Raycast to Terrain (Conditional Statements)

I have been trying to get my helicopter's raycast line to collide with the terrain so that when the line collides with the terrain, something happens. For now I just put print for testing/debugging purposes.

I do not have a lot of experience with this Ray-casting business. What am I doing wrong?

Here is my code:

 #pragma strict
 
 public var Player : GameObject;
 public var Follow : GameObject;
 public var terrain : Terrain;    
 
  
 
     function Update () {
     
     var hit : RaycastHit;
       Debug.DrawRay(transform.position, transform.up * 3, Color.red);
       
       
     if(Physics.Raycast(transform.position, transform.up, hit, 3)) {
     if(hit.collider.gameObject == terrain){  
     
     print("You hit the Terrain.");
     
     }
     }
     }