What visual cue in the cockpit confirms the landing gear is down and locked?

• A. A blue cabin alert light.
• B. A red nose gear warning light.
• C. A white strobe on the gear door.
• D. A green down-and-locked indication and corresponding gear-position switches or indicators.

Answer: (D)

The key concept is that a clear cockpit indication confirms both the gear is extended and the latches are locked. The green color used for a down-and-locked indication, combined with the gear-position switches or indicators, provides a direct, unambiguous signal that the gear is fully down and securely locked. This is what pilots rely on during approach and landing to verify the gear status without doubt.

A green down-and-locked signal is standard because green is the visual cue for a safe, confirmed condition, and the associated switches or indicators give redundancy and a definite status readout. In contrast, a blue cabin alert light is typically used for non-gear cabin warnings, not the actual gear status. A red nose gear warning light signals an abnormal condition or fault, not a confirmed safe state. A white strobe on the gear door is an exterior lighting feature for visibility and does not convey cockpit gear status.