Don't know why, but my units got different rules.
If you're landing after another landing a/c, the latest landing clearance is 1nm.
If you're landing following a departure, you have to have a landing clearance AT 2nm, not inside. For this to work, the departure (normally jet a/c) has to be rolling by the time the inbounds at 4nm.
I don't know why the difference in rules, (greater interference as the departure breaks the beam?) but LL & KK use these 1nm and 2nm rules!
