lowandslow1(at)hotmail.co Guest
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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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