Originally Posted by OP
I do know the "Z" is always the preferred approach but my question to you all is….
In the absence of a designator such as Y or Z for an approach, are we to fly the "Z" procedure? And if so, would anyone have a reference for this somewhere?
Originally Posted by Counter Rotation
The OP has asked for an AIP reference for his question, and as far as I can see no one has found one (me included).
That's because there is no reference because the ILS Z is not the preferred procedure. If it was, it would be written somewhere.
As AC said, "they just say "Cleared ILS approach". They do this for a few reasons but the main one is that they just don't give a rats which one you fly."
Put it another way. On
any approach where there is currently a Y and Z option, and ATC hasn't nominated the Y or the Z, would in make any difference to what the aeroplane would do if you flew either? The answer is, of course, no.