956A1618 is a precision aviation maintenance tool compliant with AS9100D standards and FAA/EASA regulations, dedicated to aircraft hydraulic system MRO and ground support operations. Crafted from high-strength wear-resistant alloy steel, it resists extreme temperatures from -50℃ to 125℃, mechanical abrasion and aviation hydraulic fluid erosion for stable, durable performance during frequent use. Specialized in disassembling and installing hydraulic system cylinder sleeves and valve cores, it features calibrated precision spanners with tight tolerances to avoid component damage, critical for ensuring hydraulic seal performance and stable pressure output. Its compact, ergonomic design fits confined hydraulic bays, works with mainstream hydraulic fixtures, streamlines servicing workflows, cuts maintenance downtime, safeguards hydraulic system integrity, and is an indispensable tool for reliable aircraft operation and flight safety.