delayed meteorological messages)
RTF Radiotelephone
RTG Radiotelegraph
RTT Radioteletypewriter
RUT Standard regional route transmitter frequencies
RV Rescue vessel
RVR Runway visual range
RWY Runway
S
S South or southern latitude
SA Duststorm, sandstorm, rising dust or rising sand
SAP As soon as possible
SAR Search and Rescue
SARPS Standards and Recommended Practices (ICAO)
Sat Saturday
SB Self-Briefing
SC Straticumulus
SCT Scattered
SE Southeast
SEC Seconds
SELCAL Selective Calling System ( A system which permits the selective calling of individual aircraft over radiotelephony channels linking a ground station with the aircraft)
SEP September
SEV Severe (used e.g. to qualify icing and turbulence reports)
SFC Surface
SG Snow grains
SH Showers
SHF Super high frequency (3000 –30000 MHz)
SHRA Moderate rain shower
SHRASN Moderate shower with rain and snow
SHSN Moderate snow shower
SID Standard instrument departure
SIF Selective identification feature
SIGMET Information concerning en-route weather phenomena which may affect the safety of aircraft operations
SIGWX Significant weather
SIMUL Simultaneous or simultaneously
SIWL Single isolated wheel load
SKC Sky clear
SKED Schedule or scheduled
SLAP Slot Allocation Procedure
SMC Surface movement control
SMR Surface movement radar
SN Snow
SNOWTAM A special series NOTAM notifying the presence or removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush and ice on the movement area, by means of specific format
SPECI Aviation selected special weather report (in aeronautical meteorological code)
SPL Supplementary flight plan message
SPOC SAR point of contact
SQ Squall
SQL Squall line
SR Sunrise
SRE Surveillance Radar
SRG Short range
SRR Search and rescue region
SS Sunset
SSE South-southeast
SSR Secondary surveillance radar
SST Supersonic transport
SSW South-southwest
ST Stratus
STA Straight in approach
STA Scheduled time of arrival (aircraft on blocks)
STAR Standard (instrument) arrival
STD Scheduled time of departure (aircraft off blocks)
STF Step down fix
STOL Short take-off and landing
STS Status
SUBJ Subject to
Sun Sunday
SUPPS Regional supplementary procedures
SVC Service message
SVCBL Serviceable
SW Southwest
SWC Significant weather chart
SWY Stopway
T
t Ton(s) (weight)
T Temperature
TA Transition altitude
TACAN UHF Tactical Air Navigation Aid
TAF Aerodrome forecast
TAR Terminal area surveillance radar
TAS True airspeed
TAX Tyxiing or taxi
TC Tropical cyclone
TCAS Traffic Alert and Collision Avoidance System
TCH Threshold crossing height
TCU Towering cumulus
TDZ Touchdown zone
TEL Telephone
TEMPO Temporary or temporarily
TFC Traffic
TGL Touch-and-go landing
THR Threshold
Thu Thursday
TIL Until
TKOF Take-off
TLOF Touchdown and lift-off area
TMA
