Which display technology is typically used in TCAS incorporated into an Electronic Flight Instrument System (EFIS)?

The correct answer is liquid crystal displays (LCD). LCD technology is favored in modern cockpit displays, including the Traffic Collision Avoidance System (TCAS) of an Electronic Flight Instrument System (EFIS), due to its ability to provide clear and easily readable images in various lighting conditions. LCDs offer advantages such as lower power consumption, a lightweight profile, and the capability to display complex graphics and data clearly.

In the context of TCAS, which requires real-time information about nearby aircraft to help prevent collisions, the clarity and responsiveness of an LCD are essential. This technology allows pilots to quickly interpret critical information about surrounding air traffic, enhancing situational awareness while flying.

While other display technologies such as electromechanical displays, analog gauges, and thermal printouts have their uses, they do not provide the same level of clarity, integration, and functionality that LCDs do in a modern cockpit environment. Electromechanical displays and analog gauges are more traditional and less common in current aviation applications, while thermal printouts are not practical for the continuous real-time display required in a TCAS context.