Describe the normal landing gear extension mode: What does the gear lever down do?

Describe the normal landing gear extension mode: What does the gear lever down do?

• A. Releases hydraulic pressure for the uplocks and retraction actuators
• B. Pumps hydraulic pressure
• C. Locks uplocks closed
• D. Opens the gear doors

Answer: (A)

When the landing gear lever is placed in the down position, the system releases hydraulic pressure on the retract side—specifically the uplocks and the retraction actuators. This release frees the uplocks from their locked position and removes the upward force from the retract actuators, allowing the gear to move into the lowered, extended position under its own weight and the guidance of the doors and linkages. Once fully extended, the uplocks re-engage to lock the gear down. The doors opening is part of the sequence that accompanies extension, but the immediate, primary action of moving the lever down is to relieve pressure on the uplocks and retraction actuators so the gear can extend.

When the landing gear lever is placed in the down position, the system releases hydraulic pressure on the retract side—specifically the uplocks and the retraction actuators. This release frees the uplocks from their locked position and removes the upward force from the retract actuators, allowing the gear to move into the lowered, extended position under its own weight and the guidance of the doors and linkages. Once fully extended, the uplocks re-engage to lock the gear down. The doors opening is part of the sequence that accompanies extension, but the immediate, primary action of moving the lever down is to relieve pressure on the uplocks and retraction actuators so the gear can extend.