98V27508797002 is a precision aviation maintenance tool compliant with AS9100D quality standards and FAA/EASA regulations, dedicated to aircraft engine fuel, hydraulic and pneumatic system maintenance.It functions as a high-precision tube fitting gauge, specialized in inspecting the integrity of tube ends and fittings during MRO assembly and maintenance. It accurately verifies flare angles, fitting dimensions and sealing surfaces against strict aviation tolerances, detects deformation, wear or defective processing, ensures leak-proof connections of high-pressure tubes, prevents fluid leakage and system pressure loss under extreme flight conditions, and avoids potential safety hazards caused by loose or faulty fittings.Made of high-strength wear-resistant stainless steel, it resists corrosion and mechanical wear, working stably at -55℃ to 280℃. Weighing 0.35kg, it features calibrated measuring surfaces and clear gauging references, enabling efficient, reliable inspection with consistent results. It is a critical tool to guarantee tube fitting integrity and overall engine system operational safety and reliability.