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== Security aspects ==
TCAS was not designed with security in mind, even in its newest versions. With the rise of software-defined radios, security researchers have investigated wireless attacks on TCAS. Researchers demonstrate<ref name="Usenix">{{Cite web|url=https://www.usenix.org/system/files/usenixsecurity24-longo.pdf|title=On a Collision Course: Unveiling Wireless Attacks to the Aircraft Traffic Collision Avoidance System (TCAS)|website=Usenix Security 2024}}</ref> how to take full control over the collision avoidance displays and create RAs of arbitrary aircraft on a collision course. These attacks can be launched using commercial off-the-shelf hardware and could be used to instruct the pilot to climb or descend at will. However, these attacks are only possible when the attacker is close to the victim aircraft (up to a distance of 4.2
== Relationship to Traffic Advisory System (TAS) ==
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