lowandslow1(at)hotmail.co
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 Posted: Sun Dec 20, 2009 12:00 pm Post subject: Dye Penatrant and Magnaflux |
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Both processes will require all paint/powder coating removed from the item being checked and free from grease C oil C etc. Do not use a wire brush or anything harder than the material being checked (no metal scrapers) to clean any of the parts as the scratches from cleaning can give an erroneous indication of a crack. Plastic or brass brush(sometimes) and/or Plexiglas scraper should be used. And forget bead blasting as that can move material over the crack C plastic or walnut shells is acceptable.
Magnaflux requires an electric current to flow through the ferrous material C ie crankshaft C bolt C connecting rod C and the change in polarity that occurs at a crack is shown when a fluid with a marker dye(fluorescent) is flowed over the part. Unless the tubing is removed from the aircraft I don't think that you'll be able to use Magnaflux. An engine mount could be tested C if the operator does it correctly.
Dye Penetrate inspection is easier to be done in the field. But I would find a mechanic in your area who does it routinely. It is very specific in the application and use of the developer to expose the crack. Once again you can get false positives and or not see the actual crack if the operator does not have experience in what to look for. We regularly have to do borescope compressor/power turbine inspections and I don't do it myself. I have the same guy look into the engines C cause he knows what to look for. We also have a biased input into what we want to see and that can influence the outcome.
Andy
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