Which is the primary service subsystem within the Standard Terminal Automation Replacement System (STARS)?

The primary service subsystem within the Standard Terminal Automation Replacement System (STARS) is the Terminal Automation Subsystem (TAS). This subsystem is crucial as it is responsible for providing various automated functions that support air traffic control operations. The TAS enhances the efficiency and safety of terminal air traffic operations by integrating radar, flight data, and controller workstations, allowing controllers to better manage air traffic.

In contrast, the other subsystems serve different roles. The Site Support Subsystem (SSS) provides technical support and maintenance at individual sites but does not perform core traffic management functions. The Central Operational Site (COS) acts as a centralized resource but is not directly involved in the day-to-day automation of terminal operations. The Emergency Response Subsystem (ERS) is designed to handle emergency situations, rather than the regular functional operations of air traffic management.

Overall, the TAS is integral to the functioning of STARS, making it essential for efficient and safe terminal area operations.