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Automatic Dependent Surveillance-Broadcast (ADS-B) is a surveillance system, very similar to radar, which increases capacity and makes the NAS more efficient and safer.

Aircraft most be equipped with ADS-B Out when operating in most U.S. airspace.

With integration of ADS-B, this allows more surveillance coverage for air traffic control (ATC) in remote areas where no radar coverage existed.

The ADS-B system works along with the aircraft avionics to determine the aircrafts position via three-dimensional position from GPS, along with other information and the aircrafts velocity (speed).

In the U.S. aircraft that are equipped with ADS-B can send information over two frequencies, which are: 978 or 1090 MHz (megahertz). If the ADS-B is operating on 978 MHz this is known as the Universal Access Transceiver (UAT). If using the 1090 MHz frequency it is associated with either a Mode A, C and S transponders. Both must be operated in the transit mode at all times.

So, what is ADS-B Out?

ADS-B Out sends information out about an aircraft's GPS location, altitude, and ground speed along with other data to ATC. If your ADS-B Out fails inflight, you can continue the flight to your destination.

What airspace is ADS-B Out required?

ADS-B is required in most controlled airspace. Basically, any airspace that requires a transponder also requires ADS-B system.

  • Class A

  • Class B

  • Class C

  • Class E

To include, within the Mode C Veil from the surface up to 10,000 feet MSL.


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