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The title says it all.

If TCAS II is installed and functioning, does it satisfy the ADS-B OUT mandates?

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  • $\begingroup$ They're not entirely separate. Some implementations of ADS-B use a 1090 MHz Mode S transponder, which is also a required component of a compliant TCAS II installation. The position source required for ADS-B is separate, however. I think it's a reasonable question. $\endgroup$ – pericynthion Dec 7 '17 at 5:06
  • $\begingroup$ No to ADS-B OUT. Mode S transponders broadcast on 1090 MHz and can be designed to support ADS-B OUT. TCAS II receives on 1090 MHz so in addition to the TCAS function TCAS is capable of supporting ADS-B IN. Most of these ADS-B IN capable TCAS just receive the ADS-B messages, package them into reports and forward them to a separate processor that contains the ADS-B IN applications. $\endgroup$ – Gerry Dec 8 '17 at 0:06
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TCAS II and ADS-B are two entirely different systems, with entirely different functions, and they have different regulations. Having TCAS II installed & functioning does not satisfy any of the ADS-B OUT mandates.

ADS-B regulations European Union

For Europe, the regulations for ADS-B are published in the surveillance performance and interoperability requirements Implementing Rule (SPI-IR), Commission Implementing Regulation (EU) No 1207/2011, amended by Commission Implementing Regulation (EU) No 1028/2014 and Commission Implementing Regulation (EU) 2017/386.

TCAS regulations European Union

TCAS II, version 7.1 is regulated by Commission Regulation (EU) No 1332/2011 amended Commission Regulation (EU) 2016/918.

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