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SIGMET
An in-flight weather advisory that is considered significant to all aircraft. SIGMET criteria include severe icing, severe and extreme turbulence, duststorms, sandstorms, volcanic eruptions, and volcanic ash that lower visibility to less than 3 miles.
Weeping wing
Deicing systems pump fluid from a reservoir through a mesh screen embedded in the leading edges of the wings and tail. depend on airflow as well, and if the primary air intake ices, an alternate air door either opens automatically
Light
The rate of accumulation may create a problem if flight is prolonged in this environment (over one hour).
Trace
Ice becomes perceptible. Rate of accumulation is slightly greater than the rate of sublimation.
TRSA
Terminal Radar Service Areas areas where participating pilots can receive additional radar services. The purpose of the service is to provide separation between all IFR operations and participating VFR aircraft.
VFR
Visual Flight Rules we fly under Visual Flight Rules
ILS holding position sign
ATC may hold you at this sign when the instrument landing system is being used at the airport.
Autokinesis
At night, a stationary dim light against a dark background will appear to move if a pilot visually fixates on the light for about six to 12 seconds.
Propeller Anti-icers:
Ice often forms on the propeller before it is visible on the wing. Props are treated with deicing fluid applied by slinger rings on the prop hub or with electrically heated elements on the leading edges.
Tail Stall
The horizontal stabilizer balances the tendency of the nose to pitch down by generating downward lift on the tail of the aircraft. When the tail stalls, this downward force is lessened or removed, and the nose of the airplane can severely pitch down.
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