Under what conditions do HYD 1B and HYD 2B automatically activate?

The scenario described in the correct choice pertains to the operational conditions of the hydraulic systems in an aircraft. In this case, the automatic activation of HYD 1B and HYD 2B occurs when the flaps are extended beyond 0 degrees, which indicates that the aircraft is preparing for takeoff or landing, situations that typically require enhanced hydraulic support for controlling various systems such as the landing gear and flaps themselves.

The additional conditions mentioned state that any generator must be operating and that the respective hydraulic buses are powered. This is crucial as hydraulic systems rely on electrical power to function. If generators are not operating or the buses are not powered, the hydraulic systems cannot receive the necessary operating force, rendering them inactive despite the flap position.

Understanding the correct activation conditions is vital for pilots and maintenance personnel, as it directly impacts the aircraft's performance during critical phases of flight, particularly during takeoff and landing. Being familiar with these conditions ensures that personnel can effectively monitor system statuses and intervene if necessary for safety.