----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- >>>However, I am finding white >powder between all the riveted seams.<<<<
Paul, removing the rivets on these seams is a good idea. Sometimes the rivets themselves are badly corroded and heads pop off under stress. >>>Will it >soften it enough to require jigging the wing????<<< No, the wing is sufficiently strong without the rear brace to do this work. Be very careful and avoid elongating the rivet holes, also, be +sure+ that you haven't lost a lot of material around rivet holes to the dreaded white powder. Be sure to closely inspect your aileron attachment fittings. These are steel plates sandwiched onto the aluminum and create dissimilar metal corrosion! >>>I am also fishing for recommendations for what brand of corrosion >treatment to use upon assembly.<<< It's important to completely stop the ionization and oxidation process. Here's something to think about. Scrub the disassembled structure using a correct Scotchbrite pad and aluminum chemical cleaner, spray on a one-step self-etching primer on the cleaned aluminum, assemble and then cover with a coat of paint compatible with the Stits glue. Maybe call the manufacturer re: this. Good luck, let us know how it works out for you. And, as always, I'm not an A&P and your mileage may vary. Jim -----Original Message----- From: Paul Anton <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>; ERCOUPE <[email protected]> Date: Saturday, August 12, 2000 12:26 PM Subject: [COUPERS] Wing query: >----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- >Has anyone disassembled a rear beam assembly? > >I am getting a set of wings ready for recover. One of the >wings has corrosion in the rear beam assembly. The >corrosion at this time is surface. > >The rear beam is made up of a large "J" shaped piece that the >ribs are riveted to. This is reinforced with a "U" shaped piece that >has large lightening holes pressed into it. The corrosion primarily >involves the "U" shaped piece with the lightening holes, and the >seams where it is riveted to the "J" shaped piece. > >I am considering removing the "U" shaped piece in order to treat >all the corrosion. This will soften the structure somewhat. > >I "THINK" that the wing will be sufficiently stiff due to the fact that >the ribs will still be attached to the large "J" shaped piece. Also, since >the "U" shaped piece will be put back using all the original rivet >holes, and misalignment will be removed when this piece is put >back. > >Since the fabric is cemented to >the structure at the rear beam, what ever is used cannot damage the >fabric bond to the structure. > >Unfortunately, this area is one that is not visible until the wing is >taken apart. In this case, the pitot and static lines exiting the wing >allowed an opening for mud and moisture to enter. However, there >is nowhere for the moisture to go once it is there and the corrosion >resulted. A few more years and the rear beam would have been >unserviceable. There are no repair parts listed for the beam, just >the entire assembly for over $900. > >If you have taken this rear beam apart, I would surely like to hear >about your experience. > >Thanks > >Paul >N2273H > > >__________________________________________________ >To unsubscribe from this list please send mailto:[EMAIL PROTECTED] >___________________________________________________________ >T O P I C A The Email You Want. http://www.topica.com/t/16 >Newsletters, Tips and Discussions on Your Favorite Topics --------------------------------- to unsubscribe send mailto:[EMAIL PROTECTED] ___________________________________________________________ T O P I C A The Email You Want. http://www.topica.com/t/16 Newsletters, Tips and Discussions on Your Favorite Topics
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