856A1815G05 is a high-performance aircraft hydraulic pressure relief valve tester, compliant with AS9100D aerospace standards and FAA AC 43.13-2 guidelines, designed for testing relief valves in Boeing 787 and Airbus A350 hydraulic systems.

Crafted from aerospace-grade stainless steel with a passivated finish, it endures hydraulic fluid temperatures up to 140°C and pressure ratings of 4,000 psi, ensuring leak-proof operation in MRO environments. Equipped with a digital pressure sensor (±0.2% accuracy) and adjustable flow control, it measures relief valve response from 0.1 to 40 L/min. Its lightweight design (2.9 kg) and ergonomic handle enable easy use in tight aircraft bays, making it a key tool for technicians to verify valve functionality, prevent hydraulic system overpressure, and ensure aircraft operational safety.