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Thread: Broken rib under fuel tank

  1. #1
    Pacer42Z's Avatar
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    Default Broken rib under fuel tank

    I thought I had a couple of stitches that broke holding the fabric to the first rib under the fuel tank on the right wing of the Pacer. However, after I cut the fabric I found that the screw was missing securing the rib to the front of the rear spar. This allowed the rib to vibrate and over the years it broke.
    To repair the rib, I made a brace to slide over the rib and then riveted it to the rib. Took a little piece of aluminum and used simple hand tools and a vise to form the brace. Turned out very nice. Then of course there is all the fabric work and painting.

    Juergen
    Pacer N3342Z
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  2. #2
    Administrator Steve Pierce's Avatar
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    Default Re: Broken rib under fuel tank

    Do you think vibration shook the screw out or it was missing from previous work? Nice fix.

  3. #3
    Pacer42Z's Avatar
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    Default Re: Broken rib under fuel tank

    There was no evidence of a screw. No scratch marks on the rib and I couldn’t see the threads in the screw hole for all the dirt in it. I believe it was missed putting in when the rib was installed.

    Juergen
    Pacer N3342Z

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    Administrator Steve Pierce's Avatar
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    Default Re: Broken rib under fuel tank

    Another reason to look things over several times before we recover. Thanks for the pictures of your repair. I am sure it will help others. I have seen quite a few broken ribs in this area.

  5. #5
    Pacer42Z's Avatar
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    Default Re: Broken rib under fuel tank

    That area gets beat up by the prop wash quite a bit. When you find the broken ribs, are they mostly broken close to the spars?

    Juergen
    Pacer N3342Z

  6. #6
    Administrator Steve Pierce's Avatar
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    Default Re: Broken rib under fuel tank

    Yes, found several on pre-buy inspection and also at rebuild. My Clipper had cracks but was not broken yet when uncovered for rebuild. I went ahead and installed Dakota Cub tank bay ribs under the fuel tank all the way around to eliminate further issues.

  7. #7
    Pacer42Z's Avatar
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    Default Re: Broken rib under fuel tank

    I’ll keep that in mind when I recover the wings.

    Juergen
    Pacer N3342Z

  8. #8
    Gilbert Pierce's Avatar
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    Default Re: Broken rib under fuel tank

    Quote Originally Posted by Steve Pierce View Post
    Another reason to look things over several times before we recover. Thanks for the pictures of your repair. I am sure it will help others. I have seen quite a few broken ribs in this area.
    I recently had two of them that Steve found. Cracked where they attached to the rear spar.

  9. #9

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    Default Re: Broken rib under fuel tank

    were these ribs directly under the tanks?

  10. #10
    Pacer42Z's Avatar
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    Default Re: Broken rib under fuel tank

    Quote Originally Posted by bobbynick@msn.com View Post
    were these ribs directly under the tanks?
    Mine was directly under the tank.

    Juergen
    Pacer N3342Z

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