Which system component generally is NOT dependent on hydraulic pressure?

The avionics system is generally not dependent on hydraulic pressure, which makes it the correct choice in this scenario. Avionics encompasses the electronic systems used for communication, navigation, flight control, and monitoring within an aircraft. These systems typically rely on electrical power rather than hydraulic pressure for operation.

In contrast, components such as flaps, landing gear, and speed brakes commonly use hydraulic systems to function. Flaps are extended and retracted through hydraulic actuators, which help adjust the airflow over the wings for better lift during takeoff and landing. Similarly, the landing gear uses hydraulic pressure to deploy and retract, ensuring safe landings and takeoffs. Speed brakes also rely on hydraulic systems to extend and retract, which aids in reducing the aircraft’s speed during descent and landing.

Understanding the operational requirements of these components against how they are powered is crucial for recognizing the role and independence of various systems within the aircraft.