Here is the elevator trim tab, and you see it's connected with a clevis pin. Originally I had the split pin facing the other direction, and was worried that as the trim tab went down that the pin may get caught against the edge of the elevator and get pushed out.

Right now it seems like a non-issue since it's facing the other way, but what if it works its way around?

Possible solutions?

1. Widen the hole so that cannot reasonably happen.

2. Tape the pin to the rod

3. Use safety wire instead of split pin 

Has anyone put any thought into this or have any experience? Is this a legitimate concern?

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To be clearer, here's an illustration

Mark,

That is or should be a cotter pin (split pin as you call it) that goes through the clevis pin hole. The cotter pin should be installed where both of the legs of the split go through the hole in the clevis pin. The legs are then bent back around each side of the clevis pin so that the cotter pin cannot come out.

I see now, thank you!  I knew I was doing something wrong, and clearly haven't worked with anything utilizing cotter pins before.

A quick Google image search painted a perfect picture of what you're describing (e.g. http://aviationmiscmanuals.tpub.com/TM-1-1500-204-23-6/img/TM-1-150...)

Thanks again.

You may want to check out the EAA video on this subject I think they have more than one on using cotter pins.

All of these EAA Hints for Homebuilder Videos are excellent, they started these back in 2005 or 2006 and  now there are quite a number of them, all very informative.

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