When should the separation valve be opened during flight?

The separation valve should be opened under normal operating conditions during flight to ensure the proper management of the aircraft's performance and systems. This action allows for the appropriate distribution of air and pressure within the aircraft, facilitating optimal functionality of various systems, including the engines and pressurization.

Opening the separation valve under normal operating conditions helps maintain necessary pressure levels and can improve engine efficiency and capability. It is a standard procedure that aligns with the aircraft's design and operational guidelines, enabling the aircraft to perform effectively throughout its mission profile.

Other scenarios listed, such as before takeoff, during heavy turbulence, or when landing, do not represent standard operating practices for the separation valve and can lead to decreased performance or non-compliance with safety protocols. Understanding when to operate this valve is crucial for maintaining aircraft integrity and ensuring safe flight operations.