At Manchester J1 and JA, A1 and AG are considered by SRG to be the same departure point.
To quote:
"SRG have approved the following reduction in vortex wake separation; a minimum spacing of 2 minutes may be applied between successive departing aircraft where the leading aircraft is of Heavy category making a full length take off and the following aircraft is either Medium or Small category departing from Link JA for Runway 24R or Link AG for Runway 06L."
So we can use a reduced 2 minutes for your ATP from JA or AG behind a Heavy but you are entitled to 3 minutes if you want it. There is a warning over the page in the MATS 2 telling us to ask before we line you up and make sure you will take 2 minutes.
This dispensation does NOT extend to Medium types from the full length and Light types from the intersection. Nor does it include H and G or AF and B.
You can gather from all this, hopefully, that if we offer JA or AG we probably will expect 2 minutes behind a Heavy but I would always ask before committing to it.
This causes a problem also with the 757. We consider it to be a Medium for departing (Upper Mediuim for arriving). Some operators conider it a Heavy. We then have either a 1 or 2 minute separation from the same departure point dependent on how YOU categorise it. If you're taxiing out behind a 757 and you need 2 minutes, please tell us as soon as possible. You may even find yourself offered an intersection and depart before it! Oh and tell us if you are able an intersection too, that helps.
SRG haven't yet finalised what will be considered the same departure points on 24L.
Hope this helps.
(typos)
[This message has been edited by cossack (edited 18 December 2000).]