Originally Posted by
8314
PANS OPS 8168 gives you 25 miles of usable LOC, so this is obstacle checked, so you are good to go. If shorter it should say on your IAC.
Yes it does and you are correct, but we're not talking about the LOC, ICAO Annex 10 gives you a range of 10nm for a standard GS unless a different range is published in the individual airfield AIP and since the subject of the discussion is the vertical bit, it is worth noting that it is different to the LOC which covers the horizontal bit.
I would add that the minimum altitudes for the approach are published precisely because the GS cannot be relied upon outside it's DOC.