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Am I wired right?

T

tonyharr

I'm New Here
Hoping someone is able to set me straight on the following, as my noodling on the issue has not resulted in the desired outcome.

We upgraded the Garmin 530W to an Avidyne IFD540 a while back - great unit, love it.
But when it came to do an RNP/RNAV, it could not fly the procedure turn, nor descend on the glide path when connected to our Trio Pro Pilot autopilot.

The Trio went back for a firmware upgrade, and so should be fit for purpose now.

But still it cannot fly the approaches - can follow a flight plan, climb and descend - those work just fine.

So that let me to "data labels" in the IFD - they are now turned on. And GAMA (instead of ARINC 429) - so that is turned on. But still won't fly the approaches.

I note that on the Trio, the GPSS and GPSV lights do not come on. They light up on powering on the autopilot, so they "work", they just don't come on when trying to fly an approach.

So, do I have a wiring issue? Should there be something more wired from the Avidyne to the Trio?
Is this a setting - I see on the IFD that there is about five different GAMA settings that can be pushed out?
Should the data speed to high or low (or doesn't matter) - Trio says it does not.

This is all bundled into an RV10.
Any advice is gratefully received.
tony
 
Almost certain that the proper protocol is ARINC not GAMA.
EDIT: I'm a little rusty and a bit older since I cut my teeth on this stuff. That being said, seems I remember GAMA is the extended definition of the (labels) that sit on top of the ARINC-429 hardware interface/basic protocol.

There are a few different definitions/versions of the GAMA labels with minor differences between them.
 
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I assume everything worked before, with the 530W? The IFD is supposed to be a drop-in replacement, so the only thing missing are the internal settings. Do you still have the 530, or a screen shot of all the settings? The LPV approaches use ARINC, so that's where I'd look.
 
BobTurner said:
I assume everything worked before, with the 530W? The IFD is supposed to be a drop-in replacement, so the only thing missing are the internal settings. Do you still have the 530, or a screen shot of all the settings? The LPV approaches use ARINC, so that's where I'd look.
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Sorry Bob, should have mentioned that, no, never worked before. Trio needed an update to make it happen. I'll set to ARINC and give it a try - thanks
 
I suggest you download the install and operator manuals and methodically check the wiring and the settings.
 
You probably know this, but according to the Trio Pro Pilot manual, "The ARINC lateral and vertical guidance is only accepted from the GPS or EFIS when the autopilot is in TRK mode."

ARINC 429 data is ignored when the Trio is in CRS or INT modes.

A Garmin GNS 530W ARINC 429 output is set to "GAMA 429" and "LOW" speed when connected to a Garmin autopilot. Pretty sure that these settings also work for the Trio. The Avidyne should be 530W compatible and use similar settings. I had a Trio Pro Pilot in my plane many years ago.

Steve
 
Turns out my original hunch was correct - the avionics shop has taken a look, and the wiring at the Trio Pro Pilot side was not correct. They are resolving that today and I should then have the functionality I crave
 
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