In aircraft maintenance, non-scheduled engine disassembly and maintenance is the most waste of time and cost, but it is often an inevitable maintenance process. Even modern turbine engines, designed/built to the strictest standards, cannot be guaranteed from damage in use. One of the main reasons for the irregular disassembly of the engine is the damage to the blades of the high pressure compressor (HPC). For a long time, when an aircraft engine is damaged by external objects, it must be removed from the aircraft and taken apart for maintenance. After the damaged blades are replaced or repaired, they are put back together and transported to the test room (or test bed) for test run. This kind of maintenance will cost a lot of manpower, man-hours and materials, resulting in an increase in maintenance costs. In recent years, some aviation industry departments in developed countries have successfully developed a grinding endoscope hole detector system with dual functions of inspection and maintenance

The endoscope is similar, except that a grinding head socket is installed at the most front end of the rigid endoscope tube. Different grinding heads can be installed according to requirements, and appropriate working angles can be adjusted. The endoscope has a side lens, which can be used for general detection, and also allows the inspector to monitor the grinding head directly by naked eye or electronic imaging.

In the grinding endoscope hole detector, there is a tiny motor, which can drive the grinding head with thousands of revolutions per minute, and adjust the appropriate rotation speed according to the actual needs. It is equipped with a variety of different length, replaceable grinding head, can be used for cutting, grinding, polishing and polishing and other maintenance work, so that the entire repair work can be completed without dismantling any external components of the engine, thereby significantly reducing the maintenance time and cost. On the whole, this equipment has the following advantages: excellent image quality and ideal viewing Angle; Operational precision; Can easily replace different grinding head, improve the flexibility of maintenance; It can easily measure and judge the damage condition of the machine parts and the result of repairing and grinding. The rotation speed and observation position of grinding head can be adjusted according to the length of grinding head used. Can directly use the naked eye or electronic image system to detect and monitor the grinding work; Simple design, small size, light weight, easy to carry.