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Filiform Corrosion

I have a 1963 V-Tail that has some filiform corrosion on the ruddervator . Can the ruddervator be replaced or re-skinned with aluminum on the v-tail?
What do you recommend as a way to fix the filiform corrosion issue?

Model: Bonanza P35
Posted 12/3/2023 - 2 months ago
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No sir, Aluminum skins are not approved for the V Tail aircraft, only straight tail Baron, Bonanza, and Debonair aircraft.
The best way to treat Filiform is to remove the ruddervator, strip all of the paint off so a detailed inspection of the skin can be completed. If everything is satisfactory and there are no pin holes in the skins you can have the ruddervator treated, painted and rebalanced before installation.
If issues are present, new Magnesium skins are available at Textron to replace the original skin.

Bob Ripley
ABS Technical Advisor

Posted 12/3/2023 - 2 months ago
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Adding to Bob's answer.

These skins are only 0.020" thick. Maximum loss of thickness is 10%; pitting can exceed that easily, so there is a judgement call on how deep it is, but definitely pin-holes exceed that 10%

Mike
ABS Technical Advisor

Posted 12/3/2023 - 2 months ago
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Br prepared to give up your 1st born child to purchase those skins from Textron. They are few & far between on the used market, but they can be had, albeit still at a grossly inflated price. But if you need them - you need them. Good luck.

Posted 12/3/2023 - 2 months ago
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If you can’t find it. I can e-mail you a .pdf copy of the article I wrote in the ABS magazine on ruddervator corrosion control.

Posted 12/3/2023 - 2 months ago
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Steve - - what month and year of the ABS magazine? Thanks.

Nelson Amen
San Antonio, Texas

Posted 12/3/2023 - 2 months ago
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July 2021 Nelson.

Posted 12/4/2023 - 2 months ago
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In reply to: Steve Zeller | 12/3/2023 - 2 months ago

If you can’t find it. I can e-mail you a .pdf copy of the article I wrote in the ABS magazine on ruddervator corrosion control.

My e mail is CraigFortson@aol.com
Please e-mail me your PDF file
Thank you!

Posted 12/11/2023 - 2 months ago
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Posted 12/11/2023 - 2 months ago
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Thanks Mike. I also e-mailed it to him. In other news, I have been shopping for a paint shop. Interesting how many shops won’t answer questions or discuss refinishing ruddervators…

Posted 12/12/2023 - 2 months ago
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Filiform Corrosion