Definition
Areas surrounding certain airports where radar-based air traffic services are provided to participating pilots, including sequencing of arriving aircraft and separation between IFR traffic and participating VFR traffic. TRSAs are depicted on VFR sectional charts with solid black lines and altitude information for each segment. Pilot participation is voluntary but encouraged. TRSAs are not classified as Class B, C, D, or E airspace; they overlay existing controlled airspace, and the airport at the center is typically Class D.
Plain English
An area around certain airports where radar controllers will, if you ask, help line you up with other arriving aircraft and keep traffic safely separated. Using the service is optional but recommended.
Context Anchor
Seen on aeronautical charts and in airport-area planning when approaching or departing certain airports with radar approach control service.
Derivation
“Terminal” comes from a word meaning an end point or boundary. In aviation, it often means the area around an airport where flights are arriving or departing. “Radar” originally meant “radio detection and ranging,” which points to how controllers see aircraft position and provide the service.
Why Pilots Care
Provides traffic advisories and sequencing that increase safety without the full entry requirements or communications load of Class C airspace.
Intuition Check
Do not think “terminal” means the passenger building. Here it means the airport-area airspace around certain airports. Also, do not assume “service area” means every VFR pilot must use it; VFR participation is generally voluntary, unless another airspace rule inside the area requires communication.
Example Sentence 1
Approaching the TRSA, the pilot contacted approach control and requested radar service for sequencing into the airport.
Example Sentence 2
Although TRSA participation remains voluntary, most VFR pilots use the service for traffic advisories near the airport.