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Thread: Donut Replacement hours?

  1. #1

    Donut Replacement hours?

    Dear Fellow Mouse-Flyers,
    I think I have secured a set of donuts for dear old 81N. Will find out
    shortly whether I got the parts. In order to budget the total cost,
    I'm wondering if you who have undergone the transplant can share with
    me the labor hours you were billed.
    Also, I am thinking it would be better to have this done by someone
    who has done it before (and recently) rather than an
    "earn-while-you-learn" guy. Any thoughts? What about support
    brackets for the plane while the legs are off? I'm looking for the
    way to do this right the first time.

    Thanks!
    David


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  2. #2

    Donut Replacement hours?

    >I think I have secured a set of donuts for dear old 81N.
    >In order to budget the total cost, I'm wondering if you who have undergone
    >the transplant can share with me the labor hours you were billed.

    There are so many factors that it is hard to nail down the cost.

    The pucks need "pre-installation compression", to prepare them to fit.

    The myriad of mechanical problems (rusted/stripped fasteners, loose
    jo-bolts, corrosion inside gear leg casting, cracks/damage to steel support
    on spar, etc.) that can be encountered in the teardown phase can easily
    destroy the most carefully prepared estimates.

    That being said, probably 4-5 hours per gear leg is a realistic starting
    point for a 40 year old plane, and a mechanic getting gray around the edges
    that doesn't move as fast as he used to. <G> However the need for OS
    Jo-bolts or some other SNAFU will easily double that estimate, especially
    if you have some trip scheduled with a deadline....

    >Also, I am thinking it would be better to have this done by someone
    >who has done it before (and recently) rather than an
    >"earn-while-you-learn" guy.

    As with most things, if you have done it before (and recently), and have
    the proper tools, you probably cut the time in half. However the supply of
    Beech savvy mechanics is sparse, and not everyone has someone close by that
    can claim experience in all phases of Beech maintenance.

    >What about support brackets for the plane while the legs are off?

    Clean and prime. Inspect for cracks, corrosion, etc. while you can see them.

    Bob Steward, A&P IA
    Birmingham, AL


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