Help STC, Rudder trim is already installed on J model

[Himark]

My son and I have been rebuilding a 77 J model that we bought couple years back.   BTW, the prior owner was a A&P IA.... The prior owner passed away and his kids trashed all his personal belongings AND the log books to this airplane.    Well with everything being overhauled and or new we are getting close to done.    BUT, the aileron and the rudder have had a trim tab added.    We found the aileron trim tab and servo paperwork and is by aero-trim so that STC is handled.  However, the  rudder has a adjustable by a link not a servo trim tab.    Before we remove it has ANYONE seen these before and or have any knowledge of a existing STC?

 

I will get some pics posted 

Edited May 30, 2024 by Himark

[Shadrach]

Have you ordered the aircraft’s FAA airworthiness documents? Anything submitted to a FSDO should be should be in the record. For $10, it’s a low risk investment.

https://www.faa.gov/licenses_certificates/aircraft_certification/aircraft_registry/copies_aircraft_records

[N201MKTurbo]

Was a 337 filed for it?

[Himark]

Yes, we have the FAA packet gold seal and no 337 for that trim 

[Grant_Waite]

1 hour ago, Himark said:

My son and I have been rebuilding a 77 J model that we bought couple years back.   BTW, the prior owner was a A&P IA.... The prior owner passed away and his kids trashed all his personal belongings AND the log books to this airplane.    Well with everything being overhauled and or new we are getting close to done.    BUT, the aileron and the rudder have had a trim tab added.    We found the aileron trim tab and servo paperwork and is by aero-trim so that STC is handled.  However, the  rudder has a adjustable by a link not a servo trim tab.    Before we remove it has ANYONE seen these before and or have any knowledge of a existing STC?

 

I will get some pics posted 

I also have a 77J. Except mine just has the Aerotrim rudder trim, not the aileron. I’m assuming your’s has both because of a lack of autopilot. I wouldn’t see the aileron trim being necessary ever in our planes. I can’t tell from the picture what your rudder trim looks like but mine is just a tab about half way up the rudder with the linkage to the servo box. The servo is riveted on the outside of the rudder. I can send you the stc or 337 forms for mine. But from what you describe it’s not the Aerotrim. Mine uses an electric toggle switch with an indicator of left and right trim. Nothing like what you describe. The previous owner didn’t want to pay for the Stec 55x yaw damper, so he opted to add the Aerotrim instead. Having flow without it for the last few weeks, I can say I miss it. It’s nice in long climbs to be able to trim it out and not have to hold right rudder. You can see the tab painted in gold and the servo box.