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Thread: POLL: any interest in speed mods developed for A19-C23 model

  1. #1

    POLL: any interest in speed mods developed for A19-C23 model

    --- In musketeermail@yahoogroups.com, "Bob Swaim" <dswaim1119@c...>
    wrote:
    > At that point, find an IA who is willing to work with you and write
    > up a field approval 337.

    *** You can write up the field approval 337 yourself. You can present
    it to the FSDO yourself. After it is stamped "approved" by the FSDO,
    you then do the work and have the IA sign off on it.

    Of course, it's best to have an IA lined up before you start. I've
    been through this process a few times, and I found that with a stamped
    and signed field approval 337, it was easy to get an IA on board -
    seeing official signatures from up high gave my IA a good comfort
    level.

    As my FSDO inspector told me "Anyone can create data" - its up to the
    inspector to approve or disapprove it. And being a real paperwork nut,
    I spent far more time and effort on it than I could have afforded to
    pay an IA for. We're talking CAD drawings, itemized material lists,
    the aformentioned ICA, etc etc. I think it helped that when I brought
    the stuff in, it was obvious that I had done my homework - that I had
    done at least as much work as I was asking the FSDO inspector to do.

    It might not be a bad idea to head out to the FSDO and discuss the
    paperwork requirements before starting. Also, you should expect to
    do a couple of iterations of presenting paperwork and getting
    corrections before getting that magic stamp.

    You may have to come up with imaginative solutions to imaginary
    problems: I was doing an electrical mod to a Cessna once - the
    inspector asked "How will your ICA address maintaining the bus bars?
    You know that copper corrodes." My response was to specify bus bars of
    solid silver, because silver tarnish is conductive. And silver has
    better electrical & mechanical properties than copper, all around. So
    now there's a Cessna flying around somewhere with solid silver bus
    bars .

    - Jerry Kaidor ( jerry@tr2.com )





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  2. #2

    POLL: any interest in speed mods developed for A19-C23 model

    --- In musketeermail@yahoogroups.com, "jerrytr2com" <jerry@t...> wrote:
    > You may have to come up with imaginative solutions to imaginary
    > problems: I was doing an electrical mod to a Cessna once - the
    > inspector asked "How will your ICA address maintaining the bus
    bars?
    > You know that copper corrodes." My response was to specify bus bars
    of
    > solid silver, because silver tarnish is conductive. And silver has
    > better electrical & mechanical properties than copper, all around.

    Sounds like you got an inspector who was testing you. While ALL major
    alteration 337s now need to show Instructions for Continuing
    Airworthiness (ICA), AC43.13-1B still applies unless otherwise
    specified, just like the Beech mx manual. On ALL alteration 337s, I
    now write the first ICA in the idea of "The aircraft manufacturer's
    maintenance manual and AC43.13-1B describe how to inspect and repair
    this alteration, with the following exceptions..."

    If I got the question about corroding copper, I'd simply flip open
    AC43.13 to show him the answer. Hope this helps for your next one.

    Bob
    A&P, Aero Eng





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