What indicators show that the landing gear is down and locked?

• A. A red 'GEAR UP' light.
• B. A green DOWN-LOCKED light or similar indication on the gear selector panel and uplock/downlock sensors.
• C. A noise from the cockpit.
• D. An amber warning light.

Answer: (B)

When the landing gear is fully down and locked, the cockpit shows a positive indication that combines both the movement into the down position and the successful locking of the gear. The green DOWN-LOCKED light (or an equivalent indication) on the gear selector panel is driven by uplock and downlock sensors that confirm the gear is not only extended but also locked in place. This provides a reliable, visible confirmation to the pilot that the gear is safe for landing.

Why this is the best indicator: the system uses dedicated sensors to verify the gear has reached the down position and that the locking mechanism has engaged. This is more reliable than hearing a noise or seeing an amber warning, which could occur for other reasons or indicate a fault. A red light indicating the gear is up would tell you the opposite state, not that the gear is down and locked.