FLIGHT INFORMATION PUBLICATION GENERAL PLANNING(74)

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SHORT TAKEOFF AND LANDING AIRCRAFT/STOL AIRCRAFT -An aircraft which, at some weight within its approved operating weight, is capable of operating from a STOL runway in compliance with the applicable STOL characteristics, airworthiness, Operations, noise, and pollution standards. (See Vertical Take-Off and Landing Aircraft)
SIDESTEP MANEUVER - A visual maneuver accomplished by a pilot at the completion of an instrument approach to permit a straight-in landing on a parallel runway not more than 1200 feet to either side of the runway to which the instrument approach was conducted.
SIGMET/WS/SIGNIFICANT METEOROLOGICAL INFORMATION (P/CG) - A weather advisory issued concerning weather significant to the safety of all aircraft. SIGMET advisories cover severe and extreme turbulence, severe icing, and widespread dust or sandstorms that reduce visibility to less than 3 miles. (See Convective SIGMET, Center Weather Advisory, Severe Weather Forecast Alerts, and AIRMET).
SIGMET INFORMATION (ICAO) - Information issued by a Meteorological watch office concerning the occurrence of specified enroute weather phenomena which may affect the safety of aircraft operations.
SIGNIFICANT POINT (P/CG) - A point, whether a named intersection, a NAVAID, a fix derived from NAVAID(s), or geographical coordinate expressed in degrees of latitude and longitude, which is established for the purpose of providing separation, as a reporting point, or to delineate a route of flight.
SIMPLIFIED DIRECTIONAL FACILITY/SDF - A navigational aid used for nonprecision instrument approaches. The final approach course is similar to that of an Instrument Landing System localizer except that the SDF course may be offset from the runway, generally not more than 3 degrees, and the course may be wider than the localizer, resulting in a lower degree of accuracy.
SIMULATED FLAMEOUT/SFO - A practice approach by a jet

aircraft (normally military) at idle thrust to a runway. The approach may start at a relatively high altitude over a runway (high key) and may continue on a relatively high and wide downwind leg with a high rate of descent and a continuous turn to final. It terminates in a landing or low approach. The purpose of this approach is to simulate a flameout. (See Flameout)
SIMULTANEOUS ILS/MLS APPROACHES - An approach system permitting simultaneous Instrument Landing System/Microwave Landing System approaches to airports having parallel runways separated by at least 4,300 feet between centerlines. Integral parts of a total system are Instrument Landing System/Microwave Landing System, radar, communications, Air Traffic Control procedures, and appropriate airborne equipment. (See Parallel Runways)
SIMULTANEOUS OPERATIONS ON INTERSECTING RUNWAYS - Operations which include simultaneous take-off and landings/simultaneous landings when a landing aircraft is able and is instructed by the controller to hold short of the intersecting runway or designated hold short point. Pilots are expected to promptly inform the controller if the hold short clearance cannot be accepted.
SINGLE DIRECTION ROUTES - Preferred IFR routes which are sometimes depicted on high altitude enroute charts and which are normally flown in one direction only. (See Preferred IFR Route)
SINGLE FREQUENCY APPROACH/SFA - A service provided under a Letter of Agreement to military single-piloted turbojet aircraft which permits use of a single Ultra High Frequency during approach for landing. Pilots will not normally be required to change frequency from the beginning of the approach to touchdown except that pilots conducting an enroute descent are required to change frequency when control is transferred from the Air Route Traffic Center to the terminal facility. The abbreviation "SFA" in the DoD FLIP IFR Supplement under "Communications" indicates this service is available at an aerodrome.
SINGLE-PILOTED AIRCRAFT - A military turbojet aircraft possessing one set of flight controls, tandem cockpits or two sets of flight controls but operated by one pilot is considered single-piloted by Air Traffic Control when determining the appropriate Air Traffic Service to be applied. (See Single Frequency Approach)
　
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