Box Collider on a Model Aeroplane not working.

I have an Aeroplane model to which i’ve attached a box collider and the terrain i created with unity’s terrain tools has a terrain collider.
But my plane just flies through the terrain i’ve tried the usual things like un-checking onTrigger and re making the terrain…but the plane still just passes through it. Any ideas on what i could be doing wrong?

A collider alone does not manage collision detection. They are designed to work alongside a rigidbody component for managing physics- if you don’t have a rigidbody, physics won’t work unless you write your own algorithms.