At what level does the hydraulic reservoir need to be refilled?

The hydraulic reservoir typically needs to be refilled when the fluid level reaches 0.8 gallons. Maintaining the hydraulic fluid at this level is essential for ensuring the proper functioning of the hydraulic system, as it allows for adequate pressure and fluid dynamics necessary for system operations. When the fluid level drops below this threshold, the performance of the hydraulic components may become compromised, potentially leading to inadequate operation of critical systems such as landing gear, flaps, and braking systems. Keeping the fluid at around 0.8 gallons helps to ensure the system stays within its optimal operating conditions, thereby enhancing reliability and safety.