The TGU R02 approach had to be done accurately or you would hit that hill with an early descent. The DME for the approach when I was flying there in a 757 was deemed unreliable to the south so we used an NDB bearing to start the final step down. I always verified the accuracy of my on board crossing the VOR outbound navigation to back up the NDB bearing knowing what an early descent would cause. We couldn't land straight in but had to circle to land. The minimums were a lower MDA that direction so if we missed the approach from the north we could go lower approaching from the south. TGU is an airport that doesn't give you a whole lot of room for error. I loved it. Landed there hundreds of times.