What is the function of the FCS NORM and FCS STBY buttons on the overhead panel?

The FCS NORM and FCS STBY buttons on the overhead panel are integral to managing the flight control systems of the Dassault Falcon 7X. When these buttons are engaged, they facilitate the resetting and switching of the Flight Control Computers (FCS) between normal and standby modes.

The FCS NORM button is used to return the flight control system to its normal operational status, allowing for the standard control laws to be applied, which is crucial for normal flying conditions. Conversely, the FCS STBY button puts the system into standby mode, which is critical in case of a failure in the primary flight control systems. This allows the pilots to maintain aircraft control with reduced functionality until the issue can be addressed.

This operation is vital for the safety and reliability of flight operations, as it ensures that pilots have the necessary tools to handle any potential failures in the flight control systems. The other options, such as activating emergency brake systems, controlling cabin pressure, or adjusting fuel mixtures, do not pertain to the flight control functions and therefore do not represent the purpose of the FCS NORM and FCS STBY buttons.