Which system provides a warning to pilots if the landing gear is not down?

• A. Warning
• B. Indicator
• C. Display
• D. Alert

Answer: (A)

The key idea is how pilots are alerted when the landing gear isn’t in the required position for landing. The system designed for this is the landing gear warning system. It continuously monitors the gear’s position and the aircraft’s configuration, and if the gear is not down and locked when it should be (such as on approach), it triggers an audible warning and a visual cue to grab the crew’s attention. An indicator merely shows gear position, and a display presents information, but neither by itself delivers the dedicated warning that prompts action. An alert is a general term for notifications, but the established function here is specifically the warning system that provides a warning. So the correct concept is the warning system.