What Is TCAS? A Comprehensive Guide to Traffic Collision Avoidance Systems
Pilot Institute
JULY 4, 2025
Key Takeaways TCAS involves aircraft transponders interrogating each other to predict a collision course. By the 1970s, attention turned to using the signals from transponders to create a collision avoidance system. Transponders were devices that had become common on many aircraft to make them appear on ATC radar.
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