Or at the top of the glide slope? I’m assuming the outer circle is where you should intercept the localiser, and what, generally, should be your altitude AGL at this point? I keep messing up approaches as I’m either too high or too low.

I tend to aim for 10,000FT at 40NM and then 3,000FT at the 10 mike final/ILS path

As a general rule of thumb, I always intercept the localiser close to the beginning of the ILS triangle at an altitude of around 2500-3000ft above the airport’s altitude. :)

Where’s the ILS triangle?

Forget about the triangle or cone. What you want to know is the distance and glide slope angle/deg.

Learn to use your HUD. Learn the ins and outs of the ILS. Then learn how to judge the decent via distance & slope.

It’s the red triangle that leads from the edge of the runway to about 10NM out from the airport. :)

Just remember that for every nautical mile out from the runway, the glideslope is 300 feet AGL. So at 10 nautical miles out you intercept the glideslope at 10 x 300 = 3000 feet AGL; at 5 miles out the glideslope is 5 x 300 = 1500 feer AGL and so on.

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