skydiving
- skyjacking
- slat
- slight drizzle
- slipping
- slipstream
- slot
- slot pool
- slot swap
- slow roll
- slush
- small aircraft
- smog
- snaking
- snow accumulation
- snow depth
- snowstorm
- solenoid valve
- solo flight
- sonde
- sonic detection and ranging
- sounding
- sounding balloon
- span
- spar longeron
- spatial disorientation
- special use airspace
- special VFR operations
- specific operating regulations
- speed
- speed brake
- spherical free balloon
- spin
- squall
- squall-line thunderstorm
- squall line
- squally weather
- stability
- stability augmentation
- stability augmentation system
- stabilizer
- stable side position
- staging area
- stall
- stall recovery
- stall recovery\
- stall warning
- stall warning device
- stalling speed
- stand
- standard atmosphere
- standard atmospheric conditions
- standard instrument arrival route
- standard instrument departure
- standard time of observation
- standards and recommended practices
- standing water
- standing wave
- stardboard
- start-of-roll
- starter
- state of design
- state of destination
- State of manufacture
- state of origin
- state of registry
- state of the operator
- State safety oversight
- state safety programme
- static air
- static air temperature
- static port
- static stability
- stationary swash plate
- stationary wave
- stato-jet
- statute mile
- steady initial climb speed
- stealth aircraft
- steep descent
- steep dive
- step climb
- sterile cockpit
- stick
- stick pusher
- stop bar
- stop bar lights
- stop line
- stopbar
- stopping position indicator
- stopway
- stopway edge marker
- storm
- storm warning
- stowaway
- straight-and-level flight
- straight-in autorotation
- stratocumulus
- stratus
- stroke
- strop
- subsonic aeroplane
- substancial damage
- substantial ownership
- summative assessment
- super high frequency
- supercharger
- supercruise
- supercruiser aircraft
- superheat
- supersonic aeroplane
- supersonic aircraft
- supersonic flight
- supplemental oxygen
- supplemental type certificate
- supporting surfaces
- surface irregularity
- surface movement guidance and control system
- surface movement radar
- surface observation
- surface transport
- surface weather observation
- surveillance
- surveillance radar
- sustainable aviation fuel
- sustentación aerodinámica
- swash plate
- swashplate
- sweep back
- sweep forward
- sweep width (W)
- sweepback
- sweepforward
- swept-back wing
- swept-forward wing
- sweptwing
- swing
- swing-wing
- symmetrical airfoil
- SYNOP code
- synoptic chart
- synoptic forecast
- synoptic forecasting
- synoptic hour
- synoptic observation
- synoptic scale
- synoptic situation
- synoptic station
- synthetic vision
- synthetic vision system
- Synthetic Vision System (SVS)
- sypnotic chart