1 minute ago, Bert Pieke said:

I have not flown it... but the approach plate shows a glidepath intercept at 3800 feet.

I'll try it and see what I find.

Well with F1 it would intercept at WISIR 6000 I’ve never intercepted at 3800 at ZEDAB 

Ok… I think I know what’s going on or I suspect but won’t know until I’m in front of my computer again. So with F1 the glideslope would kick in prematurely it seems well before the FAF. So this whole time I have been flying that way because I didn’t know any different but in real life the glideslope doesn’t come alive until the FAF. So my Learjet would not capture the glideslope because I would be well above it thinking that the RXP GTN works like the F1 version. Imma test it out but I think that’s my issue…

27 minutes ago, Deltaair1212 said:

Well with F1 it would intercept at WISIR 6000 I’ve never intercepted at 3800 at ZEDAB 

OK, just flew it... this is an LP +V approach.

You are correct, WISIR at 6000 feet is the initial fix, but you are reponsible for the descent.

https://www.flyingmag.com/everything-you-need-to-know-about-rnav-gps-approaches/

You are given a vertical guidance profile, but you cannot couple this to the autopilot for a vertical descent.

What the F1 unit gave you was not correct (but certainly convenient..)

Try flying an RNAV LPV approach and you will see that the GTN/autopilot will fly it correctly.

My standard test approach is KTPA R01L LPV, via PIE.

Fly at 2600 feet and engage APR mode on the autopilot after overflying FITPA (after the teardrop turn).

The autopilot will intercept the glidepath.

42 minutes ago, Bert Pieke said:

Fly at 2600 feet and engage APR mode on the autopilot after overflying FITPA (after the teardrop turn).

The autopilot will intercept the glidepath.

Bert just so we’re all clear I’m in the FSW Lear 35A… my “approach mode” is just a simple GS button… this is all you are pressing correct? I forgot to ask if you even have the jet in your hangar 

11 hours ago, Deltaair1212 said:

Hello I looked for the log files but I did not find them per the instructions they are not in my documents.

As soon as a RXP component loads (the add-ons RXP menus, the RXP gauges), it creates its own log file with at least 1 line telling the version number of the component. This information is important because it tells both the component is loaded and whether it is compatible with the simulator version you're running. 

If you don't have any RXP log file, this alone tells there is a problem from the get go which might not even be related to the RXP GTN. Are you sure the panel.cfg for the FSW Lear is actually using only the RXP GTN gauge and not a mix with the older one you had?

Also, I've asked you to try out with a default aircraft in order to cross check whether you're experiencing a problem with the GTN itself, or the GTN in the FSW Lear. Did you try it out?

9 hours ago, Deltaair1212 said:

Bert just so we’re all clear I’m in the FSW Lear 35A… my “approach mode” is just a simple GS button… this is all you are pressing correct? I forgot to ask if you even have the jet in your hangar 

I no longer have the Lear installed, so will defer to Al for aircraft specific interaction.

I am simply commenting on the fact that F1 uses the GTN VNAV information to activate the glideslope indicator (which you can turn off in the ini file BTW.. I always did..) whereas RXP has decided to implement the real world autopilot interaction, where only a Garmin autopilot reacts to the VNAV signal, with its VNV/VPTH functionality, and NOT via the "glideslope" signal.

If you also have MSFS installed, you can observe this on the G1000NXi gauges, which have VPTH implemented.

4 hours ago, Bert Pieke said:

I no longer have the Lear installed, so will defer to Al for aircraft specific interaction.

I am simply commenting on the fact that F1 uses the GTN VNAV information to activate the glideslope indicator (which you can turn off in the ini file BTW.. I always did..) whereas RXP has decided to implement the real world autopilot interaction, where only a Garmin autopilot reacts to the VNAV signal, with its VNV/VPTH functionality, and NOT via the "glideslope" signal.

If you also have MSFS installed, you can observe this on the G1000NXi gauges, which have VPTH implemented.

In the interest of closure, Deltaair1212 now reports he has things working with the RXP GTN750. He just needed to make sure he intercepted the glide path from below and had the Lear AP Glide Slope function armed at least a few miles before intercept. Apparently the VNAV function with the F1 GTN750 led to some approach techniques that do not work with the RXP GTN 750.

Al

Edited December 30, 20214 yr by RXP