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Thread: CGMTT Nose Gear

  1. #1
    Guest
    Guest

    CGMTT Nose Gear

    Guys, thanks for all the help with the spinner and strobe question.
    Now the problem seems to be excess play in the nose gear. Some
    bushings were replaced last year but the problem now seems to be
    where the main Nose Gear Leg attaches to the housing. This is where
    the large brass bushings go. These large bushing ride inside two steel
    (looks like steel) insets that are pressed into the housing top and
    bottom and in our case held in place with 3 split pins. The split
    pins had sheared off once before and you can see where new holes were
    drilled and new pins installed. The trouble is that the housing is
    worn and thes steel bushings are no longer pressed in or fit tight.
    that means that they will pop off the pins and then there is
    excessive play in the nose gear both forward and aft and side to
    side.

    I realize this is a crude description but I am sure if someone else
    has experienced this problem then they will recognize it. My AME
    wants to get an EO (Engineering Order) done in order to repair this
    with either an over sized bushing or by having the housing machined
    and a second bushing or spacer permanently installed to take up any
    slack. Sounds like allot of work and I know the way these guys charge
    it will be an expensive repair.

    Just so you know the housing is not available from Raytheon until
    March 2008 and the price is like $8-9,000. So basically it is
    unavailable. The steel bushings are available but not in an oversize
    and since the housing is already worn beyond the original spec this
    would not help. The suggestion from our AME is to complete this
    repair with an EO from a Ministry approved person (DAR) and then also
    replace all the brass bushings in the nose gear in order to take up
    the slack.

    The question is: Is there and approved repair available for this, and
    does anyone know of a shop that can do this sort of repair? If so
    would it be a PMA repair or not.

    Thanks,

    Bruce Dwyer
    C-GMTT



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  2. #2

    CGMTT Nose Gear

    I have the same problem and am also looking for answers. I've looked
    at the BAC site. A "technical editor" posted some information and
    even indicates that they do the repair but I don't see any contact
    information.

    There is a discussion about using epoxy to seat the lower bearing and
    then shim the play out (I guess they mean vertically). The same
    article also indicates that someone has the machine drawings from Beech.

    If I could get the Beech drawing, I could machine new bearings or at
    least machine bearing spacers. I wonder if it possible to work with
    an A&P/IA, could I machine and install new bearings? That seems like
    a better fix than shimming.

    I've ordered Marine-Tex epoxy to seat the lower bearing (as per the
    article in BAC).

    I sure would like to have the Beech drawings.

    --- In musketeermail@yahoogroups.com, "dwyer_bruce" <dwyer_bruce@...>
    wrote:
    >
    > Guys, thanks for all the help with the spinner and strobe question.
    > Now the problem seems to be excess play in the nose gear. Some
    > bushings were replaced last year but the problem now seems to be
    > where the main Nose Gear Leg attaches to the housing. This is where
    > the large brass bushings go. These large bushing ride inside two steel
    > (looks like steel) insets that are pressed into the housing top and
    > bottom and in our case held in place with 3 split pins. The split
    > pins had sheared off once before and you can see where new holes were
    > drilled and new pins installed. The trouble is that the housing is
    > worn and thes steel bushings are no longer pressed in or fit tight.
    > that means that they will pop off the pins and then there is
    > excessive play in the nose gear both forward and aft and side to
    > side.
    >
    > I realize this is a crude description but I am sure if someone else
    > has experienced this problem then they will recognize it. My AME
    > wants to get an EO (Engineering Order) done in order to repair this
    > with either an over sized bushing or by having the housing machined
    > and a second bushing or spacer permanently installed to take up any
    > slack. Sounds like allot of work and I know the way these guys charge
    > it will be an expensive repair.
    >
    > Just so you know the housing is not available from Raytheon until
    > March 2008 and the price is like $8-9,000. So basically it is
    > unavailable. The steel bushings are available but not in an oversize
    > and since the housing is already worn beyond the original spec this
    > would not help. The suggestion from our AME is to complete this
    > repair with an EO from a Ministry approved person (DAR) and then also
    > replace all the brass bushings in the nose gear in order to take up
    > the slack.
    >
    > The question is: Is there and approved repair available for this, and
    > does anyone know of a shop that can do this sort of repair? If so
    > would it be a PMA repair or not.
    >
    > Thanks,
    >
    > Bruce Dwyer
    > C-GMTT
    >




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  3. #3

    CGMTT Nose Gear

    >If I could get the Beech drawing, I could machine new bearings or at
    >least machine bearing spacers. I wonder if it possible to work with
    >an A&P/IA, could I machine and install new bearings? That seems like
    >a better fix than shimming.

    In the US (the original poster was talking about a Canadian registered
    plane) the FAA allows the owner/pilot or the mechanic working on the plane
    to make parts. Having drawings or reverse engineering the needed part is
    how it is usually done.

    The problem(s?) comes from not knowing the materials used in some
    cases. We are bound by the FARs to make a part that is the equal of the
    original, and without information on alloys, tempers, and post forming heat
    treating or chemical treatments, it is hard to definitively say that your
    owner produced part conforms to the original design.

    Without access to approved data, we are left with the requirement to obtain
    approval for our design. Your basic Field Approval on form 337 is what
    you'll need if you can't get the factory or a DAR/DER to sign off on the
    design.

    Bob Steward, A&P IA
    Birmingham, AL



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  4. #4

    CGMTT Nose Gear

    Wouldn't the drawing list the material spec?


    --- In musketeermail@yahoogroups.com, Bob Steward <n76lima@...> wrote:
    >
    >
    > >If I could get the Beech drawing, I could machine new bearings or at
    > >least machine bearing spacers. I wonder if it possible to work with
    > >an A&P/IA, could I machine and install new bearings? That seems like
    > >a better fix than shimming.
    >
    > In the US (the original poster was talking about a Canadian registered
    > plane) the FAA allows the owner/pilot or the mechanic working on the
    plane
    > to make parts. Having drawings or reverse engineering the needed
    part is
    > how it is usually done.
    >
    > The problem(s?) comes from not knowing the materials used in some
    > cases. We are bound by the FARs to make a part that is the equal of
    the
    > original, and without information on alloys, tempers, and post
    forming heat
    > treating or chemical treatments, it is hard to definitively say that
    your
    > owner produced part conforms to the original design.
    >
    > Without access to approved data, we are left with the requirement to
    obtain
    > approval for our design. Your basic Field Approval on form 337 is what
    > you'll need if you can't get the factory or a DAR/DER to sign off on
    the
    > design.
    >
    > Bob Steward, A&P IA
    > Birmingham, AL
    >




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  5. #5

    CGMTT Nose Gear

    All the data needed for the main nose gear bearings is available on
    BAC. It includes material and dimensions. Just search on 'brass
    stock' for the quickest 'find' in the FAQs.



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