Thanks all, I'm aware that EVS, and LTS CAT I etc etc can mean CAT I approaches can be conducted in less than 600m RVR, and all the intricacies regarding failures of lighting etc, but I am trying to find out the reason why the figure of 600m was chosen.
There is a move within ICAO to harmonise 'LVP' provisions across the US and Europe, and across the world (There are 65 CAT III capable airports in Europe, 64 in the USA, and only 15 in the rest of the world - that surprised me when I found that out!), and as part of the discussion yesterday we were trying to find out why the figure of 600m was chosen, and is it relevant/suitable today?
All very interesting.
Last edited by Gonzo; 5th Dec 2013 at 09:50.