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Thread: K3 lift strut attach thread

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  1. #1
    Senior Member Dusty's Avatar
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    Default Re: K3 lift strut attach thread

    I will post a photo when I figure how to post online.
    The corrosion is only surface.I had an ac engineer take a look ,he wasn't overly concerned but recommended a cleanup &crack test. His concern was how the thread was formed, If it was machined rather than rolled? There is potential for a crack to form.If the threaded portion is replaceable ,easy fix.His suggestion is to convert to a threaded plug with a male rod end.
    Has this been done by any any builders?

  2. #2
    Super Moderator Av8r3400's Avatar
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    Default Re: K3 lift strut attach thread

    Kitfox uses a welded in AN fitting like this: Link

    These are NOT a cut thread.

    In the "bad old days" Avid used a welded in socket head cap screw for some threaded rod ends. Not strictly by the FAA Book, but functional. Still they were a rolled, not cut thread.
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  3. #3
    Senior Member jrevens's Avatar
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    Default Re: K3 lift strut attach thread

    They seem to have sort of a black oxide finish, and look a lot like they may be common threaded rod - hopefully Grade 8. They sure don't look like those plated AN490 rod ends. Anybody know for sure?
    John Evens
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  4. #4
    Senior Member jrevens's Avatar
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    Default Re: K3 lift strut attach thread

    Quote Originally Posted by jrevens View Post
    They seem to have sort of a black oxide finish, and look a lot like they may be common threaded rod - hopefully Grade 8. They sure don't look like those plated AN490 rod ends. Anybody know for sure?
    Actually, I believe I was thinking of the horizontal tail struts... sorry!
    John Evens
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  5. #5
    Senior Member Dusty's Avatar
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    Default Re: K3 lift strut attach thread

    Thanks for the information,it does look like the item from ac spruce
    This puts my mind at ease,but i will crack test before the next annual!

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