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Old 12-20-2018, 08:50 AM
starkw1 starkw1 is offline
Join Date: Feb 2005
Location: Plymouth, MN
Posts: 33
Default Dynon Servo shear screw replacement

I had broken shear screw on the pitch and roll servos in my -7 this past summer. At first, I noticed that the AP would not hold altitude, occassionally at first, then more frequently. After I replaced that shear screw, I discovered the shear screw in the roll servo was also broken when I was trouble shooting a frequent AP disconnect. No AP flight anomolies associated with the broken roll servo shear screw that I could detect; the frequent AP disconnect was apparently due to some conbination of a faulty roll servo circuit board and/or intermittant ground.

Dynon indicates that their new shear screws are more robust that the early ones.

RV-7, 300 hrs
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Old 12-20-2018, 07:09 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,460

Any idea of when Dynon went to the new more robust design?
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Old 12-21-2018, 05:41 PM
Don Jones's Avatar
Don Jones Don Jones is offline
Join Date: Nov 2005
Location: Snohomish, Washington
Posts: 677
Default New Design Shear Screw

The new design shear screw was available late in the 1st quarter of 2017. It was a redesign due to a premature fatigue failure of the old design screw during normal use.
Don Jones
Technical Support Manager
Dynon Avionics
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Old 12-21-2018, 10:07 PM
ben barron ben barron is offline
Join Date: Sep 2013
Location: Fall City, WA
Posts: 118

With a call / email to Dynon tuesday, they sent the new roll servo shear screw via USPS so i recieved it 2 days later. The part came with lockTite, Allen wrench and cotter pin all at no cost. Thatís great service.

It was Easy install in place.

My question now is with a 2015 vintage servo should i be changing out the pitch servo shear screw? I would like to avoid failure in flight when i need it.
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Old 12-21-2018, 10:29 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,460


Same thing I am thinking. My servos were installed in 2012 and have 800 hours on them. Sounds like I should replace them at annual.

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