is TCAS required
Im flying an airliner and I have a question which I couldn't find an official answer for:
When I have a malfunctioning TCAS on board and I look it up on the MEL, it says that one of the conditions to dispatch a flight with an inoperative TCAS system is that:
"Enroute or approach procedures do not require its use."
And the question is: does enroute or approach procedures or regulations require its use or not?