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.

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

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Originally Posted by DesertFox4

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

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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.

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

Yes it is. The O Ring just under the large black retention ring.

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.

Let me know if you get an answer. They have only answered one of my e-mails. My question is How can I get 3 of the larger O rings ((PO414-232)? and will Airmaster pay for the repair. If you find out please let me know and I will do the same.

I’d personally just be happy to get the correct O-ring size. You should be pulling and greasing your blades yearly anyway but I’ll let you know.

Yes I agree with that

Monty,

I’ve been in contact with Airmaster. They are asking me to measure gaps on the hub. Did the new o-rings solve your issue and do you know of a stateside supplier?

Update should anyone else be running an Airmaster. New o-rings enroute.

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,

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.

Any update on this?

Thanks

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