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Elevator trim tab play
Fixed the elevator trim tab to the hinge and attached the motor and actuator. With the clevis pin in place I have about 0.5mm of play. The pin is very slightly loose in the trim tab horn. Is this acceptable?
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After couple thousand hours of flying I had considerable play in elevator trim tab due to an elongated hole. I fly an RV9A. A good friend of mine machined a bushing out of a rivet. Fits perfect feels tight. Thanks Julian! :)
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"No"
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Good catch, by the way! Best, Mark |
When you say 0.5 mm play, is that at the trailing edge? I had about a 1/16 inch play at the trailing edge after 390 hours. I found the trim tab hole was about 3 one thousands inch larger than the clevis pin diameter. After reading your post, I fabricated a press fit clevis pin and now have no trailing edge play. I will be interested to see if its easier to hold altitude accurately.
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Yes, at the trailing edge.
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If my math is correct .5 mm is less than .020 "
.020 " free play at the the trailing edge is totally fine. |
Thanks for all the replies. Is there a limit for this?
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In service experience and GVT testing (on an airplane that for the test had ~ 1/16" play) has shown it to not be very critical with even quite a bit of play assuming aircraft VNE limits are complied with.
I think a conservative limit would be .032 or 1/32". |
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