We seem to have drifted off thread here, but my 2 cents worth, on the matter of circling approaches, in particular the Busan 767 accident.
It is a requirement of the circling approach, to keep the runway or lights associated with the approach, in sight at all times.
I am astounded at the number of pilots I have watched, trying to circle without looking outside until late on base leg.
Busan 18 is a tight approach (done it many times), and in bad weather can be a handful. However if the Chinese 767 crew had bugged out when they lost visual this would not have happened. They hit the hill from behind! Seen the scars.
Maui