Cloud cover on non-precision approaches
I'm trying to compile some figures on the likely regularity of an operation into an airport with non-precision approaches given the known met data.
I'd welcome anyone's views on what proportion of cloud cover (oktas) at or close to the MDH would give you a reasonable chance of acquiring visual reference and making a successful landing.
For example, if your MDH is 650ft, how would you rate your chances of landing off an approach if the lowest cloud is 3 oktas at 600? How about 4 oktas? or 5?
Logically you'd say 4 oktas would give you around a 50% chance of getting in, but it's obviously more complex than that due to slant ranges etc.
Any views welcome.
NS