AN exceedingly careful control of the surface of aeroengine parts has beyond doubt become an excellent habit both with manufacturers and those who are to use the engine. A crack on a new part, or one which will cause a fatigue failure in workthese are the defects looked for by inspectors during manufacture, overhaul, or repairs. Cracks are very frequent causes of accidents and this fear often underlies the rejection of parts which are only suspect but which might work quite well until normal wear and tear would cause them to exceed permissible tolerances. In many cases, electromagnetic examination or etching reveal defects on the surface of engine parts which cannot be defined in such cases, for the sake of certainty the part is rejected on the ground that it is cracked or made from faulty material.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: May 1, 1939
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