Landing distance available
Nice read.. But the question remains unanswered.
The question is not about a displaced threshold. It's about using the Landing Distance beyond threshold or the Landing Distance beyond Glideslope.
In my opinion, the landing distance beyond Glideslope is probably depicted for earlier or some country specific aircraft where the AFM or equivalent document have published figures for the ground run required from touch down to stop.
In case of Class A performance aircraft, the Landing Distance Required can only be compared to the Landing Distance Available. It is not dependent on the type of Approach.
The distance beyond Glideslope to me in a B777 seems to be of little use as there is no comparison from any manufacturer published value either in the AFM or Simplified Performance Charts.
Request any opinions on this view pls!