New Trio A/P install PA28 Issues

[Jayp]

I've flown the Trio over 25 hrs now, have a good understanding of its operation. It took a while, maybe just me, but I’m frustrated with the performance. I’ve gotten input from Trio as to gain setting and have experimented with many different setting. no matter the gain settings, in CRS (heading) mode the a/p continually wanders back and forth up to 10 degrees in both directions. Unacceptable.
TRK (GPS course) wanders as well. Unpredictable as to where it goes when engaged. I’ve been left of course, engage and it goes to the left initially then wanders. I’ve engaged TRK mode immediately after entering a direct to waypoint knowing I’m centered on course with same results. Unacceptabl.
Anyone experienced same issues or might offer some direction? Frustrated in Texas

 

[GKC Aviation]

@jakej will be the man

 

[jakej]

I've flown the Trio over 25 hrs now, have a good understanding of its operation. It took a while, maybe just me, but I’m frustrated with the performance. I’ve gotten input from Trio as to gain setting and have experimented with many different setting. no matter the gain settings, in CRS (heading) mode the a/p continually wanders back and forth up to 10 degrees in both directions. Unacceptable.
TRK (GPS course) wanders as well. Unpredictable as to where it goes when engaged. I’ve been left of course, engage and it goes to the left initially then wanders. I’ve engaged TRK mode immediately after entering a direct to waypoint knowing I’m centered on course with same results. Unacceptabl.
Anyone experienced same issues or might offer some direction? Frustrated in Texas

I’m on vacation however I‘ll pm you later today -
just need to know if you’ve done the Servo neutral cal & checked that there is no slop in the aileron linkages?

 

[Jayp]

Thanks Jake, aileron check will be done tomorrow. Appreciate your help, will share our findings

 

[CanucksUnlimited]

Just to add to this - there is a service bulletin:
https://cdn.shopify.com/s/files/1/0..._Pilot_Autopilot_Servo_Mod_1.pdf?v=1745180536
I was having a similar problem, and they replaced the gear named in the bulletin and now it works really well.

 

[Rhino]

There are actually two service bulletins.

Documentation

Trio Autopilot Documentation

www.thestcgroupllc.com

 

[jakej]

Rhino - correct, depending on what equipmentsoftware Jayp has. IF the servos are going back for SB-001 then I’d suggest he has the SB-002 (Gear only) done at the same time - that’s a much more cost effective approach IMO .

 

[CanucksUnlimited]

I had forgotten about the software update - I had that done before the gear SB came out.

 

[Seansull]

Hi Jayp,
I have a PA 28-235 with a relatively new Trio install in Fort Worth (KFWS) . I'm no pro, but I spent a lot of time dialing mine in with input from Jeff at Trio. Happy to attempt to help out if I can. I can at least share my settings etc that are working.
Sean

 

[Jayp]

Thank you Sean, and I sure will contact you. I'm off on vacation next week so it’ll be mid August, but I’ll holler.
i live north of GDJ at XA86.
thank you

 

[Jayp]

Nice panel Sean!

 

[Seansull]

yours too!