Acronyms
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S
| Acronym | Meaning | Source |
| S | South, South Latitude | AIS |
| S-I | Straight-In | AIP |
| S/B | Service Bulletin | WATOG |
| S/E | Single-engine | |
| SA | Sand | AIS |
| SA | Selective Availability | |
| SA | Situation Awareness | |
| SAAA | Sport Aircraft Association of Australia | |
| SAG | ||
| SAL | Supplementary Airline Licence | AIS |
| SALR | Saturated Adiabatic Lapse Rate | |
| SALS | Simple Approach Lighting System | AIS |
| SAR | Search and Rescue | AIS |
| SARPs | Standards and Recommended Practices (ICAO) | ICAO |
| SARTIME | Time search action required | AIS |
| SARWATCH | Search and Rescue Watch | |
| SAT | Saturday | AIS |
| SATCOM | Satellite Communication | AIS |
| SB | Southbound | AIS |
| SBAS | Satellite Based Augmentation System | |
| SC | Safety Case | |
| SC | Stratocumulus | AIS |
| SCC | Standards Consultative Council | CASA |
| SCP | Safety Critical Personnel | |
| SCT | Scattered (meteorological) | AIS |
| SDBY | Standby | AIS |
| SDC | Standard Departure Clearance | AIS |
| SDR | Service difficulty report | CAR 1998 |
| SE | South East | AIS |
| SEA | Sea (used in connection with sea-surface temperature and state of the sea) | AIS |
| SEACO | Single engine aircraft only | |
| SEC | Seconds | AIS |
| SECN | Section | AIS |
| SECT | Sector | AIS |
| SELCAL | Selective Calling System | AIS |
| SEP | September | AIS |
| SER | Service, Servicing, Served | AIS |
| SEV | Severe (used eg to qualify icing and turbulence report) | AIS |
| SFC | Surface | AIS |
| SFL | Sequenced Flashing Lights | AIS |
| SG | Snow Grains | AIS |
| SH... | Showers (followed by RA=rain, SN=snow, PL=ice pellets, GR=hail, GS=small hail and/or snow pellets or combinations thereof, eg, SHRASN = showers of rain and snow) | AIS |
| SHF | Super High Frequency (3,000 to 30,000 MHZ) | AIS |
| SHP | Shaft Horse Power | |
| SID | Standard instrument departure | ICAO/AIP |
| SIF | Selective Identification | AIS |
| SIG | Significant | AIS |
| SIGMET | Information concerning en route weather phenomena which may affect the safety of aircraft operations | AIS |
| SIL | Service Information Letter | |
| SIMUL | Simultaneous, or Simultaneously | AIS |
| SKC | Sky Clear | AIS |
| SKED | Schedule, Scheduled | AIS |
| SL | Service Letter | |
| SLP | Speed Limiting Point | AIS |
| SLW | Slow, Slowly | AIS |
| SM | Safety Manager | |
| SMC | Surface Movement Control | AIS |
| SMR | Surface Movement Radar | AIS |
| SMS | Safety management system | CAR 1998 |
| SN | Snow | AIS |
| 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 | AIS |
| SOC | Start of Climb | AIS |
| SOE | Schedule of experience | CAR 1988 |
| SOM (SoM) | System of Maintenance | CAR 1998 |
| SOPS | Standard Operating Procedures | |
| SOR | Summary of responses (to DP or NPRM) | CASA |
| SOT | Start of TORA (take-off) | AIS |
| SP | Single Pilot | AIS |
| SPA | Sport Aviation | AIS |
| SPECI | Aviation Special Weather (in aeronautical meteorological code) | AIS |
| SPFIB | Specific Preflight Information Bulletin | AIS |
| SPOT | Spotwind | AIS |
| SPS | Standard Positioning Service | |
| SQ | Squall | AIS |
| SR | Sunrise | AIS |
| SRB | Safety Review Board | |
| SRD | Standard Radar Departure | AIS |
| SRG | Short Range | AIS |
| SRM | Structural Repair Manual | WATOG |
| SRR | Search and Rescue Region | AIS |
| SRY | Secondary | AIS |
| SS | Sandstorm | AIS |
| SS | Sunset | AIS |
| SSA | System Safety Approach | |
| SSB | Single Sideband | AIS |
| SSCRO | Senate Standing Committee on Regulations and Ordinances | |
| SSE | South South-East | AIS |
| SSI | Structural Significant Item | WATOG |
| SSM | System Schematics Manual | WATOG |
| SSR | Secondary Surveillance Radar | AIS |
| SST | Supersonic Transport | AIS |
| SSW | South South-West | AIS |
| ST | Stratus | AIS |
| STA | Straight in Approach | AIS |
| STAR | Standard Arrival Route | AIP |
| STAR | Standard instrumental arrival | ICAO |
| STARs | Standard terminal arrival routes | |
| STC | Supplemental Type Certificate | CASR Part 21 |
| STD | Synthetic training device | CASR Part 60 |
| STD | Standard | AIS |
| STF | Stratiform | AIS |
| STN | Station | AIS |
| STNR | Stationary | AIS |
| STODA | Supplementary Take-off Distance | AIS |
| STOL | Short Take-off and Landing | AIS |
| STS | Status | AIS |
| STWL | Stopway Light(s) | AIS |
| SUBJ | Subject to | AIS |
| SUN | Sunday | AIS |
| SUP | Supplement (AIP Supplement) | AIS |
| SUPPS | Regional Supplementary Procedures | AIS |
| SVCBL | Serviceable | AIS |
| SVY | Survey Operations | AIS |
| SW | South-West | AIS |
| SWIM | System-Wide Information Management | |
| SWOT | Strengths, Weaknesses, Opportunities & Threats | |
| SWS | Soft Wet Surface | AIS |
| SWY | Stopway | AIS |