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Reply to: nacra 5.8 broken bridle foil

[quote=Edchris177]It looks like that fitting failed as a result of crevice corrosion & propagation, you can see corrosion around the spot that failed, leading me to believe it was a hidden problem that could have been there for years. In the aviation inspection world finding cracks before they lead to component failure literally saves lives. Does anyone use dye penetrate testing, (DPT) a form of non destructive testing to inspect critical parts, & hopefully avoid a catastrophic failure? Essentially you spray the DP on suspect hi stress areas, leave it for a few seconds, then wipe clean. Next shine a "black light" on the area, or use developer, depending on the kit. Hairline cracks that cannot be seen with the naked eye show up like a lightning bolt. We used a product I believe was called Magnaflux. Others are available at any hot rodding shop or engine rebuilder. They are cheap & easy to use. Avoid aviation specific products, they will cost 10X what an automotive application will. Another free way is to use magnification with a visual inspection. Buy a cheap jewelers loupe,(an 8X version can be had for $2 at an auto parts store)& go over each part during the off season, make sure you have strong lighting. In a pinch use your binoculars. Turn them around & look through th objective lens. You have to move the ocular lens VERY close to the part, but it will magnify to the same level as the power of the binocular. This won't work to inspect the inside of a radius, as you can't get close enough, but is wonderful for items you can get close to. <!-- editby --><em>edited by: Edchris177, Jul 20, 2010 - 01:20 PM</em><!-- end editby --> [/quote]

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