Which annunciator alerts the pilot to low hydraulic fluid levels in the system?

The annunciator that alerts the pilot to low hydraulic fluid levels in the system is the one labeled "HYD FL LO." This indicator serves a crucial purpose in ensuring the safety and operational efficiency of the aircraft by providing timely alerts regarding the hydraulic system's condition.

When the hydraulic fluid levels drop below a certain threshold, the "HYD FL LO" light illuminates, notifying the pilot that there may be insufficient hydraulic fluid to operate the flight controls effectively. Maintaining adequate hydraulic fluid levels is vital for the proper functioning of various systems, including the landing gear, brakes, and flight control surfaces.

Understanding this indicator helps pilots recognize issues early, allowing them to take appropriate actions, such as checking hydraulic fluid levels, performing system checks, or following emergency procedures if necessary. This awareness is essential for ensuring both safety and the proper functioning of the aircraft’s systems during flight.