What is the position of the ISOL valve when the bleed valve selector is set to AUTO and the valve is selected to OPEN?

The correct position of the ISOL valve when the bleed valve selector is set to AUTO and the valve is selected to OPEN is the last position, which is typically closed. In an AUTO setting, the system is designed to automatically control the operation of the valves based on the aircraft's operational requirements.

When the bleed valve selector is set to AUTO, it generally means that the system will manage the valve positions for optimal performance and safety. Even if the control indicates that the valve should be opened, the actual position can remain as the last commanded setting, which may be closed if previous operations resulted in that state. This design aims to prevent any unintended activation of the system when in AUTO mode, ensuring that the aircraft operates safely and according to established protocols.

This situation occurs due to several safety checks and the need to maintain system integrity, allowing for operational reliability in different flight conditions and scenarios. Understanding how the systems interact in AUTO mode is critical for effective decision-making in cockpit operations.