時(shí)間：2011-08-13 13:07來(lái)源：藍(lán)天飛行翻譯 作者：航空 點(diǎn)擊：次
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SEVERE WEATHER FORECAST ALERTS/SWFA - Preliminary messages issued in order to alert users that a severe Weather Watch bulletin (WW) is being issued. These messages define areas of possible severe thunderstorms or tornado activity. The messages are unscheduled and issued as required by the National Severe Storm Forecast Center at Kansas City, Missouri. (See SIGMET, Convective SIGMET, CWA, and AIRMET) SHORT RANGE CLEARANCE - A clearance issued to a departing IFR flight which authorizes IFR flight to a specific fix short of the destination while Air Traffic Control facilities are coordinating and obtaining the complete clearance. 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) |
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