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Both cases have been addressed by Version 7.0 of TCAS II and are currently handled by a corrective RA together with a visual indication of a green arc in the IVSI display to indicate the safe range for the climb or descent rate. However, it has been found that in some cases these indications could lead to a dangerous situation for the involved aircraft. For example, if a TCAS event occurs when two aircraft are descending one over the other for landing, the aircraft at the lower altitude will first receive a ''"Descend, descend"'' RA, and when reaching an extreme low altitude, this will change to a ''"Level off, level off"'' RA, together with a green arc indication directing the pilot to level off the aircraft. This could place the aircraft dangerously into the path of the intruder above, who is descending to land. A change proposal has been issued to correct this problem.<ref name=CP116>[http://adsb.tc.faa.gov/TCAS/CPs/CP116.pdf Change proposal CP116] {{webarchive|url=https://web.archive.org/web/20110717003622/http://adsb.tc.faa.gov/TCAS/CPs/CP116.pdf |date=2011-07-17 }}</ref>{{update|date=April 2021}}
== 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 km), limiting the risk of abuse in the real world.
== Relationship to Traffic Advisory System (TAS) ==
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* [https://web.archive.org/web/20120226205014/http://www.oilandgasuk.co.uk/downloadabledocs/284/c_Mark_%20Prior.pdf Collision avoidance on the UKCS (TCAS II Trial) by Mark Prior (Bristow)]
* {{cite news |url= https://leehamnews.com/2018/07/13/bjorns-corner-largest-navigation-change-since-radar-part-5/ |title= Bjorn's Corner: Largest navigation change since radar, Part 5 |author= Bjorn Fehrm |date= July 13, 2018 |work= Leeham News}}
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