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

The most common sources of power used to extend and retract landing gear are hydraulic pressure and electric motors. Hydraulic systems provide the necessary force to move the landing gear components smoothly and effectively, allowing for quick and reliable operation. This is critical during takeoff and landing when swift deployment and retraction of the gear are essential for safety and performance.

Electric motors are also widely used, particularly in smaller and more modern aircraft. They can operate the landing gear systems efficiently and often integrate with automated systems for added reliability. The use of electric motors allows for less maintenance compared to hydraulic systems and can reduce the overall weight of the aircraft.

Other options include sources of power that do not typically provide the combination of reliability, speed, and control required for modern landing gear operations. For instance, manual cranks and gears may be used in some older aircraft, but they are not common in contemporary designs due to the labor-intensive operation and slower response times. Pneumatic systems are less common for landing gear actuation compared to hydraulic systems, as pneumatic pressure is not as effective in the precise control required for landing gear mechanisms. Lastly, gravity and springs may assist in the retraction or extension of landing gear but do not act as primary power sources in the same way as hydraulics and