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Thread: Leaking airmaster prop

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  1. #1
    Monty's Avatar
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    Default Leaking airmaster prop

    I have a Airmaster CS prop on my Kitfox that has been leaking grease since new. I now have over 100 hours and still leaking grease. I was never able to get answers from anyone. I finally found buried on the Airmaster website they have just recently issued Service Bulletin APL-SB18 and have acknowledged this is an issue. If you are having the same issue you can get a larger O-ring from Airmaster to fix the problem according to the SB.
    Kitfox Model SS7 E-AB
    Airmaster CS
    G3X touch

    Rotax 912 IS
    Eastern Missouri

  2. #2
    Administrator DesertFox4's Avatar
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    Default Re: Leaking airmaster prop

    Hope that stops the messy prop issue Monty. I remember seeing a little grease on that prop after flying it.


    DesertFox4
    Admin.
    7 Super Sport
    912 ULS Tri-gear


  3. #3
    Monty's Avatar
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    Default Re: Leaking airmaster prop

    Quote Originally Posted by DesertFox4 View Post
    Hope that stops the messy prop issue Monty. I remember seeing a little grease on that prop after flying it.
    Yes it has become worse not better. Have to remove the spinner every 3-4 hours and clean it. At least I have found the answer now. Now we will see how Airmaster responds.
    Kitfox Model SS7 E-AB
    Airmaster CS
    G3X touch

    Rotax 912 IS
    Eastern Missouri

  4. #4
    Senior Member PapuaPilot's Avatar
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    Default Re: Leaking airmaster prop

    I saw a part number for the o-rings in the post that looks like it is an Airmaster part number. It would be good to see if there is another common o-ring part number on them and post it on the forum. If you have this number then anybody could order them from places like Aircraft Spruce probably for a lower price.
    Phil Nelson
    A&P-IA, Maintenance Instructor
    KF 5 Outback, Cont. IO-240
    Flying since 2016

  5. #5
    Senior Member
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    Default Re: Leaking airmaster prop

    Phil,

    I asked them for a stateside option. They instead sent me the new o-rings via DHL. Just got them today. I'll compare them to the originals and report back.

  6. #6

    Join Date
    Sep 2019
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    Tulsa, OK
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    Default Re: Leaking airmaster prop

    Any update on this?

    Thanks

  7. #7
    Senior Member
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    Default Re: Leaking airmaster prop

    The new o-rings appear to have fixed my leak. I have about 20 hours since replacing them. No leaks.

  8. #8
    Senior Member kmach's Avatar
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    Cupar, SK, Canada CLC4 Loon Creek Airfield
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    Default Re: Leaking airmaster prop

    Is it the large o rings on the blade retention nuts going into the hub ?
    Kevin,

    Kitfox Outback
    912 ULS
    Airmaster AP332CTFH-WWR70W
    Summit Aircraft Wheel Skis
    C-FOXW

  9. #9
    Monty's Avatar
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    Default Re: Leaking airmaster prop

    Yes it is. The O Ring just under the large black retention ring.
    Kitfox Model SS7 E-AB
    Airmaster CS
    G3X touch

    Rotax 912 IS
    Eastern Missouri

  10. #10
    Senior Member
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    Nov 2013
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    Boise, ID
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    Default Re: Leaking airmaster prop

    Thanks for the heads up. Mine was leaking but I tightened to flange nuts thinking that was the issue. I’ll send them an email. I love that prop and they’ve been quick to answer.

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