If the ENG 2 FIRE switch is released out, what happens?

When the ENG 2 FIRE switch is released out, one of the immediate actions is that the Power Transfer Unit (PTU) activates to pressurize the yellow hydraulic system. The PTU is designed to provide hydraulic power in the event that one of the engines fails or is shut down for any reason, such as a fire. Releasing the ENG 2 FIRE switch has implications for the aircraft’s hydraulic systems, ensuring that sufficient hydraulic pressure remains available to essential systems and components.

In this context, the yellow hydraulic system is crucial for various aircraft operations, and the activation of the PTU helps maintain its functionality in such scenarios. This functionality is vital for ensuring that critical systems remain operational even if one engine is no longer available, which is particularly important during emergencies.

The other options do not accurately describe the system's response when the ENG 2 FIRE switch is released, as they either imply a loss of functionality or incorrect operation concerning the yellow hydraulic system's pressurization.