What is ads C?

Automatic dependent surveillance - contract (ADS-C) uses the same systems on board the aircraft to automatically transmit similar information - aircraft position, altitude, speed, elements of navigational intent and meteorological data - only to one or more specific Air Traffic Services Unit (ATSU) or AOC [1] ...



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Below 10,000 feet MSL (mean sea level): A transponder is not required unless the aircraft is within 30 nautical miles of a Class B airport. At or above 10,000 feet MSL: A transponder with altitude reporting capability is required.

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You may fly without ADSB under the Class B or Class C shelf provided you remain outside of any Mode C veil. §91.225 tells you where you cannot fly. It says you cannot fly within the lateral boundaries of the Class B or C airspace or above the airspace.

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