Which of the following best describes the two types of TCAS?

TCAS, or Traffic Collision Avoidance System, is critical for maintaining safe distances between aircraft in flight. The distinction between TCAS I and TCAS II is important because they perform different functions that enhance air safety.

TCAS I provides basic advisories to pilots regarding nearby aircraft, alerting them when another plane is within a proximity that could pose a collision risk. However, it does not provide resolution advisories, meaning it doesn't direct pilots on how to avoid a potential conflict.

On the other hand, TCAS II offers a more advanced level of functionality. It not only alerts pilots to nearby aircraft but also provides resolution advisories, which are specific vertical maneuvers to follow to ensure safe separation from conflicting traffic. This capability significantly enhances situational awareness and contributes to accident prevention.

Understanding these differences is crucial for pilots and aviation professionals, as knowing which TCAS version is in operation on their aircraft informs them of the system's capabilities and limitations in maintaining safety in the airspace.