Re: Ryanair
Joined: May 2000
Posts: 263
Likes: 0
From: Scotland
And most of an airport may be clear with excellent visibility, yet there may be shallow fog lying in a small layer around the transmissometers [visibility measuring equipment]. Although crews might see the runway from 20 miles or more, if the IRVR is giving values below the minima permitted for an approach to a runway, the aircraft cannot legally commence an approach. Seen it a few times and it's desperately frustrating!




