I have a GNS 430W feeding a pair of GRT Horizon EFIS's with a Digiflight IIVS auto pilot. I've been doing practice GPS approaches to my home airport of KALX for weeks and all systems have been working as expected. Today, however, I could not get a vertical guidance to work no matter what I tried. I was also getting the "FLG" which I think means "flagged" on the auto pilot vertical guidance. The "localizer" vertical line was showing up on the EFIS and working correctly throughout the approaches, but, I could not get any vertical guidance to work (the vertical guidance bar never showed up on the EFIS).
In summary, I could get the "localizer" bar to work and the autopilot to track the localizer, but, could not get the vertical guidance bar nor would the autopilot track the vertical guidance as it usually does.
I can't find any clues in the manuals.
KALX has an LP approach.
I'm 99% certain that all systems are working correctly...and that I'm not operating something correctly in the GARMIN 430 or the GRT EFIS.
Thanks,
Curt
In summary, I could get the "localizer" bar to work and the autopilot to track the localizer, but, could not get the vertical guidance bar nor would the autopilot track the vertical guidance as it usually does.
I can't find any clues in the manuals.
KALX has an LP approach.
I'm 99% certain that all systems are working correctly...and that I'm not operating something correctly in the GARMIN 430 or the GRT EFIS.
Thanks,
Curt