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Thread: Ski sign off question

  1. #1

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    Ski sign off question

    Hello:
    I just finished installing my skis on my plane. I made new SS cables (1/8"), made new bungie cords (1/2") that at I got from Stoddards. I installed new longer bolts in my landing gear due to the brackets needed. I followed AC 43.13-2B chapter 5 for installation guidance. I did use Federal 11A109 retaining washers to hold the skis on the axle. I weighed my skis and they weigh 14.5 pounds each, and my tires weigh 17 pounds.


    My question is this...since these are federal A1500 skis and are on the TDC, can an A&P sign off the installation (I am not a certified mechanic, but have been working on my own planes for 16 years)? Also, it is my guess that the equipment list and weight an balance will also need to be updated. Is this all the paper work that will be involved for my to legally fly?


    Thanks, Bob
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  2. #2
    mvivion's Avatar
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    Bob,

    Yes, an A and P mechanic can sign off those skis. He'll want to work a new w/b and equipment list, assuming you have one (and you should). Other than that, go have some fun. Just remember to take along good cold weather camping gear.....

    MTV

  3. #3
    cubdriver2's Avatar
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    I think you just need a new W&B and I think you can put them on and off yourself?

    Do yourself a favor before you fly it. Go out where the struts meet the wing and lift one side up off the ground and make sure it looks like it should in a flying attitude to proof your work.

    Glenn
    Last edited by cubdriver2; 01-03-2017 at 11:04 PM.
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"

  4. #4

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    I believe the regs say that after the first sign-off then you are legal to do it yourself.Just how I understood it.

    Bill

  5. #5
    mvivion's Avatar
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    Quote Originally Posted by willyb View Post
    I believe the regs say that after the first sign-off then you are legal to do it yourself.Just how I understood it.

    Bill
    Ive always understood this to be the case. That said, you'll always find folks who say that installing/removing skis is not a "preventive maintenance" item. But, for sure, that initial install needs to be signed off by a certificate mechanic.

    MTV

  6. #6

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    Is it allowed as owner maintenance?

    Replacing wheels and skis where no weight and balance computation is involved. Enough said.
    Item #18 in the linked document.

    https://www.aopa.org/training-and-sa...ve-maintenance

  7. #7
    BC12D-4-85's Avatar
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    P/M as long as no hydraulic fittings are involved. Given that most owners put a temporary hose clamp over expanding brake pads or insert a spacer in disc calipers and leave them installed as is...no hydraulics are wrenched. That's what my I/A says and he knows lots more than I ever will.

    GAP

  8. #8
    wireweinie's Avatar
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    As per stewartb's statement.

    Look at Part 43, appendix A, (c) preventive maintenance. Line 18 states "Replacing wheels and skis where no weight and balance computation is involved." That means that the first time you switch to skis, you need to work up a new weight/balance sheet and you need to be an A&P to make that official. That's where the 'first time' idea comes from. Once you have a weight/balance sheet for wheels and for skis, as the owner/operator, you can switch back and forth as necessary and log that as preventive maintenance noting which weight/balance sheet you are now using.

    Web
    Life's tough . . . wear a cup.

  9. #9
    Dave Calkins's Avatar
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    A mechanic whould sign off the ski rigging fabrication also.

    A&P or IA???

  10. #10
    wireweinie's Avatar
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    A&P.

    Web
    Life's tough . . . wear a cup.

  11. #11
    S2D's Avatar
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    Quote Originally Posted by Dave Calkins View Post
    A mechanic whould sign off the ski rigging fabrication also.

    A&P or IA???
    If its on the TC an A&P will suffice. If its not, you be the judge .............
    I may be wrong but that probably won't stop me from arguing about it.

  12. #12

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    I have worked up some equipment lists and W&B for the mechanic to sign off on. Do these look official?

    Cub weight and balance extremes.pdf
    Cub equipment List.pdf
    Cub weight and balance history.pdf

    Thanks for checking up on me.

    Peace

  13. #13
    BC12D-4-85's Avatar
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    Quote Originally Posted by Marshmallow View Post
    I have worked up some equipment lists and W&B for the mechanic to sign off on. Do these look official?

    Peace
    Better check...I think the RU's have hacked your PC.

    GAP

  14. #14

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    Damn they got me...
    I posed this on the J3 forum also. The files work there.

    http://www.j3-cub.com/forum/showthre...321#post301321

  15. #15
    spinner2's Avatar
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    Good to see you're getting close Bob.

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    This was yesterday on the Noxon reservoir. It was all sun, about 0º and just a little east wind. Oh and all fun.

    I meant to ask before, do you have sea plane lifting eyes? It sure makes it easier to swap over to skis with the chain hoist. If you don't, consider installing a set.
    "Fast is fine, but accuracy is everything." Wyatt Earp

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