To land straight in on 20 it was necessary to descend as soon and as rapidly as conditions allowed. At 15 DME descend to 7,000 ft and call the airport in sight or before 15 DME if able to get visual contact. Then get established so at 3miles, about 8 DME you are at 4300 ft. Sometimes S turning to a right base entry helped if you were a bit high. Otherwise you had to overfly the airport and make right traffic to 20 which was difficult from the left seat if you weren't familiar with the valley. 20 is an upslope runway so it is easy to get low if you just judge your descent by runway appearance alone. On really hot days you were weight restricted landing on 20 because of go around climb gradient restrictions because of terrain. Landing on 20 is like landing at any other airport if you start your visual approach early. Check airmen didn't count landing on 20 as meeting the requirements of a TGU check out so either they had to land on 02 with a legal tailwind or do another qualification flight.