Landing gear doors are actuated by:

• A. Electrically actuated
• B. Pneumatically actuated
• C. Manually opened from cockpit
• D. Hydraulically or mechanically actuated

Answer: (D)

Landing gear doors need to move with enough force and reliability to reliably open and close during gear operations. Hydraulic systems provide that high force in a compact package and are widely used to actuate gear doors, often with direct mechanical linkages that tie door movement to the gear’s retraction/extension. Electric actuation exists in some designs, but is less common for doors due to power and complexity considerations, while pneumatic actuation can be less consistent under varying flight conditions. Manually opening doors from the cockpit isn’t practical in flight. Because of these factors, doors are typically actuated hydraulically or mechanically, making that option the best choice.