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## b. Requirements. 

1. In order to use TIS, the client and any intruder aircraft must be equipped with the appropriate cockpit equipment and fly within the radar coverage of a Mode S radar capable of providing TIS. 

<img src='content_image/543037.jpg'>

Typically, this will be within 55 NM of the sites depicted in FIG 4 − 5 − 5, Terminal Mode S Radar Sites. ATC communication is not a requirement to receive TIS, although it may be required by the particular airspace or flight operations in which TIS is being used. 

<img src='content_image/543039.jpg'>

