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Thread: Fuselage Cabane Attach Point - Modification

  1. #1
    Grant's Avatar
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    Fuselage Cabane Attach Point - Modification

    Is there an approved mod/Beef-up that adds the saddle over the lateral fuselage tube that doubles up the thickness of this fitting?


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    www.SkupTech.com mike mcs repair's Avatar
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    i don't understand the question...(picture of bottom of cabane, but question about the top?)

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    Click on the picture and put it up full size.

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    Something like this. This would be a side view. Dotted lin would be the "Strap"

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    Last edited by Grant; 07-19-2020 at 10:10 AM.
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    www.SkupTech.com mike mcs repair's Avatar
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    Would have to remove floor to install. Probably easier to just make upper safety cable lug catch both bolts


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    Grant's Avatar
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    It's a rebuild so it'll be easy to access.
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    Are these things breaking in rough service? I thought it was the bolts that were worrisome.

    I don't do safety cables, but my impression is that a properly installed set of safety cables would save you from almost any kind of gear failure.

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    wireweinie's Avatar
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    Sounds like something that you can add during the repair.

    Web
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    AkPA/18's Avatar
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    If I understand the modification correctly, you might have an issue with float installations.
    http://thrustline.com/

    Takeoffs are optional--Landings are mandatory
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    supercrow's Avatar
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    Quote Originally Posted by AkPA/18 View Post
    If I understand the modification correctly, you might have an issue with float installations.
    Good Point. If you made the wrap of 4130X.040 you would add a considerable amount of strength and would only have to relieve a very small amount in the alum. float blocks. Even thinner would add a lot of strength to that area.

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    Grant's Avatar
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    Quote Originally Posted by AkPA/18 View Post
    If I understand the modification correctly, you might have an issue with float installations.
    This "Strap" would only double the Cabane V mount. The float fittings just attach to the MLG part.

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    Agreed Grant. The alum fitting for the front cross wires would have to be thinned just slightly.

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    If you're going around the outside only, would only need a little longer 5/16 bolt.

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    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by bob turner View Post
    Are these things breaking in rough service? I thought it was the bolts that were worrisome.

    I don't do safety cables, but my impression is that a properly installed set of safety cables would save you from almost any kind of gear failure.
    Yes the ears rip off.

    Top safety cable must be made to a tight fit for it to be useful, most aren’t




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    If this happens a lot, it seems like a "fix" would be off the shelf from Atlee or CC? Why has this not been addressed before?

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    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by bob turner View Post
    If this happens a lot, it seems like a "fix" would be off the shelf from Atlee or CC? Why has this not been addressed before?
    that's what the Atlee upper safety cables were intended to fix.... just the implementation as of late is too loose....

  17. #17
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by AkPA/18 View Post
    If I understand the modification correctly, you might have an issue with float installations.
    now that I think of it... the "repair" of torn off ears also would have that problem.... weld back on ears then weld on thicker doubler beyond tear......

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    BC12D-4-85's Avatar
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    I like the double tab in #5. To make a straighter pull to the lower fitting it may take being a triangle with a third hole for the cable.

    Gary

  19. #19
    Steve Pierce's Avatar
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    Airframes fittings are double thickness which can be an issue on some float installs. I was thinking a strap cut out and drilled between the gear attach and cabane attach fitting that simply bolts on. We discussed it here years ago.
    Steve Pierce

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  20. #20
    RaisedByWolves's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    Airframes fittings are double thickness which can be an issue on some float installs. I was thinking a strap cut out and drilled between the gear attach and cabane attach fitting that simply bolts on. We discussed it here years ago.
    If I remember right CubCrafters has a bulletin for early carbon cubs and sport cubs to add a doubler on the fitting

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    Here's the CC bulletin. Looks straightforward to me. Can't

    speak to the float interference issue...

    http://cubcrafters.com/c/wp-content/...11/SB00010.pdf

    Randy


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  22. #22
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    Not necessarily "approved" but you can buy the doubler plates and bushings to weld on stock gear fittings to make them "heavy duty". Total parts cost about $50 per gear fitting plus your time for fitting/welding them on.

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