I’m not sure on this. Technically, it goes to Flg every time before it goes to Arm. It just changes so fast that you only see a flicker of Flg before it goes to Arm. Once it sees itself above the glideslope, Flg stays on. You may need to toggle mode twice to retry the Arm once below the glideslope.
It is possible to put a switch to disable altitude, but it’s not approved by the STC. You would have to adjust the altitude to altitude preselect and select a vertical speed.
For IFR flight, an IFR GPS only is adequate. For IFR training (at least a few hours) and the check ride, you will need to fly a VOR and ILS approach. There is some talk of removing the radio nav requirement, but it isn’t gone yet. For budget, you could just install the GPS and borrow/rent a...
The Sun-N-Fun fly-in is next week, Tuesday through Sunday. I will be spending most of the week at the Dynon Avionics booth in southwest corner of Hangar B. Please feel free to stop by for a demo of the Dynon equipment and a quote on a panel upgrade.
I have done many Dynon installs in PA-28’s. Have you priced out a Dynon system? The Dynon isn’t quite a big in panel space requirement as the G3X, but the G3X should fit.
The reason to put in a 430 would be that it can be had inexpensively. If it breaks, it can usually be replaced inexpensively. If you want to upgrade, you could just slide in an Avidyne down the road, so the installation cost would not be wasted. You would certainly want to do a WAAS version. If...
I have a couple of radios just removed for an upgrade, both have trays, backplates and connectors:
GTX330ES - $1,300 shipped Conus
GNC255A - $4,000 shipped Conus
I just removed a GPS175 from my 172 to install an Avidyne. The GPS175 was installed in September and used no more than 20 hours since installed. Includes ARINC harness for G5's or Dynon Skyview and Ethernet pigtail. Will include new Rami antenna. $4,500 shipped CONUS.