At what psi does the overpressurization valve open?

The overpressurization valve in the T-6A system is specifically designed to maintain safe operational pressures within the fuel system. It functions as a safety mechanism, opening at a pressure of 4.0 psi to prevent excessive pressure buildup, which could lead to damage or failure of the fuel system components.

When the pressure in the fuel system exceeds this specified threshold of 4.0 psi, the valve opens to release excess pressure, ensuring that the system remains within safe operational limits. This is crucial for maintaining integrity and functionality, especially during high-stress situations such as changes in altitude or swift maneuvers.

Understanding this specific pressure point is essential for pilots and maintenance personnel, as it influences safety protocols and operational procedures. Ensuring that the fuel system is functioning correctly and that the overpressurization valve is within its specifications is critical for the overall safety of the aircraft.