What is the primary purpose of the TCAS system for pilots?

The primary purpose of the Traffic Collision Avoidance System (TCAS) is to issue warnings for potential collisions. TCAS is an onboard system that monitors the airspace around an aircraft for other transponder-equipped aircraft. By utilizing data from these transponders, TCAS can determine the relative positions and altitudes of nearby aircraft. When it identifies a potential collision risk, it provides auditory and visual alerts to the pilots, advising them on necessary actions to avoid a collision. This capability makes TCAS a crucial safety system, enhancing situational awareness and helping to prevent mid-air collisions, which is a critical aspect of pilot responsibilities.

The other options, while related to aviation, do not align with the core function of TCAS. For instance, providing weather updates is typically the role of onboard weather radar and associated systems. Navigating through controlled airspace involves air traffic control communications and navigation systems, rather than TCAS itself. Assisting in fuel calculations pertains to performance planning and management, which is outside the scope of TCAS functions.