HU55108-4 is a precision-manufactured aerospace engine high-pressure compressor (HPC) labyrinth seal segment, compliant with AS9100D quality standards and FAA/EASA regulations, designed for CFM56 and IAE V2500 turbofan engines. It forms a non-contact labyrinth seal between the HPC rotor and the engine casing, minimizing the leakage of high-pressure compressed air between HPC stages, which is critical for maintaining the compressor's compression efficiency, reducing energy loss, and ensuring stable air supply for the engine's combustion system.

Made from a wear-resistant, heat-resistant nickel-based superalloy, it withstands operating temperatures up to 610°C and the impact of high-speed air flow. Weighing 0.22kg with a precision-machined tooth profile, it allows for quick replacement and gap adjustment during HPC MRO overhauls. FAA Part 25 certified, it is a key component for HPC performance and engine operational stability.