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. In 1956, a United Airlines DC-7 and a TWA Constellation collided over the Grand Canyon, killing all on board. By the 1970s, attention turned to using the signals from transponders to create a collision avoidance system.
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