the 230 air traffic facilities across the country, 100
are currently using this system to separate traffic. It
is expected to be connected and operating at all 230
facilities by 2019. All aircraft operating in controlled
airspace must be equipped with ADS-B Out avionics that
broadcast the plane’s location, by Jan. 1, 2020.
With the upgraded surveillance and broadcast system and
aircraft equipped with ADS-B Out transponders, aircraft
positions on controller screens update almost
continuously, compared to every 4.7 seconds or longer
ADS-B also enables more accurate tracking of airplanes
and airport vehicles on runways and taxiways, increasing
safety and efficiency. The new system significantly
improves surveillance capability in areas with
geographic challenges like mountains or over water.
Airplanes equipped with ADS-B In, which is not currently
mandated, will give pilots information through cockpit
displays about location in relation to other aircraft,
bad weather and terrain, and temporary flight
In addition to the operational benefits of ADS-B,
each one of the 634 ground stations installed by
Exelis of McLean, Va., is substantially smaller than
a radar installation – resulting in less impact to
the environment and less cost to maintain.