Question: Why do airplanes equipped with ADS-B in systems often find that weather data is not available until after the airplane is airborne? Because the weather

 Why do airplanes equipped with ADS-B "in" systems often find that

Why do airplanes equipped with ADS-B "in" systems often find that weather data is not available until after the airplane is airborne? Because the weather data is broadcast as part of FIS-B information which can only be received from UAT towers on 978 Mhz....you have to get airborne to achieve line of sight reception from the UATs. "In" equipped airplanes will always receive traffic and weather data regardless of position. Because the weather data is broadcast as part of FIS-B information which can only be received from UAT towers on 1090Mhz. you have to get airborne to achieve line of sight reception from the UATs. Weather data is not available for ADS-B systems

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