Endoscopy has important significance and value for both safety and benefit. First, it is intuitive, accurate, simple and easy to operate, and can detect the damage of engine internal components as soon as possible, which is greatly conducive to eliminating the potential safety hazards in the budding stage. Second, the inspection of endoscope hole detector avoids the cost of decommissioning engine and corresponding engine dismantling and transportation, as well as the unnecessary loss of aircraft shutdown, thus saving the maintenance cost.

Endoscope products are used for the regular inspection of aircraft turbine, blade, engine, welding seam surface, duct surface, combustion chamber interior or body inspection, as well as the research, development and manufacture of rocket engine. In aircraft maintenance, endoscope is called "endoscope hole detector", which is one of the five tools for aircraft daily maintenance and routine inspection. As the only way to understand the internal condition of an engine without decomposing it during route maintenance.

The history of endoscopes has gone from rigid optical endoscopes to fiber-optic endoscopes to electronic endoscopes. With the rapid development of semiconductor and computer technology, electronic endoscope was first invented by americans in 1983 and applied in aviation, which is regarded as the third milestone in the development history of endoscope. Instead of transmitting images through an optical lens or fiber optic fiber, the endoscope pore-finder converts light energy into electricity using a CCD, an optoelectronic coupling device at the endoscope's tip, called a microcamera.