Glamdring, that's the sensitive area, the ILS critical area is important for all ILS ops.
Cauatc, we have one runway the same as yours, as aircraft line up from the full length, they pass through the glide path critical area. In the past, we would simply warn the aircraft on approach that they may experience fluctuations on the GP, but now we simply do not use that line up route when any aircraft is within 15nm on an ILS approach (protected range on the GP).
Of course, the localiser critical area is harder to protect, and so if an aircraft rolls right to the end of one of our runways, we simply warn all following aircraft of fluctuations on the localiser. The A380 has a larger localiser critical area due to its size, and will infringe its critical area if it rolls to the end on any of our runways.
Last edited by Gonzo; 20th Nov 2009 at 09:03.