What type of approach does SA signify in ATC terminology?

In air traffic control terminology, SA signifies a "Surveillance Approach." This type of approach is characterized by the use of radar or other surveillance means to provide guidance to aircraft as they descend and approach the runway for landing. During a surveillance approach, air traffic controllers utilize radar data to track the aircraft's position and provide instructions to pilots to ensure safe separation and efficient traffic flow.

The surveillance approach enhances situational awareness for both pilots and controllers, allowing for real-time adjustments to the aircraft's flight path based on current conditions. This method is particularly valuable in busy airports where precise navigation can help in maintaining orderly and safe operations in the airspace.

Understanding the importance of surveillance in air traffic management helps clarify how controllers use available technology to improve safety and efficiency.