856A6629G03 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 gear installation and positioning fixture, specialized in accurate assembly of gears during MRO disassembly, repair and reassembly. It ensures precise gear meshing clearance and axial alignment, maintains stable power transmission efficiency, eliminates abnormal wear and noise caused by installation deviation, prevents gear tooth breakage under variable load conditions, and safeguards reliable operation of the gearbox-driven engine systems.Made of high-strength alloy steel with anti-wear treatment, it resists mechanical impact and corrosion, working stably at -55℃ to 300℃. Weighing 1.8kg, it features secure locking mechanisms, calibrated locating benchmarks and adjustable clamps, enabling efficient standardized operation with consistent accuracy. It is a vital tool to guarantee gearbox integrity and overall engine accessory system reliability.