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Why does a TCAS II system usually require an STC for installation?

April 26, 2017ii installation require STC system tcas usually

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Why does a TCAS II system usually require an STC for installation?

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By definition, an STC or Supplemental Type Certificate defines how a product affects an existing type design. Certain additions or alterations to an aircraft’s certified layout or configuration requires STC approval. Because of the complexity and intricacy of a TCAS II installation, an STC is required to ensure the TCAS system is interfaced and performs properly with other aircraft systems. For example, please view this system component diagram for the Honeywell CAS67A TCAS II system. In this diagram, the amount of units related to a TCAS II installation and the interfacing involved with other systems can be seen. Since systems and configurations vary from aircraft to aircraft, the generic TCAS II installation manual may not be sufficient to properly install and certify the installation.