What happens if hydraulic pressure drops below 1800 psi?

When hydraulic pressure drops below 1800 psi, the pressure display changing from white to amber is the correct response. This color change serves as an immediate visual alert, indicating that the hydraulic system is operating at a diminished capacity and that attention is required.

Typically, systems use color coding to convey status; white usually represents normal operating conditions, while amber indicates a warning or cautionary state, suggesting that the operator should monitor the situation closely but may not require immediate action.

The other options relate to different indicators or alerts for various conditions, but the specific response in this scenario is the change to amber, as it effectively informs the crew of the need to assess the hydraulic system's performance without triggering further alarms or emergency protocols.