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My confusion arises from thinking technical stuff comes through only on this list, whereas in reality there's as much again on the "social" list. One recent post concerned main spar corrosion and went into a little detail on the symptoms and causes. When we got #4019 stripped out I found what I thought was inter-granular corrosion on the spar cap front face immediately in front of the four fuselage-to-main-spar bolt holes. It looked like exfoliation and we guessed it may have started as a result of dissimilar metal interaction between the steel bolts and the spar cap. A thorough visual inspection of the holes however showed them to be round, shiny and corrosion free. We linished the exfoliation off the front of the cap and ran into clean metal at a depth of about 10 thou. We developed the area but could find no more damage so we acid washed it, hit it with alordyne and called it good. Close inspection showed that a router of some description had been used to diminish the depth of the top web forward face inboard of the fuselage attachment points and the resultant rough finish, together with vibration jitter from fuselage/spar web interference, had encouraged corrosion to start. This is, as always, just my humble opinion and I thought I would ask whether anyone on this board had experienced a similar problem. At first glance we thought we had a scrap center-section, on reflection and with a minor amount of effort we found we didn't. Jim Read --------------------------------- to unsubscribe send mailto:[EMAIL PROTECTED] ==^================================================================ EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Sid.bAhN69 Or send an email To: [EMAIL PROTECTED] This email was sent to: [EMAIL PROTECTED] T O P I C A -- Learn More. Surf Less. Newsletters, Tips and Discussions on Topics You Choose. http://www.topica.com/partner/tag01 ==^================================================================
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