In which switch position is the XBLEED valve open?

The XBLEED valve, or cross-bleed valve, is an important component in the pneumatic system of the Dassault Falcon 7X. When the switch is in the ON position, the XBLEED valve is open, allowing for the transfer of bleed air between the left and right pneumatic systems. This configuration is crucial for engine-start procedures and for providing bleed air for air conditioning and other systems when needed.

The ON position facilitates the cross-bleed operation, which is essential when one engine is needed to supply bleed air to start another engine or for other pneumatic applications. The AUTO position operates the valve based on automated logic depending on system demands, while OFF and SERVICE positions would either isolate the valve or place it in a service mode, not allowing for cross-bleed operations. Understanding how and when the XBLEED valve operates specifies the necessary procedures for efficient aircraft management and helps maintain operational readiness.