With the development of aviation industry, there are higher demands for the flight safety of aero-engines. The core components of aero-engines often operate under high temperature, high pressure, and high rotational speed conditions.To ensure their safe operation, improve safety performance, and avoid major accidents, daily ground inspection, maintenance, and fault repair are essential. Borescope inspection technology is one of the important methods for detecting and repairing faults in engine equipment. It is widely used in core precision manufacturing parts or areas that are difficult to disassemble or inspect, enabling rapid fault assessment and improving accuracy and efficiency.
Engine Borescope Inspection
Borescope inspection technology is one of the most commonly used methods for routine inspection of aircraft engines. Engine inspections typically focus on critical areas such as high-pressure turbine rotor blades and guide vanes. These areas are subjected to harsh environments of high pressure, high temperature, and high-speed rotation, leading to accelerated engine aging and potential damage to internal components. For example, when engine parameters are abnormal during flight, personnel need to determine whether the abnormality falls within the normal fault range, and then use borescope technology to inspect the situation, develop corresponding solutions, and focus the inspection on the engine's interior. Generally, unexpected events cause significant damage to the engine, and borescope technology can effectively shorten inspection time and improve inspection efficiency, thus ensuring the normal flight of the aircraft.
High-Pressure Compressor Borescope Inspection
During aircraft operation, some abnormal situations are inevitable, such as foreign object impact in the intake duct or high-pressure compressor surge. In these cases, a rigid endoscope can be used to inspect the internal fault. Rigid endoscopes provide high-precision imaging, high brightness, good durability, and are cost-effective. They can inspect straight pipes, blades, combustion chambers, and other parts. To more accurately detect subtle damage, it is necessary to have a thorough understanding of the relationship and structure of the damaged part in a normal environment when using borescope inspection technology, especially paying attention to the installation of the J-hook anti-movement pin to prevent the pin from falling off during movement. Wear on the engine's high-pressure compressor can reduce the available space, making it difficult to detect damage with a 6mm borescope; a 4mm borescope is recommended. Furthermore, when using this technology, it is essential to inspect from the back of the high-pressure compressor blades to pinpoint the exact location of the damage.
Engine Combustion Chamber Borescope Inspection
The combustion chamber of an aero-engine mainly comprises basic structures such as the casing, flame tube, nozzles, and diffuser. Many parts within the combustion chamber are thin-walled and are prone to overheating, cracking, and burn-through during operation. Therefore, when a fault occurs in the engine's combustion chamber, a borescope is needed for inspection. During the inspection, the main focus is on checking for looseness in the connecting pipe locks and nozzle head nuts, as well as examining the structural shape of the nozzle fuel outlet to see if any obstruction has caused blade damage.
Borescope inspection technology, as one of the most widely used technologies in aero-engine maintenance in China, has significantly improved the efficiency of daily maintenance and the level of fault detection and repair of aero-engines. Borescope inspection technology is a revolution in aero-engine maintenance and is one of the main methods of non-destructive testing for aero-engines today. With the continuous development and application of this technology, the quality of aero-engine maintenance and repair has been significantly improved. Aero-engine maintenance personnel should enhance their understanding of borescope inspection technology, fully utilize its excellent performance, continuously improve and refine the technology, and proactively identify potential safety hazards in aero-engines, ensuring "early detection and early elimination" to guarantee the quality of aero-engine maintenance and repair, and fundamentally ensure the safety and stability of air travel and protect people's lives and property.
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