Traffic collision avoidance system
AIRCRAFT COLLISION AVOIDANCE SYSTEM WHICH ACTIVELY INTERROGATES OTHER AIRCRAFT TRANSPONDERS
TCAS; TCAS Alarm; Traffic Collision Avoidance Device; Traffic Collision Avoidance System; Traffic alert and collision avoidance system
A traffic collision avoidance system (TCAS, pronounced ; TEE-kas), also known as a traffic alert and collision avoidance system, is an aircraft collision avoidance system designed to reduce the incidence of mid-air collision (MAC) between aircraft. It monitors the airspace around an aircraft for other aircraft equipped with a corresponding active transponder, independent of air traffic control, and warns pilots of the presence of other transponder-equipped aircraft which may present a threat of MAC.