S
- sabotage
- safe forced landing
- safety
- safety alert
- safety assurance
- safety belt
- safety briefing
- safety culture
- safety data
- safety data collection and processing systems
- safety event
- safety harness
- safety information
- safety management
- safety management panel
- safety management system
- safety oversight
- safety oversight assessment programme
- safety performance
- safety performance indicator
- safety performance target
- safety pilot
- safety promotion
- safety recommendation
- safety requirements
- safety risk
- safety risk assessment
- safety risk management
- safety zone
- sailplane
- sand
- sandstorm
- SAR mission co-ordinator
- satellite fire station
- saturation-adiabatic lapse rate
- scheduled air service
- scheduled flight
- schedules facilitated airport
- scheduling season
- scramjet
- screener
- screening
- screening checkpoint
- sea-level pressure
- sea glider
- sea gyroplane
- sea helicopter
- sea level engine
- sea level pressure
- sea ornithoper
- seaplane
- search and rescue (radar) transponder
- search and rescue mission co-ordinator
- search and rescue unit
- seat belt
- seat factor
- seating configuration
- second-in-command
- second mean chord
- secondary radar
- secondary radar system
- secondary surveillance radar
- security
- security checkpoint
- security control
- security equipment
- security inspection
- security restricted area
- segregated airspace
- segregated parallel operations
- selective absorption
- self-harmful behaviour
- semi-monocoque construction
- semi-rigid airship
- semimonocoque construction
- semirigid rotor
- separation
- separation minima
- series of slots
- series return deadline
- serious incident
- serious injury
- service bulletin
- servo control
- servo control input rod
- servo tab
- settling with power
- severe storm
- severe weather
- severity
- shaft efficiency
- shaft horsepower
- shaft power
- shaft power extraction
- shaft seal
- shaft thrust
- shaft turbine
- shallow
- shallow fog
- shear beam
- shear of the wind
- shear pin
- shear resistant beam
- shear vector
- shimmy dampener
- shimmy damper
- shipper
- shock absorber
- shock strut
- shock wave
- short
- short-field takeoff
- short-haul flight
- short approach
- short final approach
- short landing
- short take-off and landing
- short takeoff and landing aircraft
- shot peening
- shoulder belt
- shower
- shower(s) in the vicinity
- shutdown
- side-slipping
- side car
- side facing seats
- sideslip
- sidestick
- sierra
- sign
- signal area
- signal letter
- signaling mirror
- significant meteorological information
- significant safety concern
- significant weather
- significant weather chart
- silver storm
- simple approach lighting system
- simple fracture
- simple touchdown zone lighting
- simple touchdown zone lights
- single-engine aeroplane
- single-engine airplane
- single-pilot aircraft
- single-pilot operation
- sink rate
- sink speed
- sinking speed
- sistema de comunicações e relatório de aeronaves
- situation awareness
- situational awareness
- Six's thermometer
- ski landing gear
- skid
- skid (2)
- skidding
- skiplane
- sky bridge
- sky vault
- sky wave
- skydiver
- skydiving
- skyjacking
- slat
- slaved gyro
- slight drizzle
- slip tank
- slipping
- slot
- slot misuse
- slot pool
- slot swap
- slot transfer
- slotted aileron
- slotted airfoil
- slow hover taxi
- slush
- small aircraft
- small hail
- smoke
- smoke number
- snaking
- snow
- snow accumulation
- snow depth
- snow grain
- snowstorm
- solo flight
- solo flight time
- sonde
- sound transmission coefficient
- sounding
- sounding balloon
- spacing
- span
- spar longeron
- spatial disorientation
- special load
- special use airspace
- special VFR flight
- special VFR operations
- specific operating regulations
- specific range
- speed
- speed brake
- speed of revolution
- speed of sound
- spheri
- spherical free balloon
- spin
- spinner
- spiral
- spiral dive
- spiral glide
- spoiler
- squall
- squall-line thunderstorm
- squall line
- squally weather
- stability
- stabilized approach
- stabilizer
- stabilizer bar
- stabilizing parachute
- stable side position
- stall
- stall recovery
- stall speed
- stall warning
- stall warning device
- stand
- standard arrival chart - instrument
- standard atmosphere
- standard departure chart - instrument
- standard instrument arrival
- standard instrument arrival chart
- standard instrument arrival routes
- standard instrument departure
- standard operating procedures
- standard operational procedures
- standard terminal arrival
- standard terminal arrival chart
- standard time of observation
- standards and recommended practices
- standing water
- standing wave
- stardboard
- start-of-roll
- starter
- starter generator
- state of design
- state of destination
- state of manufacture
- state of origin
- state of registry
- state of the operator
- state safety oversight system
- state safety programme
- static
- static air temperature
- static ceiling
- static discharger
- static stability
- station
- station declination
- stationary swash plate
- stationary wave
- stato-jet
- statute mile
- steady flight
- steady initial climb speed
- steep angle of climb
- steep descent
- steep turn
- step climb
- sterile area
- sterile cockpit
- stick
- stick pusher
- stick shaker
- STOL aircraft
- stolport
- stop bar
- stop bar lights
- stop line
- stopbar
- stopover
- stopping position indicator
- stopway
- stopway edge marker
- storm
- storm warning
- stowage compartment
- stowaway
- straight-and-level flight
- straight-in approach
- straight-in approach IFR
- straight-in approach VFR
- straight-in landing
- straight takeoff
- stratocumulus
- stratus
- stroke
- strop
- structural failure
- subsonic aeroplane
- subsonic aircraft
- super high frequency
- supercharged engine
- supercharger
- superheat
- supersonic aeroplane
- supersonic flight
- supplemental oxygen
- supplemental type certificate
- surface irregularity
- surface movement radar
- surface observation
- surface transport
- surface weather observation
- surveillance
- surveillance radar
- SVS
- swash plate
- swashplate
- sweep back
- sweep forward
- sweep width (W)
- sweepback
- sweepforward
- 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