GHA 15 Configuration on G3X

[Amadeus]

I just installed the GHA 15 unit. G3X recognized the new equipment and in configuration mode I went to LRU and Enabled. Also in configuration mode I found RadioAGL and set antenna height (21"), maximum displayed height (5,000') and audio alerts to "Enable all."

Are there any other required or optional settings in configuration that need addressed?

 

[Traash]

I just installed the GHA 15 unit. G3X recognized the new equipment and in configuration mode I went to LRU and Enabled. Also in configuration mode I found RadioAGL and set antenna height (21"), maximum displayed height (5,000') and audio alerts to "Enable all."

Are there any other required or optional settings in configuration that need addressed?

Your all set.
500' is all the higher it will display pure radio altitude on the PFD. If you want to see AGL at higher altitudes you'll need to configure one of the Data Bar Fields.

 

[Amadeus]

Just found one more. Had to go to Sound and enable RadioAGL alerts.

 

[craigrj]

Any suggestions for mounting a GHA-15 on a Lancair 360? The spot that's least sensitive to pitch and roll (belly in line with the mains) is much closer to the ground than Garmin's minimum of 20".

 

[Amadeus]

Any suggestions for mounting a GHA-15 on a Lancair 360?

Isn’t that a retractable? Is there space between the tire/wheel wells even if it were sitting higher?

What about a bit aft of the mains? As far as set up you could measure distance of the GHA15 unit from the ground while someone pushes down on the rear fuselage to mimic your roundout/flare. The flaw would be that once the nose wheel is on the ground it may announce “one” foot to go again.

 

[craigrj]

Retractable, but using the wheel well to get more distance to the ground would put the electronic portion of the GHA-15 inside the fuel tank and probably violate the 120-deg free-of-obstacles restriction. I hesitate to put it too far aft of the mains lest you get the height conflated with pitch.

Are there any Garmin tech reps monitoring who may know what the implications of mounting lower than 20"might be?

There is a lidar based unit that has some limitations (doesn't work over water, doesn't integrate nicely into the G3X), but is a bit cheaper and doesn't appear to require 20" above the ground: https://landingheight.com/.