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  #1  
Old 12-18-2018, 04:04 PM
ben barron ben barron is offline
 
Join Date: Sep 2013
Location: Fall City, WA
Posts: 115
Default Dynon Servo shear screw replacement

My roll servo stopped working on my last flight. Jeff at Dynon gave ma a simple test to confirm it was a failed shear screw, which I did. I now need to install a new screw. Has anyone out there done this? Can it be done in place? The new screw goes in a new hole. Will the servo re-set it self as the arm will be in a different location to align with the new screw?

Dynon sends out (at no cost) a new screw when you reach out and then fill out a form. http://Www.dyninavioniocs.com/guides...t_instructions rev_E.pdf
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Old 12-18-2018, 04:50 PM
woxofswa woxofswa is offline
 
Join Date: Sep 2007
Location: Mesa Arizona
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I’ve replaced both pitch and roll, but it’s not a big deal. Yes you need to remove the servo but getting access is pretty simple. Which hole you use is immaterial as when you are finished, you’ll go back into the software and run the setup app again.
BTW, at least in the RV10 servos, the replacement screws are noticeably beefier than the originals and I haven’t had any issues since.
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Last edited by woxofswa : 12-18-2018 at 04:55 PM.
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  #3  
Old 12-18-2018, 05:12 PM
ben barron ben barron is offline
 
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Appreciate the response...it does look like i may have access to do it in place on the RV12.
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Old 12-18-2018, 06:49 PM
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bruceh bruceh is offline
 
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Location: Ramona, CA
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Dynon has an instructional video of the process:

https://www.youtube.com/watch?v=4wFEY3kT97g
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  #5  
Old 12-19-2018, 08:16 AM
benfra benfra is online now
 
Join Date: May 2007
Location: ft MYERS, FL Based @KPGD
Posts: 16
Smile shear screw

I was able to replace the shear screw in place on the aft "roll" servo. One has to remove the arm by pulling the castle nut ,this gives access to three screw holes, use a new screw hole for screw and locktite. The arm will reposition its self . Was a lot easier not having to remove the servo. Works Great, Good Luck RV 12

Last edited by benfra : 12-19-2018 at 08:18 AM. Reason: add content
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  #6  
Old 12-19-2018, 11:07 AM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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For you guys who had broken shear screws can you attribute it to anything unusual or is the design just susceptible to the problem?
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  #7  
Old 12-19-2018, 12:02 PM
DHeal DHeal is offline
 
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Location: Windsor, California
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A couple of years ago I sheared the pitch shear screw in my RV-12. This was due to my over-enthusiastic movement of the stabilator during a period of aerial messing about. The shear screw is easily replaced using the Dynon-supplied kit. At that time Dynon told me that they had strengthened the shear screw to make such issues less likely. No problem since.
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  #8  
Old 12-19-2018, 01:46 PM
benfra benfra is online now
 
Join Date: May 2007
Location: ft MYERS, FL Based @KPGD
Posts: 16
Thumbs up shear screw

My shear screw broke because off runaway trim. I was correcting the condition before the autopilot was disconnected. My autopilot has been a problem trimming nose down and full left roll, so my immediate correction was needed! Dynon and I are fixing the problem. However it seemed to shear quite easily,worked safely and as designed. Ben
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Old 12-19-2018, 10:56 PM
RFSchaller RFSchaller is offline
 
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Thanks. I wanted to be sure Iím not doing something that might cause it to shear.
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  #10  
Old 12-20-2018, 08:49 AM
bobg56 bobg56 is offline
 
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Location: Peachtree City, GA
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The old shear screws are easy to shear, I once had a pitch issue and when I went to check to see if the screw was loose, all I did was checking with an allen wrench and it broke with very little tension applied.
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