856A1411G03 is a precision aerospace fixture compliant with AS9100D quality standards and FAA/EASA regulations, dedicated to aircraft engine accessory gearbox maintenance.It serves as an accessory gearbox positioning and assembly fixture, specialized in accurate fixing and alignment of gearbox components during MRO disassembly, repair and reassembly. It ensures strict concentricity of gears, shafts and bearings, precise axial clearance and positioning tolerances, eliminates installation deviation and misalignment, prevents gear meshing failure, abnormal wear and vibration, and ensures stable power transmission to engine accessories like pumps and generators.Made of high-strength heat-resistant alloy steel, it resists high temperature and mechanical impact, working stably at -55℃ to 320℃. Weighing 1.8kg, it features secure locking mechanisms and calibrated locating benchmarks, enabling efficient, standardized assembly with consistent accuracy. It is a vital tool to guarantee gearbox integrity and overall engine accessory system operational safety and reliability.