If you’ve flown into Aspen-Pitkin County Airport (KASE), you’ll notice that you are able to tune into the LOC frequency for runway 15.
The localizer (LOC) provides lateral course guidance, side to side, during an approach to landing. What it does not provide is vertical guidance, up and down. This is different compared to an ILS approach which will provide both lateral and vertical guidance. KASE does not have an ILS approach procedure.
You may have also noticed, if you’ve flown an approach into KASE in Infinite Flight, that the LOC frequency has a glide-slope. The approach also isn’t nearly as steep as shown on the approach plates for runway 15, each showing that the glide slope should be 6.59 degrees. This is different compared to the standard 3.00 degrees that is normally used at most other airports. It’s one of the steepest approaches in the world. Here is why that is, from a developer.
”KASE has LOC/DME, but no glideslope/full ILS, so from what I understand pilots need to make this 6? approach based on sight and no instrumentation other than localiser info (and likely some dead reckoning calculations).
Since Infinite Flight sees the LOC, it must treat it as an ILS, but since it doesn’t have an assigned glideslope, it just defaults it to the standard 3? approach.”
I found this interesting. You wouldn’t know this without looking at the approach plates beforehand, which could be misleading if you didn’t know this information.
The most fun you can have is to learn how to understand the approach plates so you can fly these types of approaches properly. Do your research before setting up a flight and reap the rewards on arrival. It’s a very satisfying approach to pull off.
References: CFI Notebook