Retraction and extension are:

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Multiple Choice

Retraction and extension are:

Explanation:
Retraction and extension use an electro-hydraulic system: an electrical signal commands hydraulic pumps and valves, and hydraulic pressure moves the landing gear actuators to raise or lower the gear. The hydraulic system provides the necessary force and smooth, precise control for handling the gear and associated doors, while the electrical control enables proper sequencing, interlocks, and reliability. Pneumatic systems lack the force and fine control needed for this load, and mechanical actuation would be impractical for automatic gear operation.

Retraction and extension use an electro-hydraulic system: an electrical signal commands hydraulic pumps and valves, and hydraulic pressure moves the landing gear actuators to raise or lower the gear. The hydraulic system provides the necessary force and smooth, precise control for handling the gear and associated doors, while the electrical control enables proper sequencing, interlocks, and reliability. Pneumatic systems lack the force and fine control needed for this load, and mechanical actuation would be impractical for automatic gear operation.

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