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SIGMET (Significant Meteorological Information)
An in-flight weather advisory for significant hazards that may affect all aircraft, such as severe icing, severe or extreme turbulence, dust storms, or volcanic ash. SIGMETs are checked with convective SIGMETs and G-AIRMETs when building a route weather picture.
Related Terms
- Slip/SkidUncoordinated flight conditions. A slip occurs when the aircraft is banked too much for the rate of turn (ball deflected toward the turn). A skid occurs when there is too much rudder for the bank angle (ball deflected away from the turn). The inclinometer (ball) indicates coordination.
- Solo FlightA flight in which the student pilot is the sole occupant of the aircraft. Before the first solo, the student must receive endorsements from their flight instructor certifying competence in the specific aircraft type and at the specific airport.
- Special Use Airspace (SUA)Airspace of defined dimensions where activities must be confined or where limitations are imposed on aircraft not participating in those activities. Types include prohibited, restricted, warning, military operations (MOA), alert, and controlled firing areas; status is often verified via NOTAMs and charts.
- StallAn aerodynamic condition where the wing exceeds its critical angle of attack and can no longer produce sufficient lift to sustain flight. A stall can occur at any airspeed, in any attitude, and at any power setting — it is always caused by exceeding the critical angle of attack.