856A2645G05 is a precision-manufactured aerospace engine low-pressure compressor (LPC) rotor seal ring, compliant with AS9100D quality standards and FAA/EASA regulations, designed for large commercial turbofan engines. It seals the gap between the LPC rotor and the engine static casing, reducing the radial leakage of the incoming air during the initial compression stage, which is critical for maintaining the air pressure of the LPC, optimizing the pre-compression effect for the subsequent HPC, and avoiding the reduction of the engine's overall compression efficiency and thrust output.

Made from wear-resistant, corrosion-resistant nickel-based superalloy, it withstands operating temperatures up to 760°C and continuous scouring from high-speed air flow. Weighing 0.07kg with a precision-machined sealing surface, it allows for fast installation and tightness check during LPC MRO overhauls. FAA Part 25 certified, it is a key component for LPC operational reliability.