Peter wrote:
The GFC500 has just got an SB disabling the eletric trim.How did they implement that??
The fix is a firmware update, apparently.
The issue was reported late 2022 …. this is just the resolution:
Original report
GFC500 autopilot trim issue
I sense a bit of an obsession about trim runaways …c’om guys, those have been with us since ever and airplanes were not just falling out of the sky because of trim runaways (not that they did not happen) . My 40YO autopilot has at least three straightforward ways to stop the trim from running away from you, plus a couple more not so straighforward…
Just what you want in IMC.
And you get B737 Max 
auto-pilot commanded runaway trim
Just what you want in IMC.
There was a one-off problem involving auto-pilot commanded runaway trim. Evidently this revealed a bug in the software which could make it happen again.
The fixed software is now available.
I know this because a friend of mine got one installed about a week before the SB came out! But he now has a functioning AP again.
It is from the US Socata owner group. No more detail was provided other than this was a new installation and the trim was disabled apparently “out of the box”.
The GFC500 has just got an SB disabling the eletric trim.
Why? Can you share the source?
The GFC500 has just got an SB disabling the eletric trim.
How did they implement that??
The fix is a firmware update, apparently.
Peter wrote:
I don’t know which one is used for the GS. Maybe @wigglyamp knows; not sure he is still around.
173 Localizer Deviation
174 Glideslope Deviation
Airborne_Again wrote:
What do you mean with only output GPS steering commands? Do you mean over ARINC? The GTN can certainly output analogue localiser and glideslope deviations.
Interesting. I’ll have to dig a bit deeper in the setup of my panel, because in my case it doesn’t, or at least if it is output, it isn’t picked up.
