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Thread: Track widths on PA-20

  1. #61

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    Default Re: Track widths on PA-20

    So, looks like you need to develop data that can be approved, either by Field Approval from FAA or a DAR, or get an 8110-3 DER approval. If your FSDO does field approvals, write it up using AC43-210A as your guide and submit it, wait until they get around to it, and you are done. If they donít do field approvals, then you will be paying a DAR or DER to do the approval. Not a big deal, just cost the customer some $$.


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  2. #62

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    Default Re: Track widths on PA-20

    That is correct. I have been aware of that need all along. My primary attempt here on this board was to obtain some data. Haven't had much luck at that though.

    Again I ask, can anyone provide:

    1 - 3 view photos of a MLG vee, preferrably un-covered with an additional photo of the axle from outboard (end view), side view and rear (Inboard) weld assemblies view of two different Gear Vees. PN 12582-00 and/or -01 for 1950 PA-20 and PN 12582-14 and/or -15 for the 1951 PA-20?

    2 - A copy of Drawing 12637 before revision K?

    3 - A copy of any other drawing of gear Vee's PN 12582-00, -01, -14 or -15?

  3. #63

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    Default Re: Track widths on PA-20

    Wes, write up what you have and Iíll look at it to see if it is sufficient. The airplane has been flying in this configuration since 1981, so I donít see a lot of risk in not having exact part numbers. My main concern is that with the wide gear you also need to verify the tailwheel spring bracket. Going from narrow gear to wide gear that angle changes. I think I sent you a previous gear approval I did, but that didnít have the wheels and brakes as that airplane maintained the 8.00x4 wheels and brakes. Use my previous write up as a guide and write up what you have in a similar format and email it to me. Letís not make this more complicated than it is!


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  4. #64
    Administrator Steve Pierce's Avatar
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    Default Re: Track widths on PA-20

    Between finishing up a multi year ground up rebuild on a Super Cub, including the paperwork and being sick I got some pictures this morning. This is a narrow PA20 gear. I welded the trailing edge fairings on this gear for a customer who thought he needed a narrow gear leg, turned out his was wide.
    1 1/4" axle, no inside sleeve.
    20191107_085808.jpg

    20191107_085815.jpg

    Bottom of axle showing gusset.
    20191107_085836.jpg

    20191107_085842.jpg

  5. #65
    Administrator Steve Pierce's Avatar
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    Default Re: Track widths on PA-20

    The tab Piper welded on to retain the wheel pant clamp on bracket.
    20191107_085902.jpg

    20191107_085919.jpg

  6. #66
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    Default Re: Track widths on PA-20

    Here is a comparison of a wide gear and a narrow gear with axles in the same plane.
    20191107_090000.jpg

    Quite a difference in length.
    20191107_090008.jpg

  7. #67
    Administrator Steve Pierce's Avatar
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    Default Re: Track widths on PA-20

    The other side, unmolested 1 1/4" narrow Pacer gear.
    20191107_090305.jpg

    20191107_090317.jpg

    20191107_090420.jpg

  8. #68
    Administrator Steve Pierce's Avatar
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    Default Re: Track widths on PA-20

    This is my Clipper gear, modified to 1.5" axles via Univair STC SA11RM.

    "Installation of modified axles, Cleveland P/N 40-84 wheels and P/N 30-41 brakes or McCauley P/N D-30291 wheels and P/N D-30118 brakes or Cleveland P/N 040-06000 wheels an P/N 030-06000 brakes in conformity with drawing listed on FAA stamped Light Plane Components Master Eligibility List Bulletin No. 1011-1 dated March 12, 1973 or subsequent FAA approved revision."
    Had to break out the Microfiche reader to get this as the STC is not in the paperwork I have.

    20191107_090705.jpg

    The bushing to offset the wheel is slid up over the axle threads in this picture.
    20191107_090718.jpg

    You can see the end of the 1 1/4" axle inside the 1.5" axle here.
    20191107_090943.jpg

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