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Garmin GFC 500 Autopilot issues


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Not sure if I have reported this here before but I had to replace a roll servo due to a bad bearing. The GFC 500 was installed September 2019. Still under warranty part and labor was covered.Servo failed on a flight back from NH to NJ.

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1 hour ago, ArtVandelay said:

What is the length of Garmin’s warranty?

 

On 5/30/2021 at 10:14 AM, Warren said:

Here is the link to the Garmin Warranty Policy

https://www.garmin.com/en-US/legal/aviation-limited-warranty/

The GFC500 is a non-TSO product.  Looks like this means 1 year, 400 hour warranty.

from an earlier post, take care

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On 5/24/2021 at 7:24 AM, alextstone said:

Garmin should be able to tell what the fault is from data logs.  In my case, I was having the same failure modes due to YD disconnects... Still not fully resolved.  Are you flying a long body?

Sorry, for slow response , no it’s a J , servo replaced but issues still exists , Garmin has had file for over a week, I think the servos are under powered I hope I’m wrong. 2 months with this issue 

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13 hours ago, chan65 said:

Sorry, for slow response , no it’s a J , servo replaced but issues still exists , Garmin has had file for over a week, I think the servos are under powered I hope I’m wrong. 2 months with this issue 

Yes, I suspect that is the case too at least with the YD servo.  I've learned that I must pay careful attention to re-setting the rudder trim in each phase of flight THEN engage the YD on the servo and even with that, I find that it still occasionally adversely disconnects.  

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  • 1 month later...

Thought I had posted update,  second servo replaced , and thus far about 10 hours in no issues. 

Servo was bad, replaced with a new one, that one was bad as well ( seems odd ) avionics sad they often use refurbished servos for warranty parts. This time avionics insisted on replacing it with brand new servo. My gut tells me this servos are underpowered and we will see failures between 200-300 hours. I hope I'm wrong and this is behind me, it cost me the whole summer of flying and several trips cancelled.

 

hoping this is behind me,  grateful for my Avionics man 

Edited by chan65
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There is very little resistance in the trim system….

Older systems use a brake to keep it from changing on its own…

Not sure what the newer systems with an AP use… but the trim wheel moves pretty easily in the M20R…

Kind of amazing with all of the forces acting on the system…

Best regards,

-a-

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6 hours ago, carusoam said:

There is very little resistance in the trim system….

The question might have been directed at the planes that have servo failures, with said resistance proposed as a factor contributing to the failures...

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4 hours ago, PT20J said:

GFC 500 servos have a torque setting (percent maximum) that is part of the STC installation configuration for each airplane. Does anyone happen to know what the values are (pitch, roll, yaw, trim) for Mooneys?

For the M20J, Pitch max torque 85%, Roll max torque 90%, Yaw max trim 100%

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32 minutes ago, ArtVandelay said:


I would have expected the pitch 100% for a couple of reasons.
We’ve had some members that had pitch oscillation issues.
Js have springs on the elevators controls.

Actually, they all have springs: Up through the J trim assist bungees were used which provide both up and down springs with with a variable centering connected to the trim system. Starting with the more nose heavy K, bobweights with a variable downspring attached to the trim system were used. But, near the trim point, the springs have little effect.

There are also aileron/rudder interconnect springs.

Two sources of control friction in Mooneys are the control column eyeballs and poorly lubricated trim components.

Skip

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