I fly exclusively in a consumer flight simulator, so excuse me if there's an obvious answer to this.
ILS approach plates typically show a long, arrow-like symbol to indicate the part of an approach path where the localizer and glideslope signals can be captured by an approaching aircraft; most often, when there are no natural or manmade obstacles, for 3º glideslopes, this is about 9nm out from the threshold and 3000ft above the touchdown zone.
Looking at a chart for ZBAA's ILS 36R approach (which I'm not sure I can include in this post since this would likely violate Navigraph and/or Jeppesen's ToS), 36R specifically has this arrow extend out twice as far as either 01 or 36L — to about 25.5nm and 6890ft above the deck.
Why is this, and how common are such extended ILS approaches elsewhere in the world?
