In theory, borescopes are straightforward instruments. Using a combination of lenses, an eyepiece at one end, and some form of tube that can be inserted into tight spaces, "Borescopes allow users to look inside small, deep, or complex parts and assemblies without the need for costly and time-consuming engine tear down or other destructive testing," said Doug Kindred, president of Gradient Lens (www.gra-dientlens.com). "They can allow visual inspection of virtually any area not visible with the naked eye." In reality, the world of borescopes is more complicated. The reason is due to modern technology. In addition to the traditional rigid-tubed borescopes in use for decades, aviation technicians can now choose between sophisticated fiberscopes and videoscopes.
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