Before revision: 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.
After revision: A 'traffic alert and collision avoidance system (TCAS, pronounced ; TEE-kas) , is an aircraft collision avoidance system designed to reduce the incidence of mid-air collision (MAC) between aircraft.