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Gary, corrosion happens to all airplanes, big and small, in one form or another. The first thing you see is whats called the corrosion by-products. Either the darkish surface or the whitish dusty appearance. Discoloration of the material happens first. Then, as the material (aluminum) continues to decompose it begins to revert back to it's basic elements and oxides. Aluminum starts to turn into a white powder. Underneath the white powder you will see that you have a loss of material, and a loss of skin thickness. Once the old paint and by-products are removed by either chemical or mechanical means and you are left with the bare alum you must then inspect to see how deep the corrosion (pitting at that point) went. The FAA has published an entire advisory circular on corrosion control and treatment. Also AC 43.13 also covers this, and it allows a certain loss of material and still is considered structurally sound. The remaining structure must then be etched, treated and painted to prevent further loss or corrosion. You just have to look and see if it looks like there is material loss. You can see it even through epoxy primer if you look long and hard enough, using a good light. Jan Z Fresno CA (with the 415G for sale) ==^================================================================ This email was sent to: [EMAIL PROTECTED] EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Sid.bAhN69 Or send an email to: [EMAIL PROTECTED] T O P I C A -- Register now to manage your mail! http://www.topica.com/partner/tag02/register ==^================================================================
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