5731 is a high-reliability aviation maintenance tool compliant with AS9100D standards and FAA/EASA regulations, dedicated to aircraft fuel system valve disassembly and calibration during ground MRO operations. Forged from high-strength anti-corrosion alloy steel with fuel-resistant plating, it withstands -55℃ to 180℃, resisting jet fuel erosion and mechanical vibration for stable, long-lasting performance. Its precision-machined torque heads and alignment pins enable damage-free handling of valves, preventing fuel leakage risks that threaten flight safety. Compact and ergonomic, it fits confined fuel system compartments, streamlines maintenance workflows, cuts ground downtime, and serves as an indispensable tool for aircraft operational reliability.