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Okay, I posted it over in the Technical Corner forum, here: https://www.pilotsofamerica.com/community/threads/displaying-approach-waypoints-in-3d-google-earth.138267/

As part of a discussion of an accident (see here https://www.pilotsofamerica.com/community/threads/cessna-208b-crash-short-of-burley-municipal-airport.137623/page-3), I created a KML file for Google Earth (GE) which depicts the waypoints on an instrument approach in 3D to better visualize what...

...uhhhh....maybe not. I would be happy however, to post a separate thread explaining how to create the KML file to display the image. Any suggestions as to which forum it belongs in?

Okay, I'm just having some fun with Google Earth here. This is a more dramatic depiction of the advisory GP for the N23 RNAV-7 approach. Sorry, if this is beating a dead horse...but having learned how to make these depictions, I can't help myself :)

Found anonther approach with the same "feature" -- the RNAV-24 at Dixon, Wyoming. Following the advisory GP will either run you into the ground, or clear by maybe 20-40 feet if you're lucky. Here are a couple of Google Earth images. The first one shows an overall view from the FAF (HIBNU)...

To toss a bit more into the word salad, here's what the FAA's Instrument Flying Handbook (2012 Edition) has to say about VDA: The Vertical Descent Angle (VDA) found on nonprecision approach charts provides the pilot with information required to establish a stabilized approach descent from the...

I took them at their word that they were maintaining 5500 MSL in the video during the early part of the approach, and that they had the proper altimeter setting. No allowance for temperature, but being only 1500AGL or less, I didn't think temperature would make a huge difference. Since you...

Here: https://oeaaa.faa.gov/oeaaa/external/letterViewer.jsp?letterID=321199198

More proof of Gryder's lying. I found the ADS-B data for the demo flight in FlightAware, and plotted their approach versus the fixes. Turns out, they were about 200' high at JAMID and that would have put the VDI close to, or at the bottom of the screen. So, Gryder's assertion that the VDI took...

Most of their flight seems to have been at 5500 MSL, with terrain in that area around 4100-4200MSL. Check the sectional. I suspect they were mostly in airspace with Class E starting at 700AGL, perhaps a short time with Class E at 1200, and during the approach, surface Class E. That's 3sm vis...

Not perhaps in line with latest discussion here, but here's a refresh on some background. If you have time read the FAA's analysis of the stack which the a/c impacted at the link below. There are actually 7 stacks listed, but #1617 is the one in question here. The items I noticed are (a) The...

Okay, got it. I think I misinterpreted your earlier post. It's okay to follow the advisory GP, but you must also comply with indicated altitude constraints per the published approach. Just FYI, I flew a couple practice approaches recently, waiting to intercept the advisory GS after IF, then...

I'd like to get some clarification on John Collins post above (#31), and ask a question. He refers to the "indicated altitude" and the "advisory GP" altitude. I think by "indicated" he means "altimeter reading with proper baro setting for the airport", right? And by "advisory", he means a WAAS...

I also confirmed this with Garmin's GNX and GTN simulators. However, an earlier version of their simlator (which I lost access to when i upgraded last week), and I suspect, older nav units do follow different slopes for that approach. Someone with a G1000 simulator verified this and posted on...

I'll continue the conversation on that thread...

You are correct -- I was not careful with my wording. My comments apply to approaches with advisory vertical guidance, prior to FAF. Here's what I should have said: For approaches with step-down fixes that are +V (e.g. LNAV+V), the GNX and GTN units will project the VDA back all the way to the...

It appears these multi-angle approaches, although described as "rare cases" in the FAA AC120-108, are not super rare. I just had a look at the O60 RNAV 32 approach (Cloverdale, Calif), and it has a much larger slope change. The descent angle from IF to FAF is 0.84 degrees (133 fpm descent rate @...

Interesting. You can get the other behavior if you go to the flight plan and click on the altitude for IREME and HIKLO, then click "Remove Constraint". After this, the arrow on the vertical tracking scale changes to a diamond. I don't use one of those displays, so I have no idea what the arrow...

I just tried another experiment with the Garmin simulator for the GNX375. Turns out Garmin has extended the 3.75 degree slope all the way back to IREME -- at about 8600 or 8700 MSL. Arriving at IREME at about 8600, Garmin will start displaying a GS indication and the a/c will be on the slope at...

Well, at least part this thread is/was focused on showing that Gryder's analyis is not valid, so that's not really handwringing, per se. But yes -- once below MDA it's on the pilot to remain visual and avoid obstacles. I don't think anyone disagrees with that.