856A3761G01 is a precision aerospace fixture compliant with AS9100D quality standards and FAA/EASA regulations, dedicated to aircraft engine combustion chamber maintenance. It serves as a combustion chamber segment positioning and assembly fixture for MRO disassembly, repair and reassembly. It ensures precise segment alignment, fit clearance and concentricity, maintains a sealed and smooth combustion airflow path, prevents high-temperature gas leakage and local thermal stress concentration, avoids chamber deformation or cracking, and guarantees efficient, stable combustion under all engine operating conditions. Made of high-strength heat-resistant alloy steel with anti-corrosion treatment, it resists extreme heat and mechanical impact, working stably at -55℃ to 520℃. Weighing 2.6kg, it has calibrated locating benchmarks, secure locking mechanisms and adjustable clamps for standardized, accurate operation. It is a vital tool to ensure combustion chamber integrity and overall engine power output and operational safety.