What are the two sources of power used to extend and retract landing gear?

The two sources of power commonly used to extend and retract landing gear are electrical and hydraulic systems. This combination is prevalent in modern aircraft due to the advantages each system provides.

Hydraulic systems utilize pressurized fluid to operate the landing gear mechanism. This allows for efficient and forceful movement, enabling quick and reliable operation of heavy components like the landing gear. Hydraulics can provide substantial power in a compact form, making it ideal for the rapid and controlled extension and retraction needed during takeoff and landing phases.

Electrical systems are also vital, particularly in providing control signals and powering the components necessary for landing gear operation. Electric motors are used to drive hydraulic pumps or actuators, enabling precise control over the movements. Additionally, electrical systems often handle the indicators and safety systems related to landing gear position.

Utilizing both electrical and hydraulic power systems together allows for a robust, reliable method of operating landing gear, enhancing overall safety and performance. Other combinations mentioned, like pneumatic and mechanical, may exist but are not typically standard in modern aircraft designs for this specific function.