Soar to New Heights with the 2025 Commercial Pilot License (CPL) Practice Exam – Ready for Takeoff!

The correct answer is hydraulic power pack pressure, as this mechanism is commonly used in modern aircraft to ensure that the landing gear remains securely in the UP position during flight. When the landing gear is retracted, hydraulic pressure is applied to lock the gear in place, preventing it from inadvertently coming down. This system is critical for maintaining aerodynamic efficiency and safety during flight.

In contrast to hydraulic power, other options do not typically provide the necessary reliability and effectiveness for landing gear retention. Spring tension, while it may assist in certain mechanisms, lacks the force and control provided by hydraulic systems and is more commonly used for other components. Mechanical latches can provide a secondary method of securing the gear but are often actuated or engaged through hydraulic systems in larger aircraft. Gravity, while a natural force acting on the gears, is not a method for ensuring they stay in the UP position; rather, gravity is what causes the gears to deploy when not held in place. Hence, hydraulic power is the most reliable method for maintaining the landing gear in the UP position.