What happens to the hydraulic system when only one generator is operating?

When only one generator is operating, the hydraulic system prioritizes functionality to ensure safety and essential operations are maintained. This means that only the essential systems receive hydraulic pressure. This is important during configurations with limited power availability, as hydraulic systems often rely on electrical power from generators to operate.

In this scenario, non-essential hydraulic systems may be temporarily inoperative to conserve resources and maintain the integrity of the critical operations of the aircraft. The decision to supply hydraulic pressure selectively helps to prioritize vital systems that are necessary for safe operation. The other options reflect situations that would not accurately describe the prioritization and management of hydraulic power under these constraints.