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Old 28th Dec 2010, 17:06
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Turbine D
 
Join Date: Dec 2010
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Annex14

Look at the disc fracture face photo, in the upper left of the disc, just below the dovetail serrations you will note a dark area which is the forward face of the disc. It is this that I wonder about compared to the lighter metallic surface of the rear surface of the disc that is more clearly evident. Is it dark because of the effect of fire/temperature? Or is it dark because of the lighting shadow?

Sometimes these surfaces can tell you somethings relative to conditions that were happening at the time.
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