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Thread: SB 819 Fuselage Door Frame Corrosion

  1. #1
    Administrator Steve Pierce's Avatar
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    Default SB 819 Fuselage Door Frame Corrosion

    Here is a recent picture of a PA22/20 fuselage front door post with the sheet metal removed. The rust was blasted off of the tube exposing some pitting. A sharp awl was stuch into the deepest pit and a slight tap penetrated the tubing. All of the sheet metal was cut off IAW Service Bulletin 819. The short welds were cut off in such a way that they could all be blasted, primed with weldable primer and reinstalled.
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    Last edited by Steve Pierce; 12-30-2010 at 02:22 PM.

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    Default Re: SB 819 Fuselage Door Frame Corrosion

    Here is the same tube on my Clipper. Good reason to comply with SB-819

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    Default Re: SB 819 Fuselage Door Frame Corrosion

    Those pictures are a great example of the old saying "A picture is worth a thousand words". Thanks for posting them. Congrats on the new site, it's going to be great.
    Fred

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    Default Re: SB 819 Fuselage Door Frame Corrosion

    Thanks Fred. Hopefully they will help someone else make the decision that it is a worth while service bulletin.

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    Default Re: SB 819 Fuselage Door Frame Corrosion

    I'm sure glad this is common knowledge! It wasn't to me until I cut the sheetmetal off the tubes this weekend and found the same thing. My airplane is a desert bird so the corrosion cleans up with emery cloth, but I can only imagine how many are flying that are bad.

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    Default Re: SB 819 Fuselage Door Frame Corrosion

    Found a spot of corrosion on the lower longerons at the tail brace wire attach fitting. Cut it off and this is how they looked underneath.

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    Default Re: SB 819 Fuselage Door Frame Corrosion

    Here is a parts list from Univair for the door channels parts that are effected by Service Bulletin 819. The part numbers with a 16 are for the Clipper and everything else is for the Pacer/Tri-Pacer. These do have to be trimmed on the Clipper.
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    Last edited by Steve Pierce; 01-25-2012 at 06:59 PM.

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    Default Re: SB 819 Fuselage Door Frame Corrosion

    Some corrosion found on a fuselage that was flying prior to a good inspection.
    100_0721.jpg 100_0702.jpg 100_0718.jpg
    Last edited by Steve Pierce; 01-25-2012 at 07:06 PM.

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    Default Re: SB 819 Fuselage Door Frame Corrosion

    Wow thats some lightweight tubing you found Steve!
    in the second pic you posted, 100_0718 -on the starboard side diagonal tube, it looks like some "creative welding" running up the tube, what is that?

  10. #10
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    Default Re: SB 819 Fuselage Door Frame Corrosion

    I recently got ahold of Dave Blanton's set of V6STOL Plans. He pointed out that water sometimes collects in the lower tubes and freezes solid in the winter. That certainly would explain the damage shown in Steve's last picture of the ruptured vertical tube damage near the bottom. I'll have to scan some of the info from Blanton's Builders manual. He offers several good insights on the SWP airplanes.

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