HU55281-4 is a precision-manufactured aerospace engine low-pressure compressor (LPC) seal ring, compliant with AS9100D quality standards and FAA/EASA regulations, designed for CFM56 and IAE V2500 turbofan engines. It creates a tight seal between the LPC rotor and engine casing, minimizing the leakage of compressed air between LPC stages, which is critical for maintaining the compressor's compression ratio, reducing energy waste, and ensuring the stable air supply required for the engine's combustion system.

Made from a wear-resistant, corrosion-resistant nickel-based alloy, it can endure operating temperatures up to 480°C and the friction of high-speed rotating components. Weighing 0.19kg with a precision-machined sealing surface, it allows for quick replacement and gap inspection during LPC MRO overhauls. FAA Part 25 certified, it is a key component for LPC performance and engine operational efficiency.