Which components verify that the landing gear is down and locked?

• A. Tire pressure sensors.
• B. Altitude sensors.
• C. Uplock sensors and downlock sensors.
• D. Wheel speed sensors.

Answer: (C)

Uplock sensors and downlock sensors are the parts that confirm the gear is down and locked. When the gear extends, the downlock pins must engage to physically lock the gear in the fully extended position. At the same time, the uplocks must be in the released state so the gear can stay down without lifting back up. Sensors monitor these locking pins and feed the cockpit indication system, so a green light or a similar confirmation tells the pilot the gear is down and locked. If either lock isn’t in the correct position, the system can warn you, signaling that the gear may not be safely deployed.

Tire pressure sensors, altitude sensors, and wheel speed sensors don’t indicate gear position. Tire pressure checks tire integrity, altitude sensors track altitude, and wheel speed sensors monitor rotation for braking and vehicle speed, not whether the landing gear is properly extended and locked.