Air Traffic Control Entities
Terminal Radar Service Area also called (TRSA) were
established originally as part of the Terminal Radar Program. TRSA is an
airspace where ATC and radar services become available to pilots flying under
visual flight rules or instrument flight rules to maintain aircraft separation.
It is also an area where pilots are given the choice to receive radar service
in a location which has not been qualified as a Class C or Class B airspace. While
participation in TRSA services is voluntary, VFR operators are recommended to
contact radar approach control and to make use of TRSA service.
Terminal Radar Approach Control or (TRACON) are FAA facilities that hold air traffic controllers who use radios and radar displays to safely guide approaching and departing aircraft within a 30- to 50-mile radius up to 10,000 feet (FAA). Aircraft landing within 5 miles of an airport and below 2,500 feet are handed over from TRACON controllers to the Tower controller. When an aircraft is leaving TRACON’s controlling range, TRACON controllers would hand over responsibility for the aircraft to FAA En Route Centers, who guides the aircraft at higher altitudes while it makes its way towards the next airport.
TRSA and TRACON are both Radar operated and utilized when
approaching an airport. The main differences between them is that TRSA’s
purpose is separation between VFR and IFR aircraft and TRACON’s purpose is to
guide approaching and departing aircraft. TRACON can also provide safety alerts
and weather reports. TRACON and TRSA are usually found around busier airports.
http://flythewing.com/308/Blog/Entries/2016/2/8_TRSA_Procedures.html
https://www.faa.gov/news/fact_sheets/news_story.cfm?contentkey=4009
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